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Python/C/C++/JAVA

Basic Practice Programs with Code and Concept

By D.S

Factorial of any Number

In this example, we're going to be discussing how to calculate the factorial of a number using different programming languages. The factorial of a non-negative integer n, denoted by n!, is the product of all positive integers less than or equal to n. For example, the factorial of 5 (denoted as 5!) is 5 * 4 * 3 * 2 * 1 = 120.

(a.) C Code

#include  <stdio.h>

int main() {
    int num, i;
    unsigned long long factorial = 1;

    printf("Enter a number: ");
    scanf("%d", &num);

    // Check if the number is negative, positive, or zero
    if (num < 0)
        printf("Factorial of a negative number doesn't exist.");
    else {
        for (i = 1; i <= num; ++i) {
            factorial *= i;
        }
        printf("Factorial of %d = %llu", num, factorial);
    }

    return 0;
}
Output:-
Enter a number: 5
Factorial of 5 = 120

(b.) C++ Code

#include  <iostream>

using namespace std;

int main() {
    int num, i;
    unsigned long long factorial = 1;

    cout << "Enter a number: ";
    cin >> num;

    // Check if the number is negative, positive, or zero
    if (num < 0)
        cout << "Factorial of a negative number doesn't exist.";
    else {
        for (i = 1; i <= num; ++i) {
            factorial *= i;
        }
        cout << "Factorial of " << num << " = " << factorial;
    }

    return 0;
}
Output:-
Enter a number: 5
Factorial of 5 = 120

(c.) Python Code

def factorial(num):
    if num == 0:
        return 1
    else:
        return num * factorial(num - 1)

num = int(input("Enter a number: "))
print("Factorial of", num, "=", factorial(num))
Output:-
Enter a number: 5
Factorial of 5 = 120

(d.) Java Code

import java.util.Scanner;

public class Factorial {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter a number: ");
        int num = scanner.nextInt();
        long factorial = 1;

        // Calculate factorial
        for (int i = 1; i <= num; ++i) {
            factorial *= i;
        }
        System.out.println("Factorial of " + num + " = " + factorial);
    }
}
Output:-
Enter a number: 5
Factorial of 5 = 120