Algoritma dan program Permutasi nPr

#include <iostream>

/* run this program using the console pauser or add your own getch, system("pause") or input loop */
using namespace std;

int faktorial(int x){
    int i=1, f;
    f=1;
    while(i<=x){
        f=f*i; i++;
    } return (f);
}

int main(int argc, char** argv) {
    int n, r, p, permutasi;
    cout<<"Menghitung Permutasi "<<endl;
    cout<<"Masukkan nilai n = "; cin>>n;
    cout<<"Masukkan nilai r = "; cin>>r;
    p=n-r;
    permutasi=faktorial(n)/faktorial(p);
    cout<<"Hasil Permutasi nPr = "<<permutasi;
    return 0;
}

Raptor: