Factorial n!(Logic in Programming)

During my College life as a computer science, I have encountered Factorial problems often at programming. I just want to share this, hope it help.

In mathematics, the factorial of a non-negative integer n, denoted by n!, is the product of all positive integers less than or equal to n. For example,

For example:

5! = 1 x 2 x 3 x 4 x 5 = 120


In Programming:

Note: 0! = 1

N = input;

ANS=1;

For ( ctr = N; ctr >=1; ctr--)
{
ANS = ANS * ctr;
}

PRINT(“Total: ” + ANS);