Java Convert Decimal to Binary

In this source code example, we will write a Java program that converts any Decimal number to a Binary number.
We show you two ways to convert any Decimal number to a Binary number:
  1. The first method converts a decimal number to a binary number using a conventional algorithm.
  2. The second method converts a decimal number to a binary number using a bitwise algorithm
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Convert Decimal number to Binary number using a Conventional Algorithm

The first method converts a decimal number to a binary number using a conventional algorithm:
package net.sourcecodeexamples.java.Conversions; import java.util.Scanner; /**  * This class converts a Decimal number to a Binary number  *   * @author https://www.sourcecodeexamples.net  *  */ class DecimalToBinary { /**  * Main Method  *  * @param args Command Line Arguments  */ public static void main(String args[]) { conventionalConversion(); } /**  * This method converts a decimal number  * to a binary number using a conventional  * algorithm.  */ public static void conventionalConversion() { int n, b = 0, c = 0, d; Scanner input = new Scanner(System.in); System.out.printf("Conventional conversion.%n Enter the decimal number: "); n = input.nextInt(); while (n != 0) { d = n % 2; b = b + d * (int) Math.pow(10, c++); n /= 2; } //converting decimal to binary System.out.println("\tBinary number: " + b); input.close(); } }

Output

Conventional conversion. Enter the decimal number: 20 Binary number: 10100

Convert Decimal number to Binary number using a Bitwise Algorithm

The second method converts a decimal number to a binary number using a bitwise algorithm:
package net.sourcecodeexamples.java.Conversions; import java.util.Scanner; /**  * This class converts a Decimal number to a Binary number  *   * @author https://www.sourcecodeexamples.net  *  */ class DecimalToBinary { /**  * Main Method  *  * @param args Command Line Arguments  */ public static void main(String args[]) { bitwiseConversion(); } /**  * This method converts a decimal number  * to a binary number using a bitwise  * algorithm  */ public static void bitwiseConversion() { int n, b = 0, c = 0, d; Scanner input = new Scanner(System.in); System.out.printf("Bitwise conversion.%n Enter the decimal number: "); n = input.nextInt(); while (n != 0) { d = (n & 1); b += d * (int) Math.pow(10, c++); n >>= 1; } System.out.println("\tBinary number: " + b); input.close(); } }

Output

Bitwise conversion. Enter the decimal number: 20 Binary number: 10100
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Checkout all Java programs at 50+ Java Programs 



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