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Calculates X! factorial.
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| /** | |
| * factorial.c | |
| * Calculates X! factorial. | |
| * | |
| * @author Chi Zeng ([email protected]) | |
| * Sep. 24, 2013 | |
| */ | |
| #include <stdio.h> | |
| int factorial(int n) { | |
| if (n < 2) { | |
| // Our base case: 0! and 1! are 1. | |
| return 1; | |
| } | |
| return n * factorial(n - 1); | |
| } | |
| // Testing: lets find out what 5! is. | |
| int main() | |
| { | |
| int n = 5; | |
| int nFactorial = factorial(5); | |
| printf("%d! is %d.", n, nFactorial); | |
| } |
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