Java Program to Convert Binary to Decimal - The Coding Shala

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 Hey there, welcome back to another post. In this post, we will learn how to convert Binary to Decimal in Java.

Java Program to Convert Binary to Decimal

You have given a binary number, convert it to a decimal number.

Example: 

Input: 101
Output: 5

Input: 111
Output: 7

Binary to Decimal Conversion in Java

Approach

We will the below formula to convert binary to decimal:

decimal number = (2^0) * (rightmost digit) + (2^1) * (second rightmost digit) + ... 

for example: 

binary number = 110

decimal number 
          = 2^0 * 0 + 2^1 * 1 + 2^2 * 1
          = 1 * 0 + 2 * 1 + 4 * 1
          = 0 + 2 + 4
          = 6

Java Program: 

import java.util.Scanner;

/**
 * https://www.thecodingshala.com/
 */

public class Main {

    public static void printDecimal(int num) {
        int decimal = 0;
        int twos = 1; // 2^0 = 1 initial value

        while (num > 0) {
            int temp = num % 10;
            decimal += temp * twos;

            twos = twos * 2;
            num = num / 10;
        }

        System.out.println(decimal);
    }

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter a binary number, should only contains 0 and 1s");
        int num = sc.nextInt();

        System.out.println("The decimal of " + num + " is: ");
        printDecimal(num);
    }
}

Output: 

Enter a binary number, should only contains 0 and 1s
110
The decimal of 110 is: 
6

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