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:
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:
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.
