Question

#include<stdio.h> #include<math.h> int main(void) { int a,b,c,s; double area,perimeter; printf("Ent

谁能帮忙把程序改一下 这程序运行错误
#include<stdio.h>
#include<math.h>
int main(void)
{
int a,b,c,s;
double area,perimeter;
printf("Enter a,b,c;");
scanf("%lf",&a,&b,&c);
if(a+b>c,a+c>b,b+c>a){s=(a+b+c)/2;
area=sqrt(s*(s-a)*(s-b)*(s-c));
perimeter=a+b+c;}

else printf("These sides do not correspond to a valid triangl\n");

printf("f(%.2f)=%.2f\n",a,b,c,area,perimeter);

return 0;
}

Answer 1

#include<stdio.h>
#include<math.h>
int main(void)
{
int a,b,c,s;
double area,perimeter;
printf("Enter a,b,c;");
scanf("%d%d%d",,&a,&b,&c);//scanf("%lf",&a,&b,&c);这里错了
if(a+b>c && a+c>b && b+c>a)//if(a+b>c,a+c>b,b+c>a)也出错了
{s=(a+b+c)*1.0/2;//这样才不会被当成整数运算而被截断
area=sqrt(s*(s-a)*(s-b)*(s-c));
perimeter=a+b+c;}

else printf("These sides do not correspond to a valid triangl\n");

printf("f(%.2f)=%.2f\n",a,b,c,area,perimeter);

return 0;
}