In this post, we will see how to swap two numbers without using temporary variables.
There are three ways to do it.
Java program:
Java program:
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package org.arpit.java2blog; class SwapingTwoNumbers { public static void main(String args[]){ int a = 5; int b = 10; // First way System.out.println("First way"); System.out.println("Before swap:"); System.out.println("a value: "+a); System.out.println("b value: "+b); a = a+b; b = a-b; a = a-b; System.out.println("After swap:"); System.out.println("a value: "+a); System.out.println("b value: "+b); // Second way System.out.println("****************"); System.out.println("Second way"); System.out.println("Before swap:"); System.out.println("a value: "+a); System.out.println("b value: "+b); a = a*b; b = a/b; a = a/b; System.out.println("After swap:"); System.out.println("a value: "+a); System.out.println("b value: "+b); //Third way System.out.println("****************"); System.out.println("Third way"); System.out.println("Before swap:"); System.out.println("a value: "+a); System.out.println("b value: "+b); a = a^b; b = a^b; a = a^b; System.out.println("After swap:"); System.out.println("a value: "+a); System.out.println("b value: "+b); } } |
When you run above program, you will get following output:
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First way Before swap: a value: 5 b value: 10 After swap: a value: 10 b value: 5 **************** Second way Before swap: a value: 10 b value: 5 After swap: a value: 5 b value: 10 **************** Third way Before swap: a value: 5 b value: 10 After swap: a value: 10 b value: 5 |
Third way is fastest of all.
Please go through Interview programs in java for more such programs.
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