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Implementation of factorial() Function

To implement a factorial() function in C that calculates the factorial of a non-negative integer, you can create a recursive function. Here's an example of how to implement the factorial() function:

Example:


#include <stdio.h>

// Function to calculate the factorial of a non-negative integer
unsigned long long factorial(int n) {
    if (n == 0) {
        return 1; // Base case: factorial of 0 is 1
    } else {
        return n * factorial(n - 1); // Recursive case
    }
}

int main() {
    int number = 5;
    unsigned long long result = factorial(number);

    printf("Factorial of %d is %llu\n", number, result);

    return 0;
}

In this example:

  • The factorial() function takes an integer n as its parameter and calculates the factorial recursively. The base case is when n is 0, in which case the function returns 1. In the recursive case, it multiplies n by the factorial of n - 1.
  • In the main() function, a number (5 in this case) is passed to the factorial() function, and the result is stored in the result variable.
  • Finally, the program prints the result, showing the factorial of the input number.

Output:


Factorial of 5 is 120

You can use this factorial() function to calculate the factorial of any non-negative integer by passing it as an argument to the function. Note that the result is of type unsigned long long to handle larger factorials without overflowing.

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