How to write a factorial program in C++ using for loop

Certainly! Here's a simple C++ program that calculates the factorial of a number using a for loop:

#include <iostream>

int main() {
    int n;
    unsigned long long factorial = 1;

    std::cout << "Enter a positive integer: ";
    std::cin >> n;

    if (n < 0) {
        std::cout << "Factorial of a negative number doesn't exist.";
    } else {
        for(int i = 1; i <= n; ++i) {
            factorial *= i;
        }
        std::cout << "Factorial of " << n << " = " << factorial;    
    }

    return 0;
}

This program first prompts the user to enter a positive integer. Then, it uses a for loop to multiply the numbers from 1 up to the entered number to calculate the factorial. If the user enters a negative number, it outputs an appropriate message. Remember, the factorial of 0 is 1.

Comments

[Samir]

Thanks that's home helpful information.
But you could've made it less obvious that you used chatgpt 😂