Swap two numbers in java using third or temporary variable (example)

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  • Given two input numbers, swap numbers using temporary variable.
    • e.g. Given two input numbers x = 10 & y = 30
    • exchange two variables using temporary variables
    • After swapping we should get out x = 30 & y = 10.
  • We have shown swapping of two variables in Fig 1.
swap variables java
Fig 1: Swap two variables

1. Program: swap two variable using temporary (third) variable in java

package org.learn;
 
import java.util.Scanner;
 
public class DemoSwapNumbers {
 
    public static void main(String[] args) {
        try (Scanner scanner = new Scanner(System.in)) {
             
            System.out.printf("1. Enter first number : ");
            int x = scanner.nextInt();
             
            System.out.printf("2. Enter second number : ");
            int y = scanner.nextInt();
             
            System.out.printf("3. Numbers before swapping: x = %d, y = %d \n", x, y);
 
            int temp = x;
            x = y;
            y = temp;
 
            System.out.printf("4. Numbers after swapping: x = %d, y = %d \n", x, y);
 
        }
    }
 
}

2. Output: swap two variables using third variable in java

1. Enter first number : 50
2. Enter second number : 100
3. Numbers before swapping: x = 50, y = 100
4. Numbers after swapping: x = 100, y = 50
 
1. Enter first number : 27
2. Enter second number : 55
3. Numbers before swapping: x = 27, y = 55
4. Numbers after swapping: x = 55, y = 27

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