Triangle

#include<stdio.h>
#include<math.h>

int main()
{
    float a, b, c, p, P, S;
    printf("Enter a: ");
    scanf("%f", &a);
    printf("Enter b: ");
    scanf("%f", &b);
    printf("Enter c: ");
    scanf("%f", &c);

    if (a <= 0 || b <= 0 || c <= 0 || a + b <= c || a + c <= b || b + c <= a)
    {
        printf("Invalid triangle!\n");
        return 1;
    }

    P = a + b + c;
    p = P / 2;
    S = sqrt(p*(p-a)*(p-b)*(p-c));
    printf("P = %.2f\n", P);
    printf("S = %.2f\n", S);
    return 0;
}