#include <stdio.h>

#define FRACTION 4.0f/3.0f
#define PI 3.14

int main(void)
{
    float radius, volum, ferdig;
    printf("Skriv inn radius: ");
    scanf("%f", &radius);
    volum=FRACTION * PI * radius * radius * radius;
    printf("Volum: %f\n" volum);

    return 0;
}