area tringle

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