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Java Program to Convert Binary to Decimal

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In this tutorial, we will write a java program to convert binary to decimal using while loop. Before that, you must have knowledge of the following topics in java.

Binary number

The binary numbers are based on 0 and 1, so it is a base 2 number. They are the combination of 0 and 1. For example, 1001, 110101, etc.

Decimal Number

These are the numbers with a base of 10, which ranges from 0 to 9. These numbers are formed by the combination of 0 to 9 digits such as 24, 345, etc.

Here is the chart where for the equivalent value of decimal and binary numbers.

Decimal to binary

Example:

Input: 101
Output: 5

Input: 111
Output: 7

Now let us go through a program for the conversion of binary to decimal in java using while loop.

Before using a while loop, let us find the conversion of binary number to decimal number by using the parseInt() method of the Integer class.

import java.util.Scanner;

public class Main
{
  public static void main(String args[])
  {
    String bin;
    Scanner sc = new Scanner(System.in);

    System.out.println("Enter a binary number: ");
    bin = sc.nextLine();

    System.out.println("Equivalent Decimal Value: " + Integer.parseInt(bin, 2));
  }
}

Enter a binary number:
1001
Equivalent Decimal Value: 9

Java Program to Convert Binary to Decimal using while loop

import java.util.Scanner;

public class Main
{
  public static void main(String args[])
  {
    int bin, decimal = 0, i = 0;
    Scanner sc = new Scanner(System.in);

    System.out.println("Enter a binary number: ");
    bin = sc.nextInt();

    while (bin != 0)
    {
      decimal += ((bin % 10) *Math.pow(2, i));
      bin /= 10;
      i++;
    }

    System.out.println("Equivalent Decimal Value: " + decimal);
  }
}

Output:

Enter a binary number:
1010
Equivalent Decimal Value: 10

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