Numeral 1

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace _01.DecimalToBinary
{
    class DecimalToBinary
    {
        static void Main(string[] args)
        {
            //Console.WriteLine("Enter decimal number: ");
            //int enteredNumber = int.Parse(Console.ReadLine());

            int enteredNumber = 2-53;

            string binaryNumber = ConvertToBinary(enteredNumber);
            Console.WriteLine(binaryNumber);
            Console.WriteLine(Convert.ToString(enteredNumber,2));
        }

        private static string ConvertToBinary(int enteredNumber)
        {
            StringBuilder calculations = new StringBuilder();
            StringBuilder binary = new StringBuilder();
            int negative = 0; //var for negative numbers

            if (enteredNumber<0)
            {
                binary.Append(1);
                enteredNumber = enteredNumber * (-1); //make the value positive
                negative = 1; //remeber it is negative
            }
            //find the binary members
            while (enteredNumber!=0)
            {
                calculations.Append(enteredNumber % 2);
                enteredNumber /= 2;
            }
            //we got the binary memberse reversed so we have to reverse them
            //and get them in the right way
            char[] reverse = calculations.ToString().ToCharArray();
            calculations.Clear();//we will use this second time so we have to clear it
            int length = reverse.Length;

            for (int i = length-1; i >=0; i--) //starting from length-1 bevause it is reversed
            {
                calculations.Append(reverse[i]);
            }
            if (negative == 1)// if it is negative we should make the 32nd bit to 1
            {
                binary.Append(calculations.ToString().PadLeft(32 - negative, '0'));
            }
            else //if it isnot negative we just print it
            {
                binary.Append(calculations.ToString());
            }

            return binary.ToString();
        }
    }
}