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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If you have any feedback or suggestion please feel free to drop in blow comment box.
If you have any feedback or suggestion please feel free to drop in blow comment box.