Write a java program to convert binary to decimal number. In this tutorial, we are going to write a program which takes an input binary number and convert them into decimal number.

Let's assume, we have to convert 1000 to decimal number.

Decimal Number Conversion : 1 * 2

In this way, we can convert any binary number to decimal number.

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C program to convert binary to decimal number

We have discussed an algorithm to convert binary to decimal number. Let's write a code to implement them.

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### How to Convert Binary to Decimal Number

Let's assume, we have to convert 1000 to decimal number.

Decimal Number Conversion : 1 * 2

^{3 }+ 0 * 2^{2 }+ 0 * 2^{1 }+ 0 * 2^{0}= 8In this way, we can convert any binary number to decimal number.

Java program to find largest number in an array

C program to convert binary to decimal number

## Java Program to Convert Binary to Decimal Number

We have discussed an algorithm to convert binary to decimal number. Let's write a code to implement them.

import java.util.Scanner; public class BinaryToDecimal { public static void main(String[] args) { Scanner in = new Scanner(System.in); //Input binary number System.out.println("Enter a binary number"); Long num = in.nextLong(); Long count = 0L, sum = 0L, rem = 0L; //Whether a number is greater than 0 while(num > 0) { //find remainder rem = num % 10; //In case of binary number, //Remainder should be either 0 or 1 if(rem == 0 || rem == 1) { sum = (long) (sum + rem * Math.pow(2, count)); num = num / 10; } else { System.out.println("Invalid binary number"); break; } count++; } System.out.println(" Decimal number is " + sum); } }

**Output**

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