C program to calculate factorial, permutation and combination in single Program.

#include <stdio.h>
long factorial(int);
long find_ncr(int x, int y);
long find_npr(int t, int s);
int main()
{
    int n, r;
    long nCr, nPr;
    printf("\n Enter n= ");
    scanf("%d",&n);
    printf("\n Enter r= ");
    scanf("%d",&r);
    nCr = find_ncr(n,r);
    nPr = find_npr(n,r);
    printf("\n 1) Combination of %dC%d = %d\n", n, r, nCr);
    printf("\n 2) Permutations of %dP%d = %d\n", n, r, nPr);
    return 0;
}
long find_ncr(int x, int y )
{
    long result;
    result=factorial(x)/factorial(x-y)*factorial(y);
    return (result);
}

long find_npr(int t, int s)
{
    long result1;
    result1=factorial(t)/factorial(t-s);
    return (result1);
}

long factorial(int A)
{
    int i;
    long r=1;
    for( i=1; i<=A; i++ )
        r=r*i;
    return (r);
}

***INPUT & OUTPUT***