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Java program for binary to decimal conversion

By Chaitanya Singh | Filed Under: Java Examples

There are two following ways to convert binary number to decimal number:

1) Using Integer.parseInt() method of Integer class.
2) Do conversion by writing your own logic without using any predefined methods.

Method 1: Binary to Decimal conversion using Integer.parseInt() method

import java.util.Scanner;
class BinaryToDecimal {
    public static void main(String args[]){
       Scanner input = new Scanner( System.in );
       System.out.print("Enter a binary number: ");
       String binaryString =input.nextLine();
       System.out.println("Output: "+Integer.parseInt(binaryString,2));
    }
}

Output:

Enter a binary number: 1101
Output: 13

Method 2: Conversion without using parseInt

public class Details {
 
  public int BinaryToDecimal(int binaryNumber){
 
    int decimal = 0;
    int p = 0;
    while(true){
      if(binaryNumber == 0){
        break;
      } else {
          int temp = binaryNumber%10;
          decimal += temp*Math.pow(2, p);
          binaryNumber = binaryNumber/10;
          p++;
       }
    }
    return decimal;
  }
 
  public static void main(String args[]){
    Details obj = new Details();
    System.out.println("110 --> "+obj.BinaryToDecimal(110));
    System.out.println("1101 --> "+obj.BinaryToDecimal(1101));
    System.out.println("100 --> "+obj.BinaryToDecimal(100));
    System.out.println("110111 --> "+obj.BinaryToDecimal(110111));
  }
}

Output:

110 --> 6
1101 --> 13
100 --> 4
110111 --> 55

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Comments

  1. rafikh says

    April 13, 2016 at 2:08 PM

    Please create notes for struts and other framework

    Reply
  2. jaga says

    July 21, 2016 at 12:08 PM

    I was about to know the Method 2 program .How to add or sum all the values that are displayed in console or command prompt
    eg:
    110 –> 6
    1101 –> 13
    100 –> 4
    110111 –> 55 i should get the decimal value at last

    Reply
  3. esousa says

    August 7, 2016 at 6:59 PM

    Thanks dude. This help-me a lot…..great job.

    Reply
  4. Dimitris says

    April 2, 2017 at 11:48 PM

    You need to cast (int) before Math.pow, as java returns a double() for this expression

    Reply
  5. Dimitris says

    April 2, 2017 at 11:51 PM

    Sorry , i was eager not to see the int temp inside the if. Well done mate :))

    Reply
  6. George says

    October 16, 2017 at 10:33 AM

    I wonder how to deal with negative powers in the input.
    Example if you want to convert the decimal 0.001 to binary.

    Reply

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