Area of a triangle from its sides.

// cpp program to determine the area of a triangle from its sides..

#include "iostream"
using namespace std;

int main() {
    int x, y, z;
    cout << "Sides of that triangle : ";
    cin >> x >> y >> z;
    double p;
    if ((x+y) > z && (y+z) > x && (x+z) > y)
        p = (x + y + z) / 2.0;
    else {
        cout << "Invalid Input has given. Try again! \n" << endl;
        main();
    }
    double area = p * (p - x) * (p - y) * (p - z);
    cout << "Area : " << area << endl;
    return 0;
}