How to swap two numbers without using temporary variable?

Description:

Write a program to swap or exchange two numbers. You should not use any temporary or third variable to swap.

Code:

? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 package com.govindsblog.algos;   public class MySwapingTwoNumbers {       public static void main(String a[]){         int x = 10;         int y = 20;         System.out.println("Before swap:");         System.out.println("x value: "+x);         System.out.println("y value: "+y);         x = x+y;         y=x-y;         x=x-y;         System.out.println("After swap:");         System.out.println("x value: "+x);         System.out.println("y value: "+y);     } }

Output:

Before swap: x value: 10 y value: 20 After swap: x value: 20 y value: 10

Write a program to print fibonacci series.

Description:

In mathematics, the Fibonacci numbers or Fibonacci series or Fibonacci sequence are the numbers in the following integer sequence: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144... By definition, the first two numbers in the Fibonacci sequence are 0 and 1, and each subsequent number is the sum of the previous two. Below example shows how to create fibonacci series.

Code:

? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 package com.govindsblog.algos;   public class MyFibonacci {       public static void main(String a[]){                    int febCount = 15;          int[] feb = new int[febCount];          feb[0] = 0;          feb[1] = 1;          for(int i=2; i < febCount; i++){              feb[i] = feb[i-1] + feb[i-2];          }            for(int i=0; i< febCount; i++){                  System.out.print(feb[i] + " ");          }     } }

Output:

0 1 1 2 3 5 8 13 21 34 55 89 144 233 377