Program to calculate area of triangle in CPP

Source Code:
#include<iostream>
#include<math.h>
using namespace std;
int main()
{
int a,b,c,sum;
float s,area;
cout<<"Enter the values of a,b,c: ";
cin>>a>>b>>c;
sum=a+b+c;
s=float(sum)/2;
area=sqrt(s*(s-a)*(s-b)*(s-c));
cout<<"Area of the triangle: "<<area;
return 0;
}

Program Output: