Decimal to Binary conversion Programs in java

               Numbers are magical in mathematics. Decimal numbers are whole numbers, where the binary numbers contain 0’s and 1’s.

How to implement?

There are two methods to implement this program in java.

1. 1.      Using user defined code
2. 2.      Using Built-in function.

Let us implement this program in both ways.

1.Using user defined code:

It has following steps.

• ·       First, read the input from the user.
• ·       Using a while loop, until the decimal_no is greater than zero, repeat the process.
• ·       using mod function, find the remainder using mod by 2.
• ·       Next, decimal_no is divided by 2.
• ·       Finally, print the binary_no.

Program:  

 import java.util.Scanner;

public class DecimalToBinaryEg1 {

    public static void main(String[] args) {

        Scanner s1 = new Scanner(System.in);

        // Read the Decimal number as input

        System.out.print("Enter the decimal number: ");

        int decimal_no = s1.nextInt();

        String binary_no = "";

        // Let us Convert the logic

        while (decimal_no > 0) {

            binary_no = (decimal_no % 2) + binary_no;

            decimal_no = decimal_no / 2;         

        }

        // Display the Binary number

        System.out.println("Binary number of decimal number: " + binary_no);

        s1.close();

    }

}

Output:

Compile and run the program to get the output.

C:\raji\blog>javac DecimalToBinaryEg1.java

C:\raji\blog>java DecimalToBinaryEg1

Enter the decimal number: 78

Binary number of decimal number: 1001110

This is the program to convert the decimal number into binary number using user defined code.

2.Using Built-in function:

If you want to use the built-in function to convert the decimal number into binary number, the below program uses the function “toBinaryString()”.

The code is given below.

import java.util.Scanner;

public class DecimalToBinaryEg {

    public static void main(String[] args) {

        Scanner s1 = new Scanner(System.in);

        // Get the Decimal number as input

        System.out.print("Enter the decimal number: ");

        int decimal_no = s1.nextInt();

        // Conversion of decimal to binary using built-in function

        String binary_no = Integer.toBinaryString(decimal_no);

        // Print the Binary representation

        System.out.println("The converted Binary number is: " + binary_no);

        s1.close();

    }

}

While running this program, you get the below output.

C:\raji\blog>javac DecimalToBinaryEg.java

C:\raji\blog>java DecimalToBinaryEg

Enter the decimal number: 67

The converted Binary number is: 1000011

These are the two ways to implement the conversion of decimal number into binary number. Hope this code is useful to you.