How to convert Decimal number to Binary number in Java?

Problem Description :

Write a program in Java that converts Decimal number to Binary number.

Java program that converts decimal number to binary number.

Decimal to Binary conversion

Concept :

Click here to learn how to convert decimal number to binary number Mathematically. We are using Method 1 : Short Division by Two with Remainder.

Java Program :

package com.javamultiplex.baseconversion; import java.util.Scanner; /** * * @author Rohit Agarwal * @category Base Conversion * @problem Convert Decimal to Binary */ public class DecimalToBinary { public static void main(String[] args) { Scanner input = null; try { input = new Scanner(System.in); System.out.println("Enter decimal number : "); String number = input.next(); if (isDecimalNumber(number)) { String binary = getBinaryNumber(number); System.out.println("Binary number : " + binary); } else { System.out.println("Please enter valid decimal number."); } } finally { if (input != null) { input.close(); } } } private static String getBinaryNumber(String number) { // Converting String to Integer. int decimal = Integer.parseInt(number); int remainder = 0; StringBuilder binary = new StringBuilder(); while (decimal != 0) { remainder = decimal % 2; // Converting Integer to String and adding into StringBuilder. binary.append(String.valueOf(remainder)); decimal = decimal / 2; } // Reverse String using library function of StringBuilder class. return binary.reverse().toString(); } private static boolean isDecimalNumber(String number) { // Regular expression that matches String containing only digits [0-9]. String pattern = "^[0-9]+$"; boolean result = false; if (number.matches(pattern)) { result = true; } return result; } }

Output:

Output - How to convert Decimal number to Binary number in Java?

References :

https://en.wikipedia.org/wiki/Regular_expression

http://docs.oracle.com/javase/7/docs/api/java/lang/String.html

https://docs.oracle.com/javase/7/docs/api/java/lang/StringBuilder.html

https://docs.oracle.com/javase/7/docs/api/java/lang/Integer.html

Thank you friends, I hope you have clearly understood the solution of this problem. If you have any doubt, suggestion or query please feel free to comment below. You can also discuss this solution in our forum.

Tags : Conversion problems, Decimal to Binary, Solution in Java, Regular expressions, String, StringBuilder, while loop, if else statement.

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How to convert Decimal number to Binary number in Java?

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