Java Program To Swap Two Numbers

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Write a program in Java to Swap two digits using a third variable.

import java.util.Scanner;

class Swapping

{

public static void main(String args[])

{

int first_no, sec_no, third_no;

System.out.println(“Enter first_no and sec_no”);

Scanner in = new Scanner(System.in);

first_no = in.nextInt();

sec_no = in.nextInt();

System.out.println(“Before Swapping\nfirst_no = “+first_no+”\nsec_no = “+sec_no);

third_no = first_no;

first_no = sec_no;

sec_no = third_no;

System.out.println(“After Swapping\nfirst_no = “+first_no+”\nsec_no = “+sec_no);

}

}

The above program shows sec_no how to swap two digits using a third variable. In this program, we have three variables first_no,sec_no, and third_no. We accept values of first_no and sec_no from the user. We use the third_no variable as a third variable which is used to store the first_no variable value. Then swapping is sec_no as shown in the above program.

Output:

Swap two nos. with using a third variable

Write a program in Java to Swap two digits Without using a third variable.

import java.util.Scanner;

class Swapping1

{

public static void main(String args[])

{

int first_no, sec_no;

System.out.println(“Enter first_no and sec_no”);

Scanner in = new Scanner(System.in);

first_no = in.nextInt();

sec_no = in.nextInt();

System.out.println(“Before Swapping\nfirst_no = “+first_no+”\nsec_no = “+sec_no);

first_no=first_no+sec_no;

sec_no=first_no-sec_no;

first_no=first_no-sec_no;

System.out.println(“After Swapping\nfirst_no = “+first_no+”\nsec_no = “+sec_no);

}

}

Swap two nos. without using a third variable

The above program shows sec_no how to swap two digits without using a third variable. In this program, we have two variables first_no and sec_no. we accept values of first_no and sec_no from the user.