Algorithm

  1. Input:

    • Take an input number (let's call it n).

  2. Initialization:

    • Initialize a variable factorial to 1.

  3. Loop:

    • Use a loop (for or while) to iterate from 1 to n.
      • At each iteration, multiply the current value of factorial by the loop variable.

  4. Output:

    • The final value of factorial is the factorial of the input number.

 

Code Examples

#1 Code Example- Find Factorial

Code - Javascript Programming

// program to find the factorial of a number

// take input from the user
const number = parseInt(prompt('Enter a positive integer: '));

// checking if number is negative
if (number  <  0) {
    console.log('Error! Factorial for negative number does not exist.');
}

// if number is 0
else if (number === 0) {
    console.log(`The factorial of ${number} is 1.`);
}

// if number is positive
else {
    let fact = 1;
    for (i = 1; i  < = number; i++) {
        fact *= i;
    }
    console.log(`The factorial of ${number} is ${fact}.`);
}
Copy The Code & Try With Live Editor

Output

x
–
+
cmd
Enter a positive integer: 5
The factorial of 5 is 120.
Advertisements

Demonstration

JavaScript Programing Example to Find the Factorial of a Number-DevsEnv

Previous
JavaScript Practice Example #3 - Assign 3 Variables and Print Good Way