## [S1] Factorial

The factorial of an integer n! is defined as n! = 1*2*3*...*(n-1)*n, with 0! = 1.

##### Factorial

Write your own function factorial which takes as parameter an integer and returns an integer value. Your function must be named factorial.

Provide below the prototype and the body of this function.

### Information

 Author(s) Mathieu Xhonneux Deadline No deadline Submission limit No limitation Category Tags S1