Factorial of Number in C-Programming

Factorial without Recursion

#include <stdio.h>
int main()
{
int n, i;
unsigned long long factorial = 1;

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

// show error if the user enters a negative integer
if (n < 0)
printf("Error! Factorial of a negative number doesn’t exist.");

else
{
for(i=1; i<=n; ++i)
{
factorial *= i; // factorial = factorial*i;
}
printf("Factorial of %d = %llu", n, factorial);
}

return 0;
}

Factorial of Number in C-Programming using Recursion

#include <stdio.h>
long int multiplyNumbers(int n);

int main()
{
int n;
printf("Enter a positive integer: ");
scanf("%d", &n);
printf("Factorial of %d = %ld", n, multiplyNumbers(n));
return 0;
}
long int multiplyNumbers(int n)
{
if (n >= 1)
return n*multiplyNumbers(n-1);
else
return 1;
}