Created
September 20, 2017 11:43
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Decimal to Binary Converter
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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; | |
} | |
} |
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