A trigraph in C is formed of three characters, the first two characters are interrogation marks ??, and the last character is just a regular character.
ISO 646, standardized ASCII, and made national variants of it. The … Read More
The DisplayMetrics class in android a tutorial
What is the DisplayMetrics class ?
The DisplayMetrics class is used to get various information about the screen in android .The information that we can get are the following :
DENSITY_DEVICE_STABLE :The density of the device in ppi read
Screen measurement in android
Screen measurement
What is Screen size ?
A smartphone , has a width and a height which can be expressed in inches . The screen size is the length of the diagonal of the smartphone , and which can be … Read More
The Ones’ complement operator ~ in python a tutorial
The ones’ complement operator ~ , will flip the bits of an integer , so one will become zero , and zero will become one. An integer in python , has :
- an unlimited number of bits .
- is
Shift operators in java , a tutorial
A shift operator will shift the bits by a number of positions . In java we have three shift operators , they are
- The right shift signed operator
, which shift the bits to the right , while keeping the
Regex in java , part two , The Matcher class
Regex in java , part one , The Pattern class
What is a regex ?
Regex stands for regular expression . it is a string which is formed of characters used to perform :
- searching
- replacing
- validation
in other string. In addition to the regular characters that a regex can … Read More
How to generate random numbers in swift ?
How to generate random number ins swift
We can generate random numbers in swift by one of these three methods :
- using the
arc4randomlibrary - using the default system random number generator
SystemRandomNumberGenerator - by using GamePlayKit classes that implement the
Bitmap in android a tutorial ?
What is bitmap ?
A bitmap is an object , which is an instance of the Bitmap Class. This class represents a 2d coordinate system . The coordinate system move to the right on the x axis , and to … Read More
Color in android a tutorial
what is Light ?
A light is a wave which doesn’t need a medium to propagate . Other examples of waves are water waves , or air waves which need water and air as a medium to propagate .Water , … Read More