Find the permutation of a given number using C (Beginner level)

 

Hey guys once again welcome to the Decoders blog, I hope you all are doing well and today I'm present with another logic but this time with something different it is a C logic which will help us to calculate the permutation value of  any given combination (using C). 

#include<stdio.h>

int fac(int num)

{

    int i=1,fac=1;

    while(i<=num)

    {

        fac=fac*i;

        i++;

    }

    return(fac);

}

int main()

{

    int num,r;

    printf("Enter the value of n and r:");

    scanf("%d%d",&num,&r);

    int numerator=fac(num);

    int denominator=fac((num-r));

    int answer=numerator/denominator;

    printf("The value of the factorial is %d",answer);

    return (0);

}