Java : Problem - 03

Problem: -

1. Write a program to swap a number using third variables.
2. Write a program to swap a number without using third variables.

Solution: -

1. Write a program to swap a number using third variables.

import java.util.Scanner;

class swap {

public static void main(String[] args) {

Scanner scan = new Scanner(System.in);

System.out.print("Enter first number: ");

int num1 = scan.nextInt();

System.out.print("Enter second number: ");

int num2 = scan.nextInt();

System.out.println("\nBefore Swapping : \nFirst Number: " +num1+ "\nSecond Number: " +num2);

// swap number

int temp = num1;

num1 = num2;

num2 = temp;

System.out.println("\nAfter Swapping : \nFirst Number: " +num1+ "\nSecond Number: " +num2);

}

}

Output: -

2. Write a program to swap a number without using third variables.

import java.util.Scanner;

class swap1 {

public static void main(String[] args) {

Scanner scan = new Scanner(System.in);

System.out.print("Enter first number: ");

int num1 = scan.nextInt();

System.out.print("Enter second number: ");

int num2 = scan.nextInt();

System.out.println("\nBefore Swapping : \nFirst Number: " +num1+ "\nSecond Number: " +num2);

// swap number

num1 = num1 + num2;

num2 = num1 - num2;

num1 = num1 - num2;

System.out.println("\nAfter Swapping : \nFirst Number: " +num1+ "\nSecond Number: " +num2);

}

}

Output: -

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