---
title: "Write a C# program to convert decimal number into binary number."  
description: "Write a C# program to convert decimal number into binary number."  
author: "Steilla Mitchel"  
published: 2021-11-30  
updated: 2021-11-30  
canonical: https://www.mindstick.com/forum/156865/write-a-c-sharp-program-to-convert-decimal-number-into-binary-number  
category: "c#"  
tags: ["c#"]  
reading_time: 1 minute  

---

# Write a C# program to convert decimal number into binary number.

Write a C# [program to convert](https://www.mindstick.com/forum/156866/write-a-c-sharp-program-to-convert-binary-number-into-decimal-number) [decimal](https://www.mindstick.com/forum/34709/please-write-a-program-for-decimal-to-binary-conversion-in-c-sharp) number into binary number.

## Replies

### Reply by Manish Sharma

**Following [C# program](https://www.mindstick.com/forum/156830/how-do-i-make-a-c-sharp-program-that-checks-for-given-array-by-user-which-elements-are-perfect-numbers) is to [convert](https://www.mindstick.com/forum/2093/configurationmanager-appsettings-convert-n-to-n-why) the Decimal number into Binary number,**

## Program:

```
using System;
public class Program
{
 public static void Main()
 {
    int i=1, binary=0;
    int rem, num;
  Console.WriteLine('Enter a decimal number');
  num=int.Parse(Console.ReadLine());
    while(num!=0)
    {
        rem=num%2;
       num=num/2;
       binary=binary+(rem*i);
       i=i*10;
    }
  Console.WriteLine('Binary number is :'+binary);
 }
}
```

## Output:

```
Enter a decimal number
20
Binary number is :10100
```


---

Original Source: https://www.mindstick.com/forum/156865/write-a-c-sharp-program-to-convert-decimal-number-into-binary-number

Copyright © MindStick Software Pvt. Ltd. This Markdown version is provided for developers, AI systems, and offline reading.