Factorial

• Define the signature of the function before it is being used.
• Then we can implement the function anywhere later.

#include<stdio.h>

int iterative_factorial(int n); int recursive_factorial(int n);

int main() { printf("Iterative factorial of 5: %d\n", iterative_factorial(5)); printf("Recursive factorial of 5: %d\n", recursive_factorial(5)); return 0; }

int iterative_factorial(int n) { int result = 1; for (int i = 1; i <= n; i++) { result *= i; } return result; }

int recursive_factorial(int n) { if (n == 0) { return 1; } else { return n * recursive_factorial(n - 1); } }