Swap two number in java using the third Variable

Interview Preparation

In this tutorial you will learn swapping of two numbers using third variable Java in  programming language.

This is also a most important program which commonly asked in interview.

Before directly moving on writing the program lets understand what is our aim to achieve in this program.

Basically Swapping of number means 

Suppose variable a has assigned value is 2 and the variable b has assigned value 4 then in swapping operation we will exchange the value and assign value of a i.e 2 in b and the value of b i.e. 4 in variable a.

How our program will behave?

As we already seen above that what we have to achieve in the program.

In the swapping program without using third variable we will assign two different value to the different variables.

 

For example: a=2 and b=4

 

Now after execution of the program our output should like 

a=4 and b = 2

Swapping of two numbers using third variable in Java language

import java.util.*;  
class Main{
    public static void main(String ...args){
        int tempvar;
        Scanner sc= new Scanner(System.in);
        System.out.print("Enter first number- ");  
        int firstno= sc.nextInt();  
        System.out.print("Enter second number- ");  
        int secondno= sc.nextInt();  
        System.out.print("before swapping number are : "+firstno+" and "+secondno);  
        tempvar=firstno;
	    firstno=secondno;
	    secondno=tempvar;
	    System.out.print("\nafter swapping number are : "+firstno+" and "+secondno);
    }
}

Output:

swap two number in java using third variable

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