C教材中的源程序代码

教材中的源程序代码

例1.1

# include int main( ) ｛

printf(“How are you!\\n”); printf(“Welcome you!”); return 0; ｝ 例1.2

#include

int main ( ) /*主函数*/ ｛

int a ,b,sum； /*定义变量*/ a=111;b=222; /*为变量赋值*/ sum=a+b; /*求两数之和*/ printf (“sum is: %d”，sum); /*输出sum的值*/ return 0; ｝

例1.3

#include

int sumab (int x, int y); /*函数声明*/ int main ( ) /*主函数*/ {

int a,b,sum; /*定义变量*/ printf(“input a and b:”); /*提示字符串*/

scanf (“%d %d”, &a,&b); /*输入变量a和b的值*/ sum=sumab(a,b); /*调用sumab函数*/ printf(“sum=%d”, sum)； /*输出sum的值*/ return 0; ｝

int sumab (int x, int y) /*定义sumab函数*/ {

int z; z=x+y; return z; }

例2.1

#include int main()

{ int a=200,b=100,c; c=a+b+15;

printf(\ printf(\

printf(\ getch(); return 0; } 例2.2

#include int main()

{ int a,b,c; unsigned d; long e;

scanf(\ printf(\ return 0; } 例2.3

#include int main()

{ float a,b; double x,y;

scanf(\printf(\ return 0; }

例2.4

#include int main()

{ printf(\

printf(\?A\\?\\53\\\ return 0; } 例2.5

#include int main()

{ char c1,c2,c3=‘P’; scanf(\ c2=‘D’;

printf(\

printf(\，%c，%c，%c \\n \ return 0; } 例2.6

#include int main() { char c1,c2;

printf(\请输入2个两个大写英文字符：\ scanf(\printf(\ \

c1=c1+32; c2=c2+32; printf(\ return 0; }

例2.7

#include int main() { int i,j,k; i=6;

j=++i; /*表达式++i的值是7 */ k=i++; /*表达式i++的值是7 */ printf(\，%d，%d\\n \i=-6;

j=--i; /*表达式--i的值是-7 */ k=i--; /*表达式i--的值是-7 */ printf(\，%d，%d\\n \ return 0; }

例2.8

#include int main()

{ int m,n,i,j,k=5; i=（j=6,j++,k+j）;

printf(\，%d \\n\

printf(\，%d，%d，%d \\n \ return 0; }

例2.9

#include int main()

{ int a；float b; double c; char d;

printf(\

printf(\printf(\ return 0; }

例3.1

#include int main()

{ float x, y,c,area;

printf(“输入长和宽：”); scanf(“%f, %f”, &x,&y); c=2*(x+y); area=x*y;

printf(“周长是：%f\\n”, c); printf(“面积是：%f\\n”, area); return 0; ｝ 例3.2

#include int main()

{ int a=65,b=97;

printf(“%d %d\\n”,a,b); printf(“%d,%d\\n”,a,b); printf(“%c,%c\\n”,a,b); printf(“a=%d,b=%d”,a,b); return 0; }

例3.3

#include int main()

{int a,b; char c; float s1,s2,sum; a=65; b=-3;

s1=123.4; s2=56.75; sum=s1+s2; c=?A?;

printf(“%d %c%d %o %f %c %d”,a,a,b,b,sum,c,c); return 0; }

例3.4

#include int main( ) {

printf(“\\“what do you like?\\””); return 0; } 例3.5

#include int main( )

{int i = 56, j=13; float f=12.3456; printf(“i=%-4d”, i); printf(“j=M\\n”,j); printf(“f=%6.2f\\n”,f); return 0; } 例3.6

#include int main() {int a=2,b=8;

float x=123.4567, y=-567.123; char c=?A?;

long d=1234567;

unsigned long e=65535; printf(“==\\n”,a,b); printf(“%-12f,%-12f\\n”,x,y); printf(“%7.2f,%7.2f\\n”,x,y); printf(“%e,.2e\\n”,x,y);

printf(“%c,%d,%o,%x\\n”,c,c,c,c); printf(“%ld,%lo,%lx\\n”,d,d,d); printf(“%u,%o,%x\\n”,e,e,e);

printf(“%s,%5.3s\\n”,“computer”, “computer”); return 0; }

例3.7

# include int main ( ) { int a,b;

scanf(“%d %d”, &a,&b); /*由键盘输入两个数并赋给变量a、b*/ printf(“a+b=%d\\n”,a+b); /*计算总和并输出内容*/ printf(“(a+b)/2=%f \\n”, (float) (a+b)/2.0); /*输出平均值*/ return 0; }

例3.8

#include int main( ) {

char ch;

printf(“Input a character：”);

ch=getchar( ); /*输入一个字符，并赋给变量ch*/ printf(“\\nThe character you input is：”); putchar(ch); return 0; } 例3.9

#include int main( ) { char ch;

printf(“Input a character：”);

ch=getch(); /*输入一个字符，并赋给变量ch*/ printf(“\\nThe character you input is：“);

putchar(ch); return 0; } 例3.10

#include int main() {int k,m,n;

printf(“输入用分表示的时间数:”); scanf(“%d”, &k); m=k/60; n=k`;

printf(“\\n%d分等于%d小时%d分。\\n”, k, m, n); return 0; }

例3.11

#include int main()

{char ch; float s1,s2;

printf(“Input a character:”); ch=getchar(); printf(“\\n%c,%d,%o,%x\\n”,ch,ch,ch,ch); s1=ch*ch; s2=3.14*ch*ch; printf(“%f,%f\\n”,s1,s2); return 0; }

例4.1

# include int main() { int x;

printf(\ scanf(\

if (x>0) printf(\ return 0; }

例4.2

# include int main() { int a ;

printf(\输入一个整数:\ scanf(\if (a%2= =0)

printf(\是偶数\\n\ else

printf(\是奇数\\n\ return 0;

}

例4.3

# include int main() { float x,y;

printf(\ scanf(\ if(x<1) y=x+1;

else if (1<=x && x<2) y=x+2; /*或写成else if (x<2) y=x+2;*/ else y=x+3;

printf(\ return 0; }

例4.4

# include int main() { int m, k;

scanf(\

k=(m/10==3)?(m=m*10) : (m=m*6); printf(\ return 0; }

例4.5

# include int main() {char ch;

printf(\ scanf(\ switch(ch) {case 'y' ：

case 'Y' ： printf(\ case 'n' ：

case 'N' ： printf(\ default ： printf(\ }

return 0; }

例4.6

# include int main() { float x,y;

printf(\ scanf(\ if(x<10)

if(x<0) y=5*x-6; else y=4*x; else y=2*x+3;

printf(\ return 0; }

例4.7

# include int main() { float x,y;

printf(\ scanf(\switch(x>=0)

{case 0 : y=5*x-6; break; case 1: switch (x>=10)

{case 0 : y=4*x; break; case 1 : y=2*x+3; break; } }

printf(\ return 0; }

例4.8

# include int main() {float a,b,c,t;

scanf(\ if(a>b)

{t=a; a=b; b=t;} /*交换a、b，使a中存储小的数*/ if(a>c)

{t=a; a=c; c=t;} /*交换a、c，使a中存储小的数*/ if(b>c)

{t=b; b=c; c=t;} /*交换b、c，使c中存储大的数*/ printf(\ return 0; }

例4.9

# include int main()

{ float score; int grade; scanf(“%f”, &score); grade =(int)(score/10); switch(grade)

｛case 0 : case 1 :case 2 :case 3 :case 4:case 5:printf(“E \\n”);break;

case 6 : printf(“D\\n”);break; case 7 : printf(“C\\n”);break; case 8 : printf(“B\\n”);break; case 9 : case 10 : printf(“A\\n”); } return 0; } 例4.10

#include #include int main()

{ float a,b,c,d,x1,x2,p,q;

printf(\输入方程系数 a,b,c:\ scanf(\ d=b*b-4*a*c;

if (fabs(d)<=1e-6) /*即d==0*/ printf(\有两个相等的实根：%8.4f\\n\

else if (d>1e-6) /*即d>0*/ { x1=(-b+sqrt(d))/(2*a); x2=(-b-sqrt(d))/(2*a);

printf(\有两个不相等的实根：%8.4f 和 %8.4f\\n\ } else

{ p=-b/(2*a);

q=sqrt(-d)/(2*a);

printf(\有两个共轭复根\\n\ printf(\ printf(\ } return 0; }

例4.11

# include int main() { long i;

float bonus,bon1,bon2,bon4,bon6,bon10; bon1=10*0.1;

bon2=bon1+10*0.075; bon4=bon2+20*0.05; bon6=bon4+20*0.03; bon10=bon6+40*0.015; printf(\利润值:\ scanf(\ if (i<=10)

bonus=i*0.1; else if (i<=20)

bonus=bon1+(i-10)*0.075; else if (i<=40)

bonus=bon2+(i-20)*0.05; else if (i<=60)

bonus=bon4+(i-40)*0.03; else if (i<=100)

bonus=bon6+(i-60)*0.015; else

bonus=bon10+(i-100)*0.01; printf(\奖金是%f\\n\ return 0; }

# include int main()

{long i; int c;

float bonus,bon1,bon2,bon4,bon6,bon10; bon1=10*0.1;

bon2=bon1+10*0.075; bon4=bon2+20*0.05; bon6=bon4+20*0.03; bon10=bon6+40*0.015;

printf(\利润值:\ scanf(\ c=i/10;

if (c>10) c=10; switch(c)

{ case 0 : bonus=i*0.1;break;

case 1 : bonus=bon1+(i-10)*0.075;break; case 2 :

case 3 : bonus=bon2+(i-20)*0.05;break; case 4:

case 5 : bonus=bon4+(i-40)*0.03;break; case 6 : case 7 : case 8 :

case 9 : bonus=bon6+(i-60)*0.015;break; case 10 : bonus=bon10+(i-100)*0.01; } 例5.1

# include int main()

{ int i=1, sum=0;

while(i<=99) {sum+=i; i+=2; }

printf(\ return 0; }

例5.2

# include int main() { int n,sum=0; do

{ scanf(\ sum+=n;

}while(sum<=1000); printf(\ return 0; }

例5.3

# include int main()

{ int num,digit;

printf(\ scanf(\ do

{digit=num; printf(\ num/=10;

}while(num!=0); printf(\ return 0; } 例5.4

# include int main() { int i,n; long s=1;

printf(\ scanf(\ for(i=1;i<=n;i++) s = s*i;

printf(\ return 0; }

例5.5

#include int main() { int n=0;

printf(\ for(;getchar()!='\\n';n++) ; printf(\ return 0; }

例5.6

# include int main() { int i,j;

for(i=1;i<10;i++) /*外层循环控制输出的行数*/

{ for(j=1;j<=i;j++) /*内层循环控制每行输出的列数，以及输出的内容*/ printf(\ printf(\ } return 0; }

例5.7

# include int main()

{ int i,j,k,n=5; char c1= ? ?, c2=?*?; for(i=0;i

{for(j=0;j

for(k=0;k<=2*i;k++)/*输出每行中后面部分的若干个*号*/ printf(\ printf(\ } return 0; }

例5.8

#include int main() { int i,m,k;

printf(\ scanf(\ k=sqrt(m);

for(i=2;i<=k;i++)

if (m%i==0) break;

if (i<=k) printf(\ else printf(\

return 0; }

例5.9

# include int main()

{int i=0,n; long sum=0; while (i<100)

{scanf(\ i++;

if (n<=0) continue; sum+=n; }

printf(\return 0; }

例5.10

# include int main()

{ int i,n,sum=0; i=1;

scanf(“%d”,&n); loop : if (i<=n) { sum+=i; i++;

goto loop; }

printf(\ return 0; }

例5.11

# include # include int main()

{ float i=1.0; int k=1; double t=1.0, pi=0; do{

pi= pi+t;

i+=2; k=-k; t=k/i; }while(fabs(t)>=1e-6); pi= pi*4;

printf(\ return 0; }

例5.12

# include int main()

{int men,women,child;

for(men=0;men<=45;men++)

for(women=0;women<=45;women++) for(child=0;child<=45;child++)

if(men+women+child==45&&men*3+women*2+child*0.5==45)

printf(\ women=%d child=%d\\n\ return 0; }

例5.13

main( )

{int m, n, p, q, k, t ; scanf(“%d, %d”, &m,&n);

if (n

if (n%k==0 && m%k==0) t=k;

if (t==1) printf(“%d和%d互质\\n”, m, n);

else printf(“%d和%d的最大公约数是：%d\\n”, m, n, t); for(k=m*n; k>=p; k--)

if (k%n==0 && k%m==0) t=k;

printf(“%d和%d的最小公倍数是：%d\\n”, m, n, t); } 例6.1

#include int main()

{int n, sum=0, a[10]; float aver; for ( n=0; n<10; n++)

{scanf(“%d”, &a[n]); sum=sum+ a[n]; }

aver =sum/10.0: for(n=0;n<=9;n++)

printf(“%d，”, a[n]);

printf(“%d，%f\\n”, sum，aver); return 0; }

例6.2

# include # define N 10 int main()

{ int n,m,sign=0;

int num[N]={16,35,48,29,56,43,93,64,90,48};

printf(“Please input the number：”) ; scanf(“%d”, &n);

for ( m=0; m

if (n==num[m])

{printf(“%d，%d \\n”, m,num[m]); sign=1;}

if（sign!=1）printf(“Have no this number。”) ;

return 0; }

例6.3

# define N 10 # include # include int main()

{int k, max, loca=0, a[N];

srand(time(NULL) ); /*设置随机数种子为当前时间*/ for (k=0;k

for(k=1;k

if (a[k]>max) {max=a[k]; loca=k;} printf(\ return 0; }

例6.4

# define N 10 # include int main ( )

{ int i, j, m, temp, a[N];

for (i=0; i

for (i=0; i<=N-2; i++) {m=i;

for (j=i+1; j<=N-1; j++) if (a[j]>a[m]) m=j;

temp=a[i]; a[i]=a[m]; a[m]=temp; }

for (i=0; i<=N-1; i++) printf (\printf(\return 0; }

例6.5

# define N 11

# include int main() {int i,k,y;

int x[N]={98,96,87,78,72,64,56,51,43,36}; for (k=0;k<=N-2;k++) printf(“%d ,”,x[k]); printf(“\\n input the number inserted\\n”); scanf(“%d”,&y);

if (y<=x[N-2]) x[N-1]=y; /*若y小于或等于x[N-2]，则将y插在最后*/ else { i=0;

while (i

{if (y>x[i]) /*若y大于x[i]，则将y插在下标为i的位置*/

{for (k=N-2;k>=i;k--) /*下标大于或等于i的元素依次向后移动一个位置*/

x[k+1]=x[k];

x[i]=y; break; }

i++; } }

for (k=0;k<=N-1;k++) printf(“%d ,”,x[k]); printf(“\\n”); return 0; }

例6.6

# define N 15 # include int main()

{ int top, bott, mid, loca, a, b[N]={1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}; scanf(\

top=0; bott=N-1; loca=-1; while (top<=bott) {mid=(top+bott)/2; if (a==b[mid])

{printf(\ loca=mid; break; } else if (a

if (loca==-1)

printf(\ return 0; } 例6.7

# include int main()

{ int a[2][3],b[2][3],c[2][3],d[2][3] ,i,j,k=1; for (i=0;i<2;i++) for (j=0;j<3;j++) {a[i][j]=k++; b[i][j]=a[i][j]+6; }

for (i=0;i<2;i++) for (j=0;j<3;j++)

{c[i][j]=a[i][j]+2*b[i][j]; d[i][j]=8*a[i][j]-b[i][j]; }

for (i=0;i<2;i++)

{for (j=0;j<3;j++) printf(\”,c[i][j]); printf(\ }

for (i=0;i<2;i++)

{for (j=0;j<3;j++) printf(\”,d[i][j]); printf(\ } return 0; } 例6.8

# include int main()

{ int a[2][2]={1，2，4，5}； int b[2][2]={7，8，10，11}； int i,j,a1[2][2]，b1[2][2]，c[2][2]; for (i=0;i<2;i++) for (j=0;j<2;j++)

{a1[j][i]=a[i][j]; /* a1是a的转置矩阵*/ b1[j][i]=b[i][j]; /* b1是b的转置矩阵*/ }

for (i=0;i<2;i++) for (j=0;j<2;j++)

c[i][j]=5*a1[i][j]-2*b1[i][j]; for (i=0;i<2;i++)

{for (j=0;j<2;j++) printf(\”,c[i][j]); printf(\ } return 0; } 例6.9

# define N 7 # include

int main()

{int i, j, a[N][N];

for (i=1; i

for (i=3; i

a[i][j]=a[i-1][j-1]+a[i-1][j]; /*除第1列和对角线及对角线以上的元素外*/

/*其它元素a[i][j]满足a[i][j]=a[i-1][j-1]+a[i-1][j]*/

for (i=1; i

{for (j=1; j<=i; j++) printf(“]”, a[i][j]); printf(“\\n”); } return 0; } 例6.10

# define M 100 # define N 5 int main()

{int i, j; float score[M][N], aver[M], sum;

for (i=0; i

scanf(“%f”, &score[i][j]); for (i=0; i

for (j=0; j

for (i=0; i

# include

# define N 100 /*假设字符数小于100*/ int main()

{ char a[N]; int i, k=0; for (i=0; i

{scanf (\

if （a[i]== '#'）break; k++; }

for (i=0; i

if ('a'<=a[i]&&a[i]<='z'||'A'<=a[i]&&a[i]<='Z')

printf (\ printf(\ return 0; } 例6.12

# include int main()

{ char a[30],b[30]={'\\0'}; int i,j=0; scanf(\ printf(\ for (i=0;i<30;i++)

if (a[i]=='A'||a[i]=='E'||a[i]=='I'||a[i]=='O'||a[i]=='U') {printf(\

b[j++]=a[i]; }

printf(\ printf(\ return 0; }

例6.13

int main（） { int i;

char s1[12]={\ char s2[10]=\ strcpy(s1,s2);

puts(s1); puts(s2);

for (i=0;i<12;i++) printf(\ printf(\

strcpy(s1,\ puts(s1);

for (i=0;i<12;i++) printf(\ return 0; }

例6.14

# include # include int main() {int i, j=0;

char ch, s1[30], s2[30] ;

printf(\：\ gets(s1);

printf(\：\ scanf(\

for (i=0;s1[i]!='\\0';i++)

if (s1[i]!=ch) s2[j++]=s1[i]; s2[j]='\\0'; puts(s2); return 0; } 例6.15

# define K 10 # include int main()

{ int m, n; char ch, a[K+1]; printf(“input character :\\n”);

for ( n=1; n<=K; n++) /*没有使用下标为0的数组元素*/ scanf(“%c”,&a[n]) ; for ( n=1; n<=K-1; n++)

for ( m=1; m<=K-n; m++) if (a[m]>a[m+1])

{ch= a[m]; a[m]= a[m+1]; a[m+1]=ch;}

for ( n=1; n<=K; n++)

printf(“<”, a[n]) ; return 0; }

例6.16

# include # include # define N 6 int main()

{ int i,k=0,h; char big[20], str[N][20]; /*设每个字符串的长度都小于20*/ for (i=0;i

{if (strcmp(str[i],big)>0) strcpy(big,str[i]); if (strlen(str[i])>h) { h=strlen(str[i]); k=i; } }

printf(\

printf(\ return 0; }

例6.17

# include # include int main( )

{ char str1[80],str2[80]; int i,j=0,k=0,num; gets(str1);

while (str1[k]==' ') k++; /*循环结束时，k值是英文句子前面的空格数*/ for (i=k;str1[i]!='\\0';i++)

str2[j++]=str1[i]; /*将str1的前端空格去除后复制到str2中*/ if (strlen(str2)==0)

printf(\ /*若输入的是空句子,包含0个单词*/ else

{num=1;

for (i=1;str2[i]!='\\0';i++)

if (str2[i]==' '&&str2[i+1]!=' ')

num++; /*若一个空格后连接一个非空格，则表示出现了一个单词*/ printf(\ }

return 0; }

例6.18

# include # define N 6 int main()

{char number[N][10], name[N][10], phnoe[N][15], address[N][20], find[10]; int k, p,mark=0;

for(k=0; k

{gets(number[k]); gets(name[k]); gets(phnoe[k]); gets(address ); }

printf(“输入需要查找的学生的学号:\\n” );

gets(find);

for(k=0; k

if (strcmp(find, number[k])==0) {p=k; mark=1; break;}

if (mark==1) printf(“%s,%s,%s,%s\\n”, number[p], name[p], phnoe[p]),address[p]); else printf(“没有发现!”); return 0; }

例7.1

# include # define N 10

int score[N]={97,90,88,82,79,78,73,68,66,65}; void function1( ) {int i,s=0;

for(i=1;i

printf(“平均分为：%f\\n”,（float)s/N); return ; }

int function2(int n) {int i,j,k=-1; for(i=1;i

if (n==score[i]) k=i;

return k; }

main()

{ int a, t; function1();

printf(“输入一个分数”); scanf(“%d”,&a); t=function2(a);

if (t>=0) printf(“该分数在%d个分数中排名第%。”,N,t+1); else printf(“不存在此分数！”); return 0; } 例7.2

int max(int a, int b) { int x;

if(a>b) x=a; else x=b; return x; } 例7.3

#include

void fun(int b) /*函数定义，b为形参*/ { int st[20]={2,6,3,5,7,1,4,3,4,2,2,6,6,1,7,5,5,2,1,7}; int k ,n=0;

for (k=0; k<20; k++) if (st[k]==b) n++; printf(\}

int main() { int a,yn=0; while(yn==0)

{ printf(\—9): \

scanf(\调用函数，a为实参*/ printf(\：\ scanf(\ }

return 0; } 例7.4

＃include

float fadd(float a , float b) /*函数定义*/ {float s; s=a+b;

return(s); /*返回计算结果：两个实数的和*/ }

int main()

{ float x,y,sum，aver;

scanf(“%f,%f”,&x,&y); /*输入两个实数*/ sum=fadd(x,y); /*函数调用*/ aver=fadd(x*x,y*y)/2;

printf(“\\n%f，%f”,sum,aver); return 0; }

例7.5

# include #include

int prime(int i) /*函数定义*/ { int j,k,flag=1; k=sqrt(i);

for (j=2;j<=k;j++)

if (i%j==0) {flag=0; break; } return flag; }

int main( ) { int i;

for (i=3; i<100; i++)

if (prime(i)==1) /*函数调用*/ printf (\ printf(\return 0; }

例7.6

#include

int imax(int x,int y) /*函数定义*/ {return (x>y?x:y); } int main()

{ int n1,n2,n3,n4,d;

scanf(“%d,%d,%d,%d”,&n1,&n2,&n3,&n4);

d=imax(imax(n1,n2),imax(n3,n4)); /*函数调用*/ printf(“The max=%d”,d); return 0; } 例7.7

＃include

double sum(int m); /*函数声明*/ long fact(int p); /*函数声明*/ int main()

{ int n; float total;

printf(“\\nplease input n:”); scanf(“%d”,&n);

total=sum(n); /*函数调用*/ printf(“\\ne=%f”, total); return 0; }

double sum(int m) /*函数定义*/ { double s=1; int i; for(i=1;i<=m; i++)

s+=1.0/fact(i); /*函数调用*/ return(s); }

long fact(int k) /*函数定义*/ { long f=1; int i; for(i=1;i<=k; i++) f*=i; return(f); }

例7.8

#include

long fact(int n); /*函数声明*/ int main() { int n;

printf(“\\nplease enter n:”); scanf(“%d”,&n);

printf(“\\n n!=%ld”,fact(n)); /*函数调用*/ return 0; }

long fact(int n) /*函数定义*/

{if (n==1||n==0) return(1); /*若是终结条件，返回终结条件下的值*/ else return(n*fact(n-1)); /*若非终结条件，递归调用函数自身*/ ｝ 例7.9

#include

long fib(int n); /*函数声明*/ int main ( ) {int i ;

for (i=1; i<=20; i++)

{printf (“ld”, fib(i)) ; /*函数调用*/ if ( i%5==0 ) printf(“\\n”); }

return 0; }

long fib(int n) /*函数定义*/ {if ((n==1)||(n==2)) return 1; else return (fib(n-1)+fib(n-2));

}

例7.10

#include

void move(char x,char y)

{printf(“%c-->%c\\n”,x,y); }

void hanoi(int n,char one,char two,char three) { if (n==1) move(one,three);

else {hanoi(n-1,one,three,two); move(one,three);

hanoi(n-1,two,one,three); } }

main()

{int m; scanf(“%d”,&m); hanoi(m,‘A’,‘B’,‘C’); }

例7.11

#include

void add(int b[],int n); /*函数声明*/ int main()

{int i,a[ ]={0,1,2,3,4,5,6,7,8,9};

for(i=0;i<10;i++) printf(“=”,a[i]);

add(a,10); /*函数调用*/ for(i=0;i<10;i++) printf(“=”,a[i]); return 0; }

void add(int b[],int n) /*函数定义*/ { int i;

for(i=0;i

#include #define N 10

float average(float a[],int n)； /*函数声明*/ int main()

{float score[N],aver; int i,num=0;

printf(“input scores:\\n”);

for(i=0;i

aver=average(score,N); /*函数调用*/ printf(“average=%f\\n”,aver); for(i=0;i

{if (score[i]

printf(“less than average: %d”,num); return 0; }

float average(float a[],int n) /*函数定义*/ {int i;

float aver ,sum=a[0];

for(i=1;i

例7.13

# include

int a=0; float b; /*定义全局变量a,b*/ float func(int s[ ],int n); /*函数声明*/ int main()

{ int k; int x[10]; /*定义局部变量*/ for (k=0;k<10;k++)

scanf(“%d”,&x[k]); b=func(x,10);

for (k=0;k<10;k++) if (x[k]>b) a++;

printf(“\\n %d”,a); /*输出全局变量a的值*/ return 0; }

float func(int s[ ],int n)

{int k,a=0; float b; /*定义局部变量k,a,b*/ for(k=0;k

printf(“\\n%d”,a); /*输出局部变量a的值*/ b=(float)a/n; return(b); }

例7.14

#include

int sum(int x); /*函数声明*/ int main( ) {int i,k;

for(i=1;i<=10;i++) k=sum(i);

printf(“\\n1+2+ ? +- = -”,i-1,k); return 0; }

int sum(int x)

{ static int s=0; /*定义静态存储类型内部变量*/ s=s+x;

return s; }

例7.15

/*file1.c*/

# include

int x=0; int main() { func( );

printf(“\\nx=%d”,x); return 0; }

/*file2.c*/

extern int x; /*外部变量声明*/ int func( ) { x+=3; } 例7.16 /*file1.c*/

#include int main( )

{extern char get_ch(); /*外部函数声明*/ printf(“%c”,get_ch()); return 0; }

/*file2.c*/

char get_ch() {char ch;

ch=getchar();

if (‘a’<=ch && ch<=‘z’) ch=ch-32; return(ch); } 例7.17

# include

int numb() /*随机产生正整数函数（两位数）*/ {int n;

mark1: n=rand();/*rand()值是0到32767之间的随机整数*/ if (n>=100 || n<10) goto mark1; return n; }

void add() /*练习加法函数*/ {int a,b,c,x=1; while(x==1)

{a=numb(); b=numb(); printf(\

scanf(\

if (a+b==c) printf(\回答正确！\\n\ else printf(\回答错误！\\n\

printf(\若想停止练习加法请输入0， 否则请输入1。\\n\ scanf(\ }

return; }

void sub() /*练习减法函数*/ {int a,b,c,x=1; while(x==1)

{mark2:a=numb(); b=numb(); if (a

if (a-b==c) printf(\回答正确！\\n\ else printf(\回答错误！\\n\

printf(\若想停止练习减法请输入0， 否则请输入1。\\n\ scanf(\ }

return; }

main() {int d;

srand(time(NULL)); /*设置随机数种子为当前时间*/ while (1)

{printf(\小学生两位数加、减法练习软件-----------\\n\ printf(\、练习两位数加法--------------\\n\ printf(\、练习两位数减法--------------\\n\ printf(\、结束练习------------- -----\\n\ printf(\请输入1或2或3---:\ scanf(\ if (d==1) add();

else if (d==2) sub(); else if (d==3)

{printf(\本次练习结束了,再见!------- \\n\ break; }

else printf(\输入错误!请重新输入！----- \\n\ } }

例7.18

#include

#define SIZE 100 /*不妨设班级学生数少于100*/

void inputdata( ); /*函数声明*/ void calculdata( ); /*函数声明*/ void statisdata( ); /*函数声明*/ void querydata ( ); /*函数声明*/

float score[SIZE][4]; /* score存储每个学生平时、期中、期末和总评成绩*/ char name[SIZE][15]; /* name存储每个学生姓名*/ int sum; /* sum存储实际学生人数*/ int main() { int choo;

printf(“请输入实际学生人数:”); scanf(“%d”, &sum); while(1)

{ printf(“请选择下面的某一项任务:”);

printf(“\\n(1)输入每个学生的姓名、平时成绩、期中成绩、期末成绩。”); printf(“\\n(2)计算并输出每个学生的总评成绩。”);

printf(“\\n(3)根据总评成绩对学生分类统计，输出各分数段的学生数。”); printf(“\\n(4)根据输入的学生姓名，查找并打印该学生的各项成绩。”); printf(“\\n(5)结束程序运行。”);

printf(“\\n请输入你的选择（1或2或3或4或5）:”); scanf(“%d”, &choo); if （choo==5）break; switch（choo）

{case 1 ： inputdata( ); break; /*调用输入学生姓名成绩函数*/

case 2 ： calculdata( ); break; /*调用计算总评成绩函数*/ case 3 ： statisdata( ); break; /*调用统计各分数段人数函数*/ case 4 ： querydata( ); break; /*调用根据姓名查找函数*/ } }

printf(“\\n程序运行结束，再见。”); return 0; }

void inputdata( ) /*输入学生姓名成绩函数*/ { int i;

for(i=0;i

{printf(“\\n请输入学生的姓名:”);

gets(name[i]);

printf(“请顺序输入学生平时、期中、期末成绩(例如98,85,96):”); scanf(“%f,%f,%f”,&score[i][0], &score[i][1],&score[i][2]); }

return; }

void calculdata( ) /*计算总评成绩函数*/ { int i;

for(i=0;i

score[i][3]= 0.1*score[i][0]+ 0.3*score[i][1]+ 0.6*score[i][2] printf(“\\n每个学生总评成绩如下:\\n”); for(i=0;i

printf(“%s:%f\\n”,name[i],score[i][3]); return; }

void statisdata( ) /*统计各分数段人数函数*/

{ int i,d, grade[5]={0}; /* grade存储分类统计结果(各分数段人数)*/ for (i=0;i

{ d=(int)(score[i][3]/10);

switch(d)

{ case 10 :

case 9 : grade[4]=grade[4]+1;break; case 8 : grade[3]=grade[3]+1;break; case 7 : grade[2]=grade[2]+1;break; case 6 : grade[1]=grade[1]+1;break; default : grade[0]=grade[0]+1; } }

printf(“\\n总评成绩≥90的人数是:%d”, grade[4] );

printf(“\\n总评成绩≥80且＜90的人数是:%d”, grade[3] ); printf(“\\n总评成绩≥70且＜80的人数是:%d”, grade[2] ); printf(“\\n总评成绩≥60且＜70的人数是:%d”, grade[1] ); printf(“\\n总评成绩＜60的人数是:%d”, grade[0] ); return; }

void querydata( ) /*根据姓名查找函数*/ { char lookname[20]; int i; printf(“\\n请输入姓名:”); gets(lookname);

for(i=0;i

if (strcmp(name[i],lookname)==0)

{ puts(name[i]);

printf(“平时成绩%f, 期中成绩%f, 期末成绩%f,总评成绩%f\\n”,

score[i][0],score[i][1], score[i][2],score[i][3] );

}

if (i==sum) printf(“没有找到!\\n”); return; }

例8.1

# include

# define SIZE 100 int main()

{int i,sum=0, data[SIZE];

for(i=0;i

{scanf(“%d”, &data[i]); sum=sum+data[i]; }

printf(“sum=%d\\n”,sum); return 0; }

例8.2

# include

#define S(a, b, h) (a+b)*h/2 int main()

{int c1=6, c2=8, c3=10;

printf(“S=%d\\n”, S(c1, c2, c3));

return 0; } 例8.3

#define START { #define OK }

#define MAX(x,y) x>y?x:y

# include

#include “bj.h” int main() START

double x=567.89, y=123.45; int a=25, b=37;

printf(“double MAX=%lf\\n”, MAX(x,y)); printf(“int MAX=%d\\n”, MAX(a,b)); return 0;

OK 例8.4 /*file.c*/

#include #include “myfile.txt” int main() { fun(); return 0; }

myfile.txt

void fun() {char c;

if((c=getchar())!=?\\n?) {putchar(c); fun();}

} 例8.5

# include # define TERM 0 int main()

{int i, a[10]; float s=0, t=1 ;

for (i=0; i<10; i++) scanf(“%d”, &a[i]);

# if TERM

for (i=0; i<10; i++) t=t*a[i]; printf (\ # else

for (i=0; i<10; i++) s= s+a[i]; printf (\ # endif return 0; }

例9.1

# include int main() {int i,j, *p;

p=&i; /*p指向i */ i=10;

printf(“%d,%d\\n”,i,*p); *p=100;

printf(“%d,%d\\n”,i,*p); p=&j; *p=200;

printf(“%d,%d\\n”,j,*p); return 0;

}

例9.2

# include

int main()

{int num1=12, *p1; /*定义一个指向int型数据的指针变量p1 */ float num2=3.14, *p2; /*定义一个指向float型数据的指针变量p2 */ char ch=?p?, *p3; /*定义一个指向char型数据的指针变量p3 */ p1=&num1; /*取变量num1的地址，赋值给p1 */ p2=&num2; /*取变量num2的地址，赋值给p2 */ p3=&ch; /*取变量ch的地址，赋值给p3 */ printf(“num1=%d, *p1=%d\\n”, num1, *p1);

printf(“num2=%4.2f, *p2=%4.2f\\n”, num2, *p2); printf(“ch=%c, *p3=%c\\n”, ch, *p3); return 0; }

例9.3

# include

int main()

{ int num1,num2;

int *p1=&num1, *p2=&num2, *p;

printf(“Input the first number: ”); scanf(“%d”,p1);

printf(“Input the second number: ”); scanf(“%d”,p2);

printf(“num1=%d, num2=%d\\n”, num1, num2);

if( *p1 > *p2 ) /*如果num1>num2，则交换指针的值*/ {p= p1；p1= p2；p2=p;}

printf(“min=%d, max=%d\\n”, *p1, *p2); return 0;

}

例9.4

# include

int main()

{ int a[10], *p=a, i,sum=0; printf(“Input 10 numbers: ”); for(i=0; i<10; i++)

scanf(“%d”, p+i); /*使用指针变量来输入数组元素的值*/ printf(“array a: ”); for(i=0; i<10; i++)

{printf(“%d ”, *(p+i)) ; /*使用指向数组的指针变量输出数组元素的值*/ sum=sum+*(p+i) ; }

printf(“\\n sum=%d \\n”, sum); return 0; }

例9.5

# include

int main()

{ char string[ ] = “she is our teacher “; printf(\ return 0; } 例9.6

# include

int main()

{ char *string =“she is our teacher”; printf(“%s\\n”,string); return 0; }

例9.7

# include

void copystr(char str1[], char str2[]) { int i=0;

while(str1[i] != ?\\0?)

{ str2[i] = str1[i]; i++; } str2[i] = ?\\0?; }

int main()

{ char a[20 ] = “I love china!”; char b[20 ] = “good!”;

printf(“a =%s\\n b =%s\\n”, a,b); copystr(a,b);

printf(“a =%s\\n b =%s\\n”, a,b); return 0; }

# include

void copystr(char str1[], char str2[]) { int i=0;

while(str1[i] != ?\\0?)

{ str2[i] = str1[i]; i++; } str2[i] = ?\\0?; }

int main() {int i;

char *a = “I love china!”; char *b = “good!”;

printf(“a =%s\\n b =%s\\n”, a,b); copystr(a,b);

for (i=0;*(a+i)!=?\\0?; i++) putchar(*(a+i)); printf(“\\n”);

for (i=0;*(b+i)!=?\\0?; i++) putchar(*(b+i)); return 0; }

# include

void copystr (char *str1, char *str2) {

for (; *str1 != ?\\0?; str1++, str2++) *str2 = *str1; *str2 = ?\\0?; }

int main()

{char *a = “I love china!”; char *b = “good!”;

for (i=0;*(a+i)!=?\\0?; i++) putchar(*(a+i)); printf(“\\n”);

for (i=0;*(b+i)!=?\\0?; i++) putchar(*(b+i)); printf(“\\n”); copystr(a,b);

puts(a); puts(b); return 0; }

# include

void copystr (char *str1, char *str2) {int i=0;

for (; (*(str2+i)=*(str1+i))!= ?\\0?; i++) ; /*循环体为空语句*/ }

int main()

{char a[20]= “I love china!”; char b[20]= “good!”;

printf(“a =%s\\n b =%s\\n”, a,b); copy_string (a, b); puts(a); puts(b); return 0;

} 例9.8

# include

int main()

{int a[3][4]={{1,2,3,4},{5,6,7,8},{9,10,11,12}};

int (*p)[4], row, col; /*定义行指针变量p*/ p=a;

printf(“Input row = ”); scanf(“%d”, &row); printf(“Input col = ”); scanf(“%d”, &col);

printf(“a[%d][%d] = %d\\n”, row, col, *(*(p+row)+col)); return 0;

}

例9.9

# include int main()

{ void total_average(float *p,int n);

void student_average(float (*p)[3],int n); int i,j,k; float x, score[5][3]; printf(“input score:\\n”); for(i=0;i<5;i++)

for(j=0;j<3;j++) { scanf(“%f”,&x); score[i][j]=x; }

total_average(score[0],15);

printf(“Input No. of student:\\n”); scanf(“%d”, &k);

student_average(score,k); return 0;

}

void total_average(float *p,int n) { float *p_end, sum=0, aver ; p_end=p+n-1;

for (; p<=p_end; p++) sum=sum+(*p); aver=sum/n;

printf(“average=%5.2f\\n”,aver); }

void student_average(float (*p)[3],int n) {int i; float sum1=0.0, aver;

for (i=0; i<3; i++) sum1=sum1+*(*(p+n)+i); aver=sum1/3;

printf(“The average score of No.%d is :%5.2f”,n,aver); }

例9.10

#include #include

void sort(char *addr[], int n); /*函数声明*/ void print(char *addr[], int n); /*函数声明*/ int main()

{char *addr[] ={“Shanghai”, “Beijing” , “Guangzhou” , “Hangzhou”, “Nanjing”｝; int n = 5;

sort(addr, n); /*排序函数的调用*/ print(addr, n); /*输出函数的调用*/ return 0; }

void sort(char *addr[], int n) /*选择法排序*/ {char *temp; int i, j, k;

for(i=0; i

for(j=i+1; j

if (strcmp(addr[k], addr[j])> 0) /*比较addr[k]与addr[j]所对应字符串的大小*/ k = j;

if (k != i) /*交换addr[i]与addr[k]的指向 */ ｛temp = addr[i]; addr[i] = addr[k]; addr[k] = temp; ｝

} }

void print(char *addr[], int n) { int i;

for (i=0; i

printf(\ }

例9.11

#include #include int main()

{char *addr[] ={“Shanghai”, “Beijing” , “Guangzhou” , “Hangzhou”, “Nanjing”}; char **p；int n; p=addr;

for（n=0; n<5; n++,p++）

printf(\ addr[n], *p); }

例9.12

#include

void swap(int *p1, int *p2); /*函数声明*/ int main()

{int a=3, b=5, *pa, *pb; printf(“Before swap:”); printf(“a=%d,b=%d\\n”,a,b); pa=&a; pb=&b; swap(pa,pb);

printf(“After swap:”);

printf(“a=%d,b=%d\\n”,a,b); return 0; }

void swap(int *p1, int *p2) /*函数定义*/ {int temp;

temp=*p1; *p1=*p2; *p2=temp; } 例9.13

int max(int x, int y); int main ()

{ int (*p)(int, int); int a,b,c; p = max;

scanf(\c = (*p)(a,b);

printf(\

return 0;

}

int max(int x, int y) {int z;

if (x>y) z = x; else z = y; return z; }

例9.14

#include

float f1(float x); /*函数声明*/ float f2(float x); /*函数声明*/ float f3(float x); /*函数声明*/ float f4(float x); /*函数声明*/ int main( )

{ void test(float (*f)(float)); /*函数声明*/ int n;

printf(“input n:”); scanf(“%d”,&n); switch(n)

{case 1: test(f1);break; /*把函数f1的入口地址传给函数test的形参*/ case 2: test(f2);break; /*把函数f2的入口地址传给函数test的形参*/ case 3: test(f3);break; /*把函数f3的入口地址传给函数test的形参*/ case 4: test(f4);break; /*把函数f4的入口地址传给函数test的形参*/ } return 0; }

void test(float (*f) (float)) /*函数定义*/ {float x, result; printf(“input x:”); scanf(“%f”,&x); result=(*f)(x);

printf(“result=%f”,result); }

float f1(float x) /*函数定义*/ {return x;}

float f2(float x) /*函数定义*/ {return 2*x*x-1;}

float f3(float x) /*函数定义*/ {return 4*x*x*x-3*x;}

float f4(float x) /*函数定义*/ {return 8*x*x*x*x-8*x*x+1; } 例9.15

# include

char *seek(char *q，char ch) ; /*函数声明*/ int main()

{char str[80],ch,*p；

printf(“请输入一串字符：” ); gets(str);

printf(“请输入要查找的一个字符：” ); scanf(“%c”, &ch); p=seek(str, ch);

if (p==NULL) printf(“字符%c在本字符串中不存在。\\n”, ch ); else

{printf(“在字符串中，字符%c第一次出现的地址是：%d。\\n”, ch, p ); printf(“从地址%d开始，直到字符串尾的所有字符是：%s。\\n”, p,p); } return 0; }

int *seek(char *q, char ch ) /*定义返回指针值的函数*/ {while (*q!=?\\0?) if (*q!=ch) q++;

else return q; /*返回要查找的字符的地址*/ return NULL; /*没有找到, 返回空指针*/ }

例9.16

#include

int main (int argc, char *argv[]) { int i;

for (i = 0; i < argc; ++i) printf(\ return 0; } 例9.17

# include # define N 5 # define M 4

char *spbh[N]={\ float sse[N][M]=

{{45,47,50,52},{38,40,41,43},{23,20,24,23},{34,37,33,30},{41,43,40,39}};

/*sse第k行的4个数是spbh[k]所对应的商品编号的4个销售额(k=0,1,2,3,4)*/ void f1( )

{char num[10]; int i,j; float sum=0; printf(\请输入商品编号:\ scanf(\ for (i=0; i

if ( strcmp(num,spbh[i])==0) j=i; if (0<=j&&j

/*若为真,则j中存储的是与给定商品编号对应的数组sse的行下标*/

{for (i=0; i

printf(\商品编号为%s的四年销售总额为%f。\\n\ }

else printf(\不存在此编号!\\n\ return; }

void f2( )

{char num[10]; int year,i,j,k; ; printf(\请输入商品编号:\ scanf(\ for (i=0; i

if ( strcmp(num,*(spbh+i))==0) j=i;

printf(\请输入年份(2006或2007或2008或2009):\ scanf(\

k=year-2006; /*k值是与年份对应的数组sse的列下标*/ if ((0<=j&&j

printf(\编号为%s的商品在%d年销售额为%f。\\n\ else printf(\不存在此编号或年份!\\n\ return; }

void f3( )

{int year,i,k,*p; float sum=0; p=&year;

printf(\请输入年份(2006或2007或2008或2009):\ scanf(\ k=*p-2006;

if (0<=k&&k

printf(\在%d年所有商品销售额为%f。\\n\ }

else printf(\年份输入错误!\\n\ return; }

void f4( )

{int year,i,k,maxnum=0,minnum=0; float max,min; printf(\请输入年份(2006或2007或2008或2009):\ loop2: scanf(\ if (year<2006||year>2009)

{printf(\年份输入错误!\\n\ goto loop2; }

k=year-2006; max=*(sse[0]+k);

min=*(sse[0]+k);

for (i=1; imax) {max=*(sse[i]+k); maxnum=i; }

if (*(sse[i]+k)

printf(\在%d年所有商品销售额中,\

printf(\商品编号%s的销售额%f最大,\ printf(\商品编号%s的销售额%f最小。\ return; }

int main() {int xz; while(1)

{printf(\关于商品销售额的计算和查找+++++++++++\\n\ printf(\根据给定的商品编号，计算该商品四年的销售总额。\\n\ printf(\根据给定的商品编号和年份，找出与之对应的销售额。\\n\ printf(\根据给定的年份，计算该年所有商品的销售总额。\\n\

printf(\根据给定的年份，分别找出该年销售额最大、最小的商品。\\n\ printf(\结束程序运行。\\n\ printf(\请选择(1,2,3,4,5):\ loop1:scanf(\ if (xz<1||xz>5)

{printf(\错误输入!请重新输入:\ if (xz==5) break; switch (xz)

{case 1: f1(); break; case 2: f2(); break; case 3: f3(); break; case 4: f4(); break; } }

printf(\程序运行结束, 再见!\ return 0; }

例10.1

#include struct student { unsigned num;

char name[10] float score_math； float score_english； float score_computer };

int main()

{ struct student st; float aver;

printf(“Input number:”); scanf(“%d”,&st．num); printf(“Input name:”); scanf(“%s”,st．name);

printf(“Input score of mathmatics:”); scanf(“%f”,&st．score_math); printf(“Input score of english:”); scanf(“%f”,&st．score_english); printf(“Input score of computer:”); scanf(“%f”,&st．score_computer); aver=(st．score_math+ st．score_english+ st．score_computer)/3; printf(“Number=%d\\n”, st．num); printf(“Name=%s\\n”, st．name); printf(“average=%f\\n”, aver); return 0; }

例10.2

# include # define N 6 struct student { unsigned num; char name[15]; int age; float score; };

int main() { int i;

float x, average=0.0, averscore=0.0; struct student st[N]; for(i=0;i

{printf(“Input number:”); scanf(“%d”,&st[i].num); printf(“Input name:”); scanf(“%s”,st[i].name); printf(“Input age:”); scanf(“%d”,&st[i].age); printf(“Input score:”); scanf(“%f”,&x);

st[i].score=x; /*用一实型变量间接给score赋值*/ average=average+st[i].age; /*计算年龄的总和*/ averscore=averscore+st[i].score; /*计算成绩的总和*/ }

average=average/N; /*计算平均值*/ averscore=averscore/N; for(i=0;i

{ printf(“Number=%d, ”,st[i].num);

printf(“Name=%s, ”,st[i].name); printf(“Age=%d, ”,st[i].age); printf(“Score=%f\\n”,st[i].score); }

printf(“Average Age =%f\\n”, average); printf(“Average Score=%f\\n”, averscore); return 0;

} 例10.3

# include # define N 6 struct student { unsigned num; char name[15]; int age; float score; };

int main() { int i;

float x, average=0.0, averscore=0.0; struct student st[N],*p; p=st;

for(i=0; i

{printf(“Input number:”); scanf(“%d”,&p->num); printf(“Input name:”); scanf(“%s”, p->name); printf(“Input age:”); scanf(“%d”,& p->age); printf(“Input score:”); scanf(“%f”,&x);

p->score=x; /*用一实型变量间接给score赋值*/ average=average+ p->age; /*计算年龄的总和*/ averscore=averscore+ p->score; /*计算成绩的总和*/ }

average=average/N; /*计算平均值*/ averscore=averscore/N; for(p=st, i=0; i

{ printf(“Number=%d, ”, p->num); printf(“Name=%s, ”, p->name); printf(“Age=%d, ”, p->age); printf(“Score=%f\\n”, p->score); }

printf(“Average age =%f\\n”, average); printf(“Average score=%f\\n”, averscore); return 0; } 例10.4

1）管理人员的结构为： struct manager_type

{char position[11]； /*职务*/ char rank[21]； /*级别*/ }；

2）技术人员的结构为： struct technician_type

{ char tech_post[11]； /*职称*/ char degree[11]； /*学位*/ char major[11]； /*专业*/ };

3）工人的结构为： struct worker_type

{ char speciality[11]； /*工种*/ int rank； /*级别*/ char education[11]； /*文化程度*/ };

4）定义一分类挡案数据结构为共用体： union sort_type

{ struct manager_type m； struct technician_type t； struct worker_type w； };

5） 定义出生日期的结构： struct date { int year; int month; int day; }

6）利用上述定义，建立一职工档案数据结构： struct employee_type { char name[8]； int sex；

struct date birsday； int type；

union sort_type d； }; 例10.5

# include

int main()

{enum week{sun,mon,tue,wed,thu,fri,sat}; enum week wk;

char *name[ ]={“Sunday”,“Monday”, “Tuesday”, “Wednesday”,

“Thursday”, “Friday”, “Saturday” };

for(wk=sun; wk<=sat; wk++)

printf(“\\n-: %s”, wk, name[wk]); return 0; }

例10.6

# include

# define N 100 /*假设产品的种类数小于100种*/ struct product { char name[10]; char place[10]; int price; long count; }a[N];

int num; /*num存储库存产品的实际种类数*/ void fun1()

{int i, k=0; num=0; for (i=0;i

{printf(\输入产品名\\n\ printf(\输入产地:\\n\

printf(\输入进货单价（元/吨)\\n\ printf(\输入库存数量（吨)\\n\ num=num+1;

printf(\若结束输入请按1，若继续输入请按0。\\n\ if (k==1) break; } return; }

void fun2()

{int i; long sum=0; for (i=0;i

sum=sum+a[i].count;

printf(\库存产品数量总和=%ld\\n\ return; }

void fun31()

{int i; char pron[10];

printf(\请输入产品名：\ for (i=0;i

if (strcmp(pron,a[i].name)==0)

printf(\ return; }

void fun32()

{int i; char pron[10];

printf(\请输入产地：\ for (i=0;i

if (strcmp(pron,a[i].place)==0)

printf(\ return; }

void fun3() {int se; while(1)

{printf(\按产品名或产地查找并输出产品信息------\\n\ printf(\按产品名查找并输出产品信息------\\n\ printf(\按产地查找并输出产品信息------\\n\ printf(\结束查找，返回上一级操作。------\\n\ printf(\请选择（1，2，3）:\ if (se==1) fun31(); else if (se==2) fun32(); else break; } return; }

int main() { int se ; while (1)

{printf(\库存产品信息管理------\\n:\ printf(\输入库存产品信息------\\n\

printf(\计算并输出库存产品数量总和------\\n\ printf(\查找并输出产品信息------\\n\ printf(\结束操作------\\n\

printf(\请选择(1,2,3,4)：\ scanf(\ if (se==1) fun1(); else if (se==2) fun2(); else if (se==3) fun3(); else if (se==4) break;

else {printf(\选择有误!请重新选择!\\n\ }

printf(\谢谢使用!再见!\\n\ return 0; }

例11.1

# include

int main()

{unsigned char a=18,b; b=~a;

printf(“~a=%d”,b);

return 0; }

# include

int main()

{char a=18,b; b=~a;

printf(“~a=%d”,b); return 0; } 例11.2

# include

int main()

{unsigned char a=18,b; b=a<<3;

printf(“a<<3=%d”,b); }

# include

int main()

{char a=18,b; b=a<<3;

printf(“a<<3=%d”,b); return 0; 例11.3

# include

int main()

{unsigned char a=18,b; b=a>>3;

printf(“a>>3=%d”,b); return 0; } 例11.4

# include

int main()

{unsigned char a=173,b=203,c; c=a&b;

printf(“a&b=%d”,c); return 0; } 例11.5

# include

int main()

{char a=-83,b=-53,c;

c=a&b;

printf(“a&b=%d”,c); return 0; } 例11.6

# include

int main()

{unsigned char a=173,b=203,c; c=a|b;

printf(“a|b=%d”,c); return 0; } 例11.7

# include

int main()

{char a=-83,b=-53,c; c=a|b;

printf(“a|b=%d”,c); return 0; } 例11.8

# include

int main()

{unsigned char a=173,b=203,c; c=a^b;

printf(“a^b=%d”,c); return 0; } 例11.10

# include int main()

{unsigned int i,n,b,mask; mask=0x8000;

printf(\ scanf(\

printf(\ %0x is:\ for(i=0;i<16;i++) {b=(mask&n)?1:0; printf(\ if(i==7) printf(\ mask=mask>>1; } return 0; }

例11.11

# include

int main()

{unsigned int n,a,b,c,d;

printf(\ scanf(\

printf(\ scanf(\ b=a<<16-n; c=a>>n; d=b|c;

printf(\ return 0; } 例12.1

#include int main()

{FILE *fp; int i;

fp=fopen(“cj.dat”, “rb”);

if(fp==NULL) printf(“File open failed!\\n”); else printf(“File open successful!\\n”); i=fclose(fp);

if (i==0) printf(“File close successful!\\n”); else printf(“File close failed!\\n”); return 0; }

例12.2

#include int main( )

{ FILE *fp ; char ch;

if ((fp=fopen(“d:\\\\yw.txt”,“w”))==NULL)

{printf(“cannot open file!\\n”); exit(0); } ch=getchar( ); while(ch !=?#?)

{ if (ch>=‘a? && ch<=‘z?) fputc(ch , fp) ; else putchar(ch) ; ch = getchar( ); } fclose(fp); return 0; }

例12.3

# include int main( )

{ FILE *fp1 , *fp2 ;

char ch , file1[30] , file2[30] ; /* file1和file2分别用来存储文件名*/

scanf(“%s”, file1); /* file1中存储的文件名必须是已经存在的文件*/ scanf(“%s”, file2);

if ((fp1=fopen(file1 , “r”))==NULL)

{printf(“cannot open infile\\n”); exit(0); } if ((fp2=fopen(file2 , “w”))==NULL)

{printf(“cannot open outfile\\n”); exit(0); }

while (!feof(fp1)) /*在屏幕上显示file1文件信息*/ {ch=fgetc(fp1); putchar(ch); }

rewind(fp1); /*让文件内部的位置指针重新移动到文件首*/ while ( !feof(fp1) ) /*复制file1文件中的英文字母到file2*/ { ch=fgetc(fp1) ;

if ((ch>=‘a? && ch<=‘z?) || (ch>=‘A? && ch<=‘Z?)) fputc( ch , fp2 ); }

fclose(fp1); fclose(fp2);

return 0; }

例12.4

#include #define SIZE 10 struct student { int num;

char name[8]; int age; }stu[SIZE]; int main()

{ FILE *fp; int i;

if ((fp=fopen(\ {printf(\ exit(0); }

for (i=0; i

printf(\ getchar(); /* 用getchar()来抵消前面的回车符*/ gets(stu[i].name);

printf(\ scanf(\ }

for (i=0;i

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