C# Program to Convert Decimal to Binary


This is a C# Program to convert decimal to binary.

Problem Description

This C# Program Converts Decimal to Binary.

Problem Solution

Here the number in decimal form is obtained and is it repeatedly divided by 2 and its binary form is obtained.

Program/Source Code

Here is source code of the C# Program to Convert Decimal to Binary. The C# program is successfully compiled and executed with Microsoft Visual Studio. The program output is also shown below.

 * C# Program to Convert Decimal to Binary
using System;
class myclass
    static void Main()
        int num;
        Console.Write("Enter a Number : ");
        num = int.Parse(Console.ReadLine());
        int quot;
        string rem = "";
        while (num >= 1)
            quot = num / 2;
            rem += (num % 2).ToString();
            num = quot;
        string bin = "";
        for (int i = rem.Length - 1; i >= 0; i--)
            bin = bin + rem[i];
        Console.WriteLine("The Binary format for given number is {0}", bin);
Program Explanation

This C# program, we are declaring the variable ‘num’ and ‘bin’ Integer type. Declare the variable out type string which will assign the value ‘nothing’. Using while loop check the value of ‘num’ variable is greater than 0 and also greater than 1.


The variable bin will get the value of the operation, the variable num value % 2; the Mod is used to obtain a division residue. Divide the numbers to indicate next to the symbol %, this case the number 2, because 2 is the binary numbers base. Then after obtaining the first residue the variable ‘num’ will get its own value between 2.

Convert the value of ‘bin’ variable into String type to achieve the concatenation. The variable “out” is going to get the bin’s value (which contain the division residue) concatenated with the same variable “out” to keep accumulating the values of the others residues that generates while the “WHILE” runs. Finally assign to the textbox txt_bin, the value of the variable “out”.

Runtime Test Cases
Enter the Number : 3
Binary Format for the Given Number is : 11

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