factorial

1function BracketCombinations(num) { 
2  return (1 / (num + 1)) * choose(2 * num, num);
3}
4
5function fact(num) {
6  let sum = 1;
7  for (let i = 1; i <= num; i++) {
8    sum *= i;
9  }
10  return sum;
11}
12
13function choose(num, k) {
14  return fact(num) / 2 * (fact(k) * 1 / fact(num - k));
15}

1unsigned long long factorial(unsigned long long num){
2
3    if(num<=0)
4        return 1;
5
6    return num * factorial(num-1);
7}

1// FACTORIAL 
2// 5! = 5 * 4 *3 * 2 *1 = 120 
3
4const number = 5;
5let fact =1 ;
6
7for(let i=number;i>=1;i--)
8{
9  console.log(i)
10  fact = fact * i;
11}
12console.log("FACTORIAL is :: ",fact);

1//Java program to find factorial of a numberimport java.util.Scanner;public class factorial{		public static void main(String[] args)	{		//scanner class declaration		Scanner sc = new Scanner(System.in);		//input from user		System.out.print("Enter a number : ");						int number = sc.nextInt();		if(number >= 0)		{			//declare a variable to store factorial			int fac = 1;			for(int i = number ; i >= 1 ; i--)			fac = fac * i;			//display the result			System.out.println("Factorial of "+number+" is "+fac);			//closing scanner class(not compulsory, but good practice)		}		else			System.out.println("Value is not defined, please re-enter the value");		sc.close();														}}

1#include<stdio.h>
2#include<conio.h>
3void main()
4{
5   int fact, i, n;
6   fact = 1;
7   printf("Enter the number\t");
8   scanf("%d" , &n);
9   for(i = 1; i <= n; i++)
10   {
11       fact = fact*i;
12   }
13   printf("Factorial of %d is %d", n , fact);
14   getch();
15}

1public static void  factorial(int num){
2
3    if(num<=0)
4        return 1;
5
6    return num * factorial(num-1);
7}

1// METHOD ONE
2const factorialNumber = num => {
3    let factorials = []
4    for(let i = 1; i <= num; i++) factorials.push(i)
5    return factorials.reduce((acc , curr) => acc * curr, 1)
6}
7
8// METHOD TWO
9const factorialNumber = num => {
10    let factorial = 1, i = 1
11    while(i <= num){ factorial *= i; i++ }
12    return factorial
13}
14// METHOD THREE
15function factorialNumber(num) {
16    if(num < 1) return 1
17    else return factorialNumber(num - 1) * num
18}