AreaOfRectangle

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

double setVars(double* w, double* h, double* S, double* P) {
    if(*w > 0 && *h > 0) {
        *S = *w * *h;
        *P = 2*(*w + *h);
        return 0;
    }
    return 2;
}

int main() {
    double w, h;
    double S = 0;
    double P = 0;

    while( scanf("%lf %lf", &w, &h) != EOF) {
        if(setVars(&w, &h, &S, &P) == 0) {
            printf("S: %lf cm2\n", S);
            printf("P: %lf cm\n", P);
        } else {
            fprintf(stderr, "Invalid rectangle sizes\n");
        }
    }

    return 0;

}