Write a C program

The factorial of a non-negative integer n is written n! (pronounced n factorial) and is defined as follows:

n! = n(n-1)(n-2).......1 (for values of n greater than or equal to 1) and n! = 1 (for n = 0). For example: 5! = 5 4 3 2 1, which is 120.

Write a program that reads a nonnegative integer and computes and prints its factorial.