task8

`#include<stdio.h>

include<stdlib.h>

include<math.h>

int main()
{
int a,b,c;
double s,area;

while(scanf("%d%d%d",&a,&b,&c)!=EOF)

{ s=(a+b+c)/2;
area=sqrt(s(s-a)(s-b)*(s-c));
printf("面积为%.3f",area);
}
system("pause");
return 0;
}`