Java Program to subtract two binary numbers using ParseInt

Program

import java.util.Scanner;
public class SubtractTwoBinaryNumbersUsingParseInt {
    public void subtractBinaryNumbers(String binaryNum1, String binaryNum2)
    {
        int num1 = Integer.parseInt(binaryNum1, 2);
        int num2 = Integer.parseInt(binaryNum2, 2);
        int difference = num1 - num2;
        System.out.println(Integer.toBinaryString(difference));
    }
    public static void main(String[] args)
    {
        SubtractTwoBinaryNumbersUsingParseInt subtractTwoBinaryNumbersUsingParseInt= new SubtractTwoBinaryNumbersUsingParseInt();
        Scanner reader = new Scanner(System.in);
        System.out.print("Enter the first binary number: ");
        String binaryNum1 = reader.nextLine();
        System.out.print("Enter the second binary number: ");
        String binaryNum2 = reader.nextLine();
        System.out.print("Difference of two numbers is: ");
        subtractTwoBinaryNumbersUsingParseInt.subtractBinaryNumbers(binaryNum1, binaryNum2);
    }
}

This Java program subtracts two binary numbers by converting them into decimal format, performing the subtraction, and then converting the result back to binary.

Use Case:

This program is ideal when you need to subtract binary numbers in a straightforward manner, focusing on converting to decimal, performing arithmetic, and converting back to binary without handling low-level bit manipulation.

1. Input:

   • The user is prompted to enter two binary numbers as strings using the Scanner class.

2. Conversion:

   • Integer.parseInt(binaryNum, 2):
     • Converts the input binary strings into decimal integers.
     • The 2 argument specifies that the input is in binary format.

3. Subtraction:

   • The two converted decimal numbers are subtracted.

4. Result Conversion:

   • Integer.toBinaryString(difference):
     • Converts the resulting decimal difference back into its binary representation.

5. Output:

   • The program prints the binary form of the difference.

6. Example Execution:

   • Example:

     Enter the first binary number: 1011
     Enter the second binary number: 0111
     Difference of two numbers is: 100
     

   • Steps:
     • Convert 1011 (binary) to 11 (decimal).
     • Convert 0111 (binary) to 7 (decimal).
     • Subtract 11 - 7 = 4 (decimal).
     • Convert 4 (decimal) to 100 (binary).

Key Features:

• Simplicity:
  • Uses Integer.parseInt and Integer.toBinaryString for efficient conversion between binary and decimal.
• Direct Approach:
  • The program directly handles the subtraction after converting both binary inputs to integers, avoiding manual binary subtraction.
• Accuracy:
  • This approach ensures accurate results without the complexity of performing binary subtraction manually.

Output

$ javac SubtractTwoBinaryNumbersUsingParseInt.java
$ java SubtractTwoBinaryNumbersUsingParseInt
Enter the first binary number: 110111
Enter the second binary number: 101010
Difference of two numbers is: 1101