Question

C# programming. Comment/Explain the below code line by line. I am having a hard time following it.

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace Nth_prime

{

    class Program

    {

        public static bool isPrime(int number)

        {

            int counter = 0;

            for (int j = 2; j < number; j++)

            {

                if (number % j == 0)

                {

                    counter = 1;

                    break;

                }

            }

            if (counter == 0)

            {

                return true;

            }

            else

            {

                return false;

            }

        }

        static void Main(string[] args)

        {

            int num=1;

            int count = 0;

            Console.Write("Number : " );

            int n = Convert.ToInt32(Console.ReadLine());

            Console.WriteLine();

            while (true)

            {

                num++;

                if(isPrime(num))

                {

                    count++;

                }

                if(count==n)

                {

                    Console.WriteLine(n+"th prime number is "+num);

                    break;

                }

            }

            Console.ReadKey();

        }

    }

}

Answer 1

using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Nth_prime
{
// This program will read number from the user and prints the nth prime number
class Program
{
// this method will takes a number and checks if it is prime
public static bool isPrime(int number)
  
{
int counter = 0;
//iterating and finding the factors the for given number
for (int j = 2; j < number; j++){
if (number % j == 0){
counter = 1;
break;
}
}
//if it has 0 factors than it is prime
if (counter == 0){
return true;
}
else{
return false;
}
}
static void Main(string[] args){
int num=1;
int count = 0;
//reading number from the user
Console.Write("Number : " );
int n = Convert.ToInt32(Console.ReadLine());
Console.WriteLine();
// looping until we found the nth prime
while (true){
num++;
//checking if n is prime than n increase count
if(isPrime(num)){
count++;
}
//checking if it is nth count than printing that number
if(count==n){
Console.WriteLine(n+"th prime number is "+num);
break;
}
}
Console.ReadKey();
}
}
}

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