C :

#include<stdio.h>
int main()
{
	int n,i=0;
	scanf("%d",&n);
	while(n!=1)
	{
		if(n%2==0)
		{
			n=n/2;
		}
		else
		{
			n=n*3+1;
		}
		i++;
	}
	printf("%d\n",i);
}

C++ :

#include<stdio.h>
int main()
{
    int n,i=0;
    scanf("%d",&n);
    while(n!=1)
    {
    	if(n%2==0)
    	{
    		n=n/2;
		}
		else
		{
			n=3*n+1;
		}
		i++;
	}
	printf("%d",i);
    return 0;
}

Java :

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int num = 0;
        while(n!=1){
            if (n%2==0){
                n = n/2;
                num++;
            }
            else{
                n = 3*n+1;
                num++;
            }
        }
        System.out.println(num);
    }
}

Python :

# coding=utf-8
#!/usr/bin/python2
import sys
import re
import math
 

n=int(input())
count=0


while n!=1:
    if(n%2==0):
        n=n/2
        count=count+1
    else:
        n=n*3+1
        count=count+1


print count

C# :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp2
{
    internal class Program
    {
        static void Main()
        {

            int num = 0;

            int n = Convert.ToInt32(Console.ReadLine());
            while (n !=1) {
            if (n%2==0) {
                    n /= 2;
                }
            else { n=n*3+1; }
                num += 1;
            }
            

            Console.WriteLine(num); 
            Console.ReadKey();
     
        }
    }
}