In this post we are going to learn Swap two numbers with or without temporary variable in java
Example 1:
Java program to swap or exchange two numbers with using temporary variable.
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package com.kkjavatutorials.client; import java.util.Scanner; /** * @author KK JavaTutorials * Java program to swap or exchange two numbers with using temporary variable */ public class ClientTest1 { public static void main(String[] args) { try (Scanner scanner = new Scanner(System.in)) { //Take two numbers from keyboard using Scanner System.out.println("Enter first Number:"); int firstNumber = scanner.nextInt(); System.out.println("Enter second Number:"); int secondNumber = scanner.nextInt(); System.out.println("Both numbers before swapping."); System.out.println("firstNumber ="+firstNumber+",secondNumber = "+secondNumber); //Logic to swap two numbers with using temporary variable int temp = firstNumber; firstNumber = secondNumber; secondNumber = temp; System.out.println("-------------------------------------------"); System.out.println("Both numbers after swapping."); System.out.println("firstNumber ="+firstNumber+",secondNumber = "+secondNumber); } catch (Exception e) { System.out.println("Please Enter valid number.."); e.printStackTrace(); } } } |
Example 2:
Java program to swap or exchange two numbers without using temporary variable.
Here We make use of Arithmetic Operator(+,-)
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package com.kkjavatutorials.client; import java.util.Scanner; /** * @author KK JavaTutorials * Java program to swap or exchange two numbers without using temporary variable */ public class ClientTest2 { public static void main(String[] args) { try (Scanner scanner = new Scanner(System.in)) { // Take two numbers from keyboard using Scanner System.out.println("Enter first Number:"); int firstNumber = scanner.nextInt(); System.out.println("Enter second Number:"); int secondNumber = scanner.nextInt(); System.out.println("Both numbers before swapping."); System.out.println("firstNumber ="+firstNumber+",secondNumber = "+secondNumber); //Here we have Logic to swap two numbers without using temporary variable firstNumber = firstNumber + secondNumber; secondNumber = firstNumber - secondNumber; firstNumber = firstNumber - secondNumber; System.out.println("-------------------------------------------"); System.out.println("Both numbers after swapping."); System.out.println("firstNumber ="+firstNumber+",secondNumber = "+secondNumber); } catch (Exception e) { System.out.println("Please Enter valid number.."); e.printStackTrace(); } } } |
Example 3:
In this java program swapping two numbers using bitwise XOR operator. Before going though the program, lets understand what is a bitwise XOR operator?
A bitwise XOR basically compares corresponding bits of two operands and it returns 1 if they are not equal and 0(zero) if they are equal. For example:
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number1 = 11; /* equal to 00001011*/ number2 = 22; /* equal to 00010110 */ |
number1 ^ number2 compares corresponding bits of number1 and number2 and generates 1 if they are not equal, else it returns 0.
In our case it would return 29 which is equivalent to 00011101
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package com.kkjavatutorials.client; import java.util.Scanner; /** * @author KK JavaTutorials * Java program to swap or exchange two numbers using Bitwise XOR */ public class ClientTest3 { public static void main(String[] args) { try (Scanner scanner = new Scanner(System.in)) { // Take two numbers from keyboard using Scanner System.out.println("Enter first Number:"); int firstNumber = scanner.nextInt(); System.out.println("Enter second Number:"); int secondNumber = scanner.nextInt(); System.out.println("Both numbers before swapping."); System.out.println("firstNumber ="+firstNumber+",secondNumber = "+secondNumber); //Logic to swap two numbers Using Bitwise XOR firstNumber = firstNumber ^ secondNumber; secondNumber = firstNumber ^ secondNumber; firstNumber = firstNumber ^ secondNumber; System.out.println("-------------------------------------------"); System.out.println("Both numbers after swapping."); System.out.println("firstNumber ="+firstNumber+",secondNumber = "+secondNumber); } catch (Exception e) { System.out.println("Please Enter valid number.."); e.printStackTrace(); } } } |
I have tested above programs for few inputs as below. You may check for other input as well
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Enter first Number: 10 Enter second Number: 20 Both numbers before swapping. firstNumber =10,secondNumber = 20 ------------------------------------------- Both numbers after swapping. firstNumber =20,secondNumber = 10 Enter first Number: -100 Enter second Number: 900 Both numbers before swapping. firstNumber =-100,secondNumber = 900 ------------------------------------------- Both numbers after swapping. firstNumber =900,secondNumber = -100 |
That’s all about this topic How to swap or exchange two numbers with or without using any temporary variable in java
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