Math operation cilinder

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

int main()
{
    float r, h, S, V;
    printf("Enter radius: ");
    scanf("%f", &r);
    printf("Enter height: ");
    scanf("%f", &h);

    if (r <= 0 || h <= 0)
    {
        printf("Numbers can't be negative!\n");
        return 1;
    }

    S = M_PI * r *r;
    V = M_PI * r * r * h;
    printf("S = %.2f\n", S);
    printf("V = %.2f\n", V);
    return 0;
}