Implemented factorial in C.

[roeey777]

Signed-off-by: Eyal Royee [email protected]

[xlogix]

It would be great if you can add the description along with the issue number.
Feel free to use our contribution guidelines (https://github.com/fnplus/interview-techdev-guide/blob/master/CONTRIBUTING.md#how-to-contribute-an-implementation-code) for reference

[poojapatidar21]

include <stdio.h>
int main()
{
int n, i;
unsigned long long factorial = 1;
printf("Enter an integer: ");
scanf("%d",&n);
if (n < 0)
printf("Factorial of a negative number doesn't exist.");
else
{
for(i=1; i<=n; ++i)
{
factorial *= i;
}
printf("Factorial of %d = %llu", n, factorial);
}
return 0;
}