## 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 &

Output

cmd
Enter a positive integer: 5
The factorial of 5 is 120.