Find permutation .

Write a program for Find permutation.

# include<stdio.h>

int fact(int);

int main()

{

int n,r,P;

scanf("%d %d",&n,&r);

if(n>=r)

    {

    P=fact(n)/fact(n-r);

    printf("%dP%d=%d",n,r,P);

    return 0;

    }

}

int fact(int n)

    {

        int i,f=1;

    for(i=1;i<=n;i++)

    f=f*i;

        return (f);

    }

From: Me