Java/07-Java-Programs/049-Binary-to-Decimal.java at main · shaikbasha-dev/Java · GitHub

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* ============================================================================

* Program Name : Binary to Decimal

* File Name : 049-Binary-to-Decimal.java

* Class Name : BinaryToDecimal

* Description:

* This program accepts a binary number from the user and converts

* it into its decimal equivalent.

* Objective:

* - Understand user input using the Scanner class.

* - Learn how to convert binary numbers to decimal.

* - Practice using the while loop and arithmetic operators.

* Author : Shaik Mahaboob Basha

* Repository : 01-Core-Java

* Folder : 08-Java-Programs

* ============================================================================

import java.util.Scanner;

public class BinaryToDecimal {

// The main() method is the entry point of every Java application.

public static void main(String[] args) {

// Create a Scanner object to read input from the keyboard.

Scanner scanner = new Scanner(System.in);

// Ask the user to enter a binary number.

System.out.print("Enter a Binary Number: ");

// Read the binary number entered by the user.

long binaryNumber = scanner.nextLong();

// Store the original binary number.

long originalBinary = binaryNumber;

// Declare and initialize a variable to store the decimal number.

int decimalNumber = 0;

// Declare and initialize the power of 2.

int power = 1;

// Declare a variable to validate the binary number.

boolean isValidBinary = true;

// Process each digit of the binary number.

while (binaryNumber != 0) {

// Extract the last digit.

int digit = (int) (binaryNumber % 10);

// Check whether the digit is valid.

if (digit != 0 && digit != 1) {

// Mark the binary number as invalid.

isValidBinary = false;

// Exit the loop.

break;

}

// Calculate the decimal value.

decimalNumber = decimalNumber + (digit * power);

// Update the power of 2.

power = power * 2;

// Remove the last digit from the binary number.

binaryNumber = binaryNumber / 10;

}

// Check whether the entered binary number is valid.

if (isValidBinary) {

// Display the original binary number.

System.out.println("Binary Number : " + originalBinary);

// Display the decimal equivalent.

System.out.println("Decimal Number: " + decimalNumber);

// Example Output:

// Enter a Binary Number: 11001

// Binary Number : 11001

// Decimal Number: 25

} else {

// Display an error message.

System.out.println("Invalid Binary Number.");

// Example Output:

// Invalid Binary Number.

}

// Close the Scanner object to release system resources.

scanner.close();

}

Java/07-Java-Programs/049-Binary-to-Decimal.java at main · shaikbasha-dev/Java · GitHub

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