Write a program that calculates and displays the area of a triangle whose lengths must be entered on all three sides. Use the formula:

$$S^2 = P*(P-A)*(P-B)*(P-C)$$

where A, B, C are the lengths of the three sides (type int) and P the half-perimeter of the triangle.

#include <stdio.h>
#include <math.h>
int main()
{
    int A, B, C;
    double P;
    
    printf("Enter the 3 sides of a triangle: ");
    scanf("%d %d %d", &A,&B,&C);
    
    P=((double)A+B+C)/2;
    
    printf("Area = %f\n", sqrt(P*(P-A)*(P-B)*(P-C))   );
    
    return 0;
}