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Module DEMO-32-90DEMO-C-32

Factorial

DEMO-C-32 • Programming in C

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Problem Statement

Write a function int factorial(int n) that returns the factorial of n.

n! = n * (n-1) * ... * 1.

0! = 1.

Input Format

A non-negative integer.

Output Format

The factorial value.

Sample Testcases

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Sample #1
Public sample
Input
5
Output
120
Explanation
5! = 120.
Sample #2
Public sample
Input
0
Output
1
Explanation
0! = 1.
Sample #3
Public sample
Input
3
Output
6
Explanation
3! = 6.

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