Write a program to convert octal number to decimal number

Program

using System;

namespace ProgrammingQuestion
{
 class Program
 {
   static void Main(string[] args)
   {
     //Variable Declaration
     string octalNumberVal;
     int octalNumber, decimalNumber = 0, tempNumber, digit, power = 0;

     //User Input
     Console.Write("Enter Octal Number:");
     octalNumberVal = Console.ReadLine();
     octalNumber = Convert.ToInt32(octalNumberVal);
     
     //Octal to Decimal Logic
     tempNumber = octalNumber;
     while (tempNumber > 0)
     {
       digit = tempNumber % 10;
       decimalNumber = decimalNumber + digit * (int)Math.Pow(8, power);
       power++;
       tempNumber = tempNumber / 10;
     }
     
     //Print Result
     Console.WriteLine($"Decimal Number: {decimalNumber}");
     
     Console.Read();
   }
 }
}

Output

Enter Octal Number:3456
Decimal Number: 1838