Showing posts with label or. Show all posts
Showing posts with label or. Show all posts
Wednesday, February 18, 2015
How to Swap Two Numbers Without Using Temporary Variable or Arithmetic Operators
You have done swapping of two numbers using temporary variable or by using arithmetic operators. It can be done in following way.
Lets take two numbers a=5 and b=7.
Using Temporary Variable
temp=a; //temp becomes 5
a=b; //a becomes 7
b=temp; //b becomes 5
Also Read: C++ program to swap two numbers using pointers
Also Read: C++ program to swap two numbers using class
Using Arithmetic Operators
a=a+b; //a becomes 12
b=a-b; //b becomes 5
a=a-b; //a becomes 7
or
a=a*b; //a becomes 35
b=a/b; //b becomes 5
a=a/b; //a becomes 7
In this article I am sharing another method, may be you are already familiar with it. Swapping of two numbers can also be done by using bitwise XOR operator i.e. ^. The XOR of two numbers a and b returns a number which has all the bits as 1 wherever bits of a and b differ. If bits are same then resultant bit will be 0.
For example binary of 5 is 0101 and 7 is 0111. If you do XOR of 5 and 7 then result will be 0010. A c program is given below that uses this concept to swap values of two numbers.
Also Read: C++ program to swap two numbers using macros
Also Read: C++ Templates: Program to Swap Two Numbers Using Function Template
#include <stdio.h>
int main()
{
int a=5,b=7;
a=a^b; // a becomes 2 (0010)
b=a^b; // b becomes 5 (0101)
a=a^b; // a becomes 7 (0111)
printf("After Swapping: a=%d,b=%d",a,b);
return 0;
}
If you have any doubts or know any other method to swap values of two numbers then mention it in comment section.
Happy Coding!! :) :)
Source: http://www.geeksforgeeks.org/swap-two-numbers-without-using-temporary-variable/
Tuesday, February 3, 2015
AS3 Detecting if the Mouse is Idle or Not Moving
In ActionScript 3, you can use MouseEvent.MOUSE_MOVE in order to detect when the user moves the mouse in your Flash movie, but I needed something that could detect the opposite. I needed to check whether the mouse was idle or not moving. I needed to find a way to check if the mouse pointer is being still and is just staying put in the same spot. So I noodled around a bit with some code, and what I came up with was an ENTER_FRAME event listener that would constantly check for the current x and y positions of the mouse pointer to see if the values were changing. To be able to check if the values were changing, I created 2 variables for each of the coordinates - 2 variables for the x coordinates, and 2 variables for the y coordinates. I made 2 sets so that I could compare them to see if the position of the mouse pointer has changed. I had posXa & posXb for the x coordinates, and posYa & posYb for the y coordinates. And then I used stage.mouseX and stage.mouseY to alternately assign the current position of the mouse pointer to the 2 sets of variables every time the ENTER_FRAME event gets triggered. The first time the ENTER_FRAME event listener runs, the location of the mouse pointer is assigned to posXa and posYa. Then the next time it runs, the location is assigned to posXb and posYb instead. And then it just continues to alternate each time the ENTER_FRAME event gets dispatched. I have a switcher variable, which is just an integer that switches back and forth between 0 and 1, and I am using that to tell Flash to alternately assign the values to either set. The idea here is to constantly check whether the values in set A and set B are the same or not. If they are, it means that the mouse is in the same spot, and is therefore not moving. Heres the code:
Read more »
var switcher:int = 0;
var posXa:Number = stage.mouseX;
var posYa:Number = stage.mouseY;
var posXb:Number = stage.mouseX;
var posYb:Number = stage.mouseY;
this.addEventListener(Event.ENTER_FRAME, checkMovement);
function checkMovement(e:Event):void
{
if (switcher == 0)
{
posXa = stage.mouseX;
posYa = stage.mouseY;
switcher = 1;
}
else
{
posXb = stage.mouseX;
posYb = stage.mouseY;
switcher = 0;
}
if (posXa == posXb && posYa == posYb)
{
trace("not moving");
}
else
{
trace("moving");
}
}
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