Java Exercises: Multiply two binary numbers
Java Basic: Exercise-18 with Solution
Write a Java program to multiply 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: 110
Input second binary number: 101
Sample Solution:
Java Code:
import java.util.Scanner;
public class Exercise18 {
public static void main(String[] args)
{
long binary1, binary2, multiply = 0;
int digit, factor = 1;
Scanner in = new Scanner(System.in);
System.out.print("Input the first binary number: ");
binary1 = in.nextLong();
System.out.print("Input the second binary number: ");
binary2 = in.nextLong();
while (binary2 != 0)
{
digit = (int)(binary2 % 10);
if (digit == 1)
{
binary1 = binary1 * factor;
multiply = binaryproduct((int) binary1, (int) multiply);
}
else
{
binary1 = binary1 * factor;
}
binary2 = binary2 / 10;
factor = 10;
}
System.out.print("Product of two binary numbers: " + multiply+"\n");
}
static int binaryproduct(int binary1, int binary2)
{
int i = 0, remainder = 0;
int[] sum = new int[20];
int binary_prod_result = 0;
while (binary1 != 0 || binary2 != 0)
{
sum[i++] = (binary1 % 10 + binary2 % 10 + remainder) % 2;
remainder = (binary1 % 10 + binary2 % 10 + remainder) / 2;
binary1 = binary1 / 10;
binary2 = binary2 / 10;
}
if (remainder != 0)
{
sum[i++] = remainder;
}
--i;
while (i >= 0)
{
binary_prod_result = binary_prod_result * 10 + sum[i--];
}
return binary_prod_result;
}
}
Sample Output:
Input the first binary number: 110 Input the second binary number: 101 Product of two binary numbers: 11110
Flowchart:

Flowchart : binaryproduct()

Java Code Editor:
Contribute your code and comments through Disqus.
Previous: Write a Java program to add two binary numbers.
Next: Write a Java program to convert a decimal number to binary number.
What is the difficulty level of this exercise?
Test your Programming skills with w3resource's quiz.
Java: Tips of the Day
getEnumMap
Converts to enum to Map where key is the name and value is Enum itself.
public static <E extends Enum<E>> Map<String, E> getEnumMap(final Class<E> enumClass) { return Arrays.stream(enumClass.getEnumConstants()) .collect(Collectors.toMap(Enum::name, Function.identity())); }
Ref: https://bit.ly/3xXcFZt
- Exercises: Weekly Top 12 Most Popular Topics
- Pandas DataFrame: Exercises, Practice, Solution
- Conversion Tools
- JavaScript: HTML Form Validation
- SQL Exercises, Practice, Solution - SUBQUERIES
- C Programming Exercises, Practice, Solution : For Loop
- Python Exercises, Practice, Solution
- Python Data Type: List - Exercises, Practice, Solution
- C++ Basic: Exercises, Practice, Solution
- SQL Exercises, Practice, Solution - exercises on Employee Database
- SQL Exercises, Practice, Solution - exercises on Movie Database
- SQL Exercises, Practice, Solution - exercises on Soccer Database
- C Programming Exercises, Practice, Solution : Recursion