Calculate nCr using function

#include <stdio.h>

int factorial(int n);

int main()
{
    int n, r, ans;

    printf("Enter n: ");
    scanf("%d", &n);
    printf("Enter r: ");
    scanf("%d", &r);

    ans = factorial(n) / (factorial(n - r) * factorial(r));

    printf("nCr = %d\n", ans);

    return 0;
}

int factorial(int n)
{
    int fact = 1;
    int i;

    for(i = 1; i <= n; i++)
        fact *= i;

    return fact;
}