area of the tringle

#include<stdio.h>
int main()
{
  int a,b,c;
 float area,s;
printf("Enter three side of tringle : ");
scanf("%d %d %d",&a,&b,&c);
s=(a+b+c)/2;
s=s*(s-a)*(s-b)*(s-c);
area=sqrt(s);
printf("area of the tringle is=%f",area);
return 0;
}