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Java Exercises: Add two binary numbers

Java Basic: Exercise-17 with Solution

Write a Java program to add two binary numbers.

In digital electronics and mathematics, a binary number is a number expressed in the base-2 numeral system or binary numeral system. This system uses only two symbols: typically 1 (one) and 0 (zero).

Test Data:
Input first binary number: 100010
Input second binary number: 110010

Pictorial Presentation:

Java: Add two binary numbers

Sample Solution:

Java Code:

import java.util.Scanner;
public class Exercise17 {
 public static void main(String[] args)
 {
  long binary1, binary2;
  int i = 0, remainder = 0;
  int[] sum = new int[20];
  Scanner in = new Scanner(System.in);

  System.out.print("Input first binary number: ");
  binary1 = in.nextLong();
  System.out.print("Input second binary number: ");
  binary2 = in.nextLong();

  while (binary1 != 0 || binary2 != 0) 
  {
   sum[i++] = (int)((binary1 % 10 + binary2 % 10 + remainder) % 2);
   remainder = (int)((binary1 % 10 + binary2 % 10 + remainder) / 2);
   binary1 = binary1 / 10;
   binary2 = binary2 / 10;
  }
  if (remainder != 0) {
   sum[i++] = remainder;
  }
  --i;
  System.out.print("Sum of two binary numbers: ");
  while (i >= 0) {
   System.out.print(sum[i--]);
  }
   System.out.print("\n");  
 }
}

Sample Output: 

Input first binary number: 100010                                                                             
Input second binary number: 110010                                                                            
Sum of two binary numbers: 1010100

Flowchart:

Flowchart: Java exercises: Add two binary numbers

Java Code Editor:

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Java: Tips of the Day

countOccurrences

Counts the occurrences of a value in an array.

Use Arrays.stream().filter().count() to count total number of values that equals the specified value.

public static long countOccurrences(int[] numbers, int value) {
    return Arrays.stream(numbers)
            .filter(number -> number == value)
            .count();
}

Ref: https://bit.ly/3kCAgLb