《C语言程序设计》课后习题答案(第四版)谭浩强

1-5 #include int main ( )

{ printf (\ printf(\ Very Good!\\n\\n\

printf (\ return 0; }

1-6#include int main() {int a,b,c,max;

printf(\ scanf(\ max=a; if (max

printf(\ return 0; } 4-4-1

#include int main() {

int a,b,c;

printf(\请输入三个整数:\ scanf(\ if (a

printf(\ else

printf(\ else if (a

printf(\ else

printf(\ return 0; } 4-6.

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

printf(\输入x:\ scanf(\

if(x<1) /* x<1 */ { y=x;

printf(\ y=x=%d\\n\ }

else if(x<10) /* 1==10 */ { y=3*x-11; printf(\ y=3*x-11=%d\\n\ } return 0; }

4-7-1

#include int main() {

int x,y;

printf(\ scanf(\ y=-1; if(x!=0) if(x>0) y=1; else

y=0;

printf(\ return 0; } 4-7-2

#include int main() {

int x,y;

printf(\ scanf(\ y=0; if(x>=0)

if(x>0) y=1; else y=-1;

printf(\

return 0; } 4-8

#include int main()

{ float score; char grade;

printf(\请输入学生成绩:\ scanf(\

while (score>100||score<0) {printf(\输入有误,请重输\ scanf(\ }

switch((int)(score/10)) {case 10: case 9: grade='A';break; case 8: grade='B';break; case 7: grade='C';break; case 6: grade='D';break; case 5: case 4: case 3: case 2: case 1: case 0: grade='E'; }

printf(\成绩是 %5.1f,相应的等级是%c\\n \ return 0; } 4-11

#include int main()

{int t,a,b,c,d;

printf(\请输入四个数:\

scanf(\ printf(\ if (a>b)

{ t=a;a=b;b=t;} if (a>c)

{ t=a;a=c;c=t;} if (a>d)

{ t=a;a=d;d=t;}

if (b>c)

{ t=b;b=c;c=t;} if (b>d)

{ t=b;b=d;d=t;} if (c>d)

{ t=c;c=d;d=t;}

printf(\排序结果如下: \\n\

printf(\ %d %d %d \\n\ ,a,b,c,d); return 0; } 4-12

#include int main() {

int h=10;

float x1=2,y1=2,x2=-2,y2=2,x3=-2,y3=-2,x4=2,y4=-2,x,y,d1,d2,d3,d4; printf(\请输入一个点(x,y):\ scanf(\

d1=(x-x4)*(x-x4)+(y-y4)*(y-y4); /*求该点到各中心点距离*/ d2=(x-x1)*(x-x1)+(y-y1)*(y-y1); d3=(x-x2)*(x-x2)+(y-y2)*(y-y2); d4=(x-x3)*(x-x3)+(y-y3)*(y-y3);

if (d1>1 && d2>1 && d3>1 && d4>1) h=0; /*判断该点是否在塔外*/ printf(\该点高度为 %d\\n\ return 0; } 5-3

#include int main() {

int p,r,n,m,temp;

printf(\请输入两个正整数n,m:\ scanf(\ if (n

temp=n; n=m; m=temp; }

p=n*m; while(m!=0) {

r=n%m; n=m;