Swap two numbers without using third variable is java program to swapping program in java without using third variable
In this tutorial, we are going to learn new program which is a simple program and most commonly used in exams or in interviews that is Swap two numbers without using third variable.
What is swapping: Swapping two number means replacing the numbers.
How to swap two numbers without a third variable
Swapping of two numbers in java
For swapping number first we have 2 numbers and without using third variable we swap numbers by doing a simple mathematical operation (sum and subtract )
1. Add first and second number and store addition in the first variable.
a = a + b
2. Subtract first and second number and store it in the second variable.
b = a – b
3. Subtract first and second number and store it in the first variable.
a = a – b
Swapping program in java( without using third variable)
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import java.util.*; public class Main { public static void main(String[] args) { int x,y, i=1; Scanner sc = new Scanner(System.in); System.out.print("Enter two Number : "); x = sc.nextInt(); y = sc.nextInt(); System.out.println("Before swaping:" + " x = " + x + ", y = " + y); x = x + y; y = x - y; x = x - y; System.out.println("After swaping:" + " x = " + x + ", y = " + y); } } |
Output :
Explanation:
1. First we declare variable.
x => for storing 1st number
y =>for storing the second number
2. Take input from user
x = sc.nextInt(); => x= 10
y = sc.nextInt(); => y= 20
2. Now here goes the logic(let us take x= 10 and y=20)
x = x+ y, Therefore, x=10+20 =30
y= x- y, Therefore y= 30 – 20 =10
x= x- y, Therefore x=30 – 10 = 20
3. Now the values of x and y are 20 and 10
4. The values of x and y are printed.
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