8

`#include<stdio.h>

include<math.h>

include<stdlib.h>

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

while(scanf("%f%f%f",&a,&b,&c)!=EOF)
{
s=(a+b+c)/2.0;
area=sqrt(s*(s-a)*(s-b)*(s-c));
printf("三角形的面积是:%.3f",area);
printf("\n");
}
system("pause");
return 0;

}
`