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Swap two numbers without using third variable

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instanceof java

Posts: 576
Nickname: instanceof
Registered: Jan, 2015

instanceof java is a java related one.
Swap two numbers without using third variable Posted: Dec 18, 2015 12:17 PM
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This post originated from an RSS feed registered with Java Buzz by instanceof java.
Original Post: Swap two numbers without using third variable
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1. Java Interview Program to Swap two numbers without using third variable in java



  1. package com.instaceofjava;
  2.  
  3. public class SwapTwoNumbers {
  4.  
  5. public static void main(String[] args) {
  6.  
  7. int number1=20;
  8. int number2=30;
  9.  
  10. System.out.println("Before Swapping");
  11. System.out.println("Value of number1 is :" + number1);
  12. System.out.println("Value of number2 is :" +number2); 
  13.  
  14. number1=number1+number2;
  15. number2=number1-number2;
  16. number1=number1-number2;
  17.  
  18. System.out.println("After Swapping");
  19. System.out.println("Value of number1 is :" + number1);
  20. System.out.println("Value of number2 is :" +number2);
  21.  
  22. }
  23. }
Output:

  1. Before Swapping
  2. Value of number1 is :20
  3. Value of number2 is :30
  4. After Swapping
  5. Value of number1 is :30
  6. Value of number2 is :20

2. Java Program to Swap two numbers by using division and multiplication.


  1. package com.instaceofjava;
  2.  
  3. public class SwapTwoNumbers {
  4.  
  5. public static void main(String[] args) {
  6.  
  7. int number1=20;
  8. int number2=30;
  9.  
  10. System.out.println("Before Swapping");
  11. System.out.println("Value of number1 is :" + number1);
  12. System.out.println("Value of number2 is :" +number2); 
  13.  
  14. number1=number1*number2;
  15. number2=number1/number2;
  16. number1=number1/number2;
  17.  
  18. System.out.println("After Swapping");
  19. System.out.println("Value of number1 is :" + number1);
  20. System.out.println("Value of number2 is :" +number2);
  21.  
  22. }
  23. }
Output:

  1. Before Swapping
  2. Value of number1 is :20
  3. Value of number2 is :30
  4. After Swapping
  5. Value of number1 is :30
  6. Value of number2 is :20


3. Java Program to Swap two integers by using bit wise operators


  1. package com.instaceofjava;
  2.  
  3. public class SwapTwoNumbers {
  4.  
  5. public static void main(String[] args) {
  6.  
  7. int number1=2;
  8. int number2=4;
  9.  
  10. System.out.println("Before Swapping");
  11. System.out.println("Value of number1 is :" + number1);
  12. System.out.println("Value of number2 is :" +number2); 
  13.  
  14. number1=number1^number2;
  15. number2=number1^number2;
  16. number1=number1^number2;
  17.  
  18. System.out.println("After Swapping");
  19. System.out.println("Value of number1 is :" + number1);
  20. System.out.println("Value of number2 is :" +number2);
  21.  
  22. }
  23. }
Output:

  1. Before Swapping
  2. Value of number1 is :2
  3. Value of number2 is :4
  4. After Swapping
  5. Value of number1 is :4
  6. Value of number2 is :2


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