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Program to Find Factorial of n using While loop

Program to Find Factorial of n using While loop

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  • Write a program to Find Factorial of n using While loop in C
  • Write a program to Find Factorial of n using While loop in C++
  • Write a program to Find Factorial of n using While loop in Python
  • Write a program to Find Factorial of n using While loop in PHP
  • Write a program to Find Factorial of n using While loop in Java
  • Write a program to Find Factorial of n using While loop in Java Script
  • Write a program to Find Factorial of n using While loop in C#

Explanation:

Using a for loop, you multiply each integer from 1 to n to obtain the factorial of a given number n. The definition of a number n’s factorial is:

The formula 𝑛! = 𝑛 × (𝑛 −1) × (𝑛 −2) × ⋯ × 1
(n−1) × (n−2) × ⋯ × 1 = n!

Logic

  1. Initialize a variable factorial to 1.
  2. Use a While loop to iterate through numbers from 1 to n.
  3. Multiply factorial by the current number in each iteration.
  4. Print the final value of factorial.

Program to Find Factorial of n using While loop

#include <stdio.h>

int main() {
    int n, fact = 1;
    printf("Enter a number: ");
    scanf("%d", &n);

    while (n > 1) {
        fact *= n;
        n--;
    }

    printf("Factorial: %d\n", fact);
    return 0;
}

#include <iostream>
using namespace std;

int main() {
    int n, fact = 1;
    cout << "Enter a number: ";
    cin >> n;

    while (n > 1) {
        fact *= n;
        n--;
    }

    cout << "Factorial: " << fact << endl;
    return 0;
}

n = int(input("Enter a number: "))
fact = 1

while n > 1:
    fact *= n
    n -= 1

print(f"Factorial: {fact}")


<?php
$n = (int)readline("Enter a number: ");
$fact = 1;

while ($n > 1) {
    $fact *= $n;
    $n--;
}

echo "Factorial: $fact\n";
?>


import java.util.Scanner;

public class Factorial {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.print("Enter a number: ");
        int n = sc.nextInt();
        int fact = 1;

        while (n > 1) {
            fact *= n;
            n--;
        }

        System.out.println("Factorial: " + fact);
        sc.close();
    }
}


let n = parseInt(prompt("Enter a number: "));
let fact = 1;

while (n > 1) {
    fact *= n;
    n--;
}

console.log(`Factorial: ${fact}`);


using System;

class Program {
    static void Main() {
        Console.Write("Enter a number: ");
        int n = int.Parse(Console.ReadLine());
        int fact = 1;

        while (n > 1) {
            fact *= n;
            n--;
        }

        Console.WriteLine($"Factorial: {fact}");
    }
}

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