Example: Factorial without Recursion using For Loop in C++

// Factorial without Recursion using For Loop
#include <iostream>

int main() {
    int number;
    long long factorial = 1; // Use long long for larger factorials

    // Step 1: Prompt user for input
    std::cout << "Enter a non-negative integer: ";
    std::cin >> number;

    // Step 2: Handle special cases for 0 and negative numbers
    if (number < 0) {
        std::cout << "Factorial is not defined for negative numbers." << std::endl;
    } else if (number == 0) {
        factorial = 1; // Factorial of 0 is 1
        std::cout << "The factorial of " << number << " is: " << factorial << std::endl;
    } else {
        // Step 3: Calculate factorial using a for loop
        for (int i = 1; i <= number; ++i) {
            factorial *= i; // Multiply factorial by current number
        }
        // Step 4: Display the result
        std::cout << "The factorial of " << number << " is: " << factorial << std::endl;
    }

    return 0;
}