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Convert Binary to Decimal
In this section, you will learn how to convert a binary number into a decimal number.

Convert Binary to Decimal

In this section, you will learn how to convert a binary number into a decimal number. The java.lang package provides the facility to convert the integer data into the binary to decimal.

Code Description:

In this program, you will learn the use of parseLong() method. Define a class "BinaryToDecimal" using the parseLong() method. This method is used to parse the string argument as a signed decimal long. This method has been used for converting a long to a string and a String to a long.

Here is the code of this program:


import java.lang.*;

import java.io.*;



public class BinaryToDecimal{

  public static void main(String[] args) throws IOException{

    BufferedReader bf= new BufferedReader(new InputStreamReader(System.in));

    System.out.print("Enter the Binary value: ");

    String str = bf.readLine();

    long num = Long.parseLong(str);

    long rem;

    while(num > 0){

      rem = num % 10;

      num = num / 10;

      if(rem != 0 && rem != 1){

        System.out.println("This is not a binary number.");

        System.out.println("Please try once again.");

        System.exit(0);

      }

    }

    int i= Integer.parseInt(str,2);

    System.out.println("Decimal:="+ i);

  }

}

Download this program.

Output of this program:

C:\corejava>java BinaryToDecimal
Enter the Binary value:
10010
Decimal:=18
C:\corejava>_

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