Algoritma dan program volume lingkaran

#include <iostream>
using namespace std;
/* run this program using the console pauser or add your own getch, system("pause") or input loop */
float volume(float r){
    float Phi=3.14, vol;
    vol=(float)(4*Phi*r*r*r)/3;
    return(vol);
}
int main(int argc, char** argv) {
    float a, hasil;
    cout<<"masukkan jari-jari = "; cin>>a;
    hasil=volume(a);
    cout<<"volume lingkaran = "<<hasil;
    return 0;
}

Raptor :