Swap Two Numbers in Java Using Function

by Online Tutorials Library July 22, 2022

Swap Two Numbers in Java Using Function

In this section, we will create Java programs to swap two numbers using functions with different logic.

STEP 1: START
STEP 2: DEFINE x, y, t
STEP 3: ENTER x, y
STEP 4: PRINT x, y
STEP 5: t = x
STEP 6: x= y
STEP 7: y= t
STEP 8: PRINT x, y
STEP 9: END

Java Program to Swap Two Numbers Using Function

Using User-defined Function

SwapNumbers.java

  import java.util.Scanner;  public class SwapNumbers  {  int a, b;  //function to swap two numbers   public void swapNum(SwapNumbers stn)  {  int temp;  //logic for swapping  temp = stn.a;  stn.a = stn.b;  stn.b = temp;  }  public static void main(String args[])   {  //creating object of the class  SwapNumbers sn = new SwapNumbers();  Scanner sc = new Scanner(System.in);               System.out.print(“Enter the first number: “);  sn.a = sc.nextInt();  System.out.print(“Enter the second number: “);  sn.b = sc.nextInt();  //function calling  sn.swapNum(sn);  //prints result after swapping  System.out.println(“After swapping: a= ” + sn.a + “, b= ” + sn.b);  }  }  

Output:

Enter the first number: 25  Enter the second number: 12  After swapping: a= 12, b= 25

Swap Two Numbers Without Using Third Variable

SwapNumber.java

  import java.util.Scanner;  public class SwapNumber  {  public static void main(String args[])  {  int x, y;  Scanner sc = new Scanner(System.in);  System.out.print(“Enter the first number: “);  x = sc.nextInt();  System.out.print(“Enter the second number: “);  y = sc.nextInt();  System.out.println(“Before Swappingnx = “+x+”ny = “+y);  swap(x, y);  }  public static void swap(int a, int b)  {  //swapping logic      a = a + b;  b = a – b;  a = a – b;  System.out.println(“After Swappingnx = “+a+”ny = “+b);  }  }  

Output:

Enter the first number: 78  Enter the second number: 45  Before Swapping  x = 78  y = 45  After Swapping  x = 45  y = 78

In the above program, we can replace the swapping logic with the following logic:

Swap Two Numbers Using Bitwise XOR (^) Operator

SwapNumberExample.java

  public class SwapNumberExample   {  public static void main (String args[])  {  int x = 12, y = 18;  System.out.println(“Before swapping values of x and y are: “+ x + “, ” + y);  //function calling  swapNumbers(x, y);  }  //function to swap two numbers using bitwise XOR (^) operator  static void swapNumbers(int x, int y)  {  //swapping logic      x = x ^ y ^ (y = x);  //prints the result  System.out.println(“After swapping values of x and y are: “+ x + “, ” + y);  }  }  

Output:

Before swapping values of x and y are: 12, 18  After swapping values of x and y are: 18, 12

Let’s see another logic to swap two numbers.

SwapNumbersExample.java

  public class SwapNumbersExample  {  public static void main (String args[])  {  int x = 12, y = 18;  System.out.println(“Before swapping, values of x and y are: “+ x + “, ” + y);  //function calling  swapNumbers(x, y);  }  //function to swap two numbers using bitwise operator  static void swapNumbers(int x, int y)  {  //swapping logic      x += (y – (y = x));  //prints the result  System.out.println(“After swapping: x = ” + x + “, y = ” + y);      }  }  

Output:

Before swapping, values of x and y are: 12, 18  After swapping: x = 18, y = 12

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