2

` #include<stdio.h>

include<stdlib.h>

include<math.h>

int main()
{
double s,S;
int a,b,c;
while(scanf("%d%d%d",&a,&b,&c)!=EOF)
{
s=(a+b+c)/2.0;
S=sqrt(s(s-a)(s-b)*(s-c));

     printf("a=%d,b=%d,c=%d,area=%.3f\n",a,b,c,S);
 }
 system("pause:");
  
 return 0;

}
`