# Articles

• ## Bitmap Graphics

Images are displayed on a computer monitor as bitmaps. A bitmap is a grid of pixels. The pixels may be represented using different numbers of bits which correspond to the number of colours present in the available range.

• ## Information Coding Systems

The problem of storing text in a digital form pre-dates the computer era. A variety of different digital coding schemes have been used from prehistoric times (ie: beacon fires) to relay predetermined messages. Other examples include Morse code and semaphore systems.

• ## Number Bases

The number base of a number is the number of unique digits possible in that number. eg:

• ## Number Types

#### Natural numbers

Numbers that are used by people every day for counting and ordering: $0,1,2,3,4,5,6,7,8,9$ This is called decimal or base-10. With a single digit, the largest value that can be represented is 9. To create large numbers we add a new digit to to the left to give the numbers 10…99 and so on.

• ## Number Systems

Binary examples $1101_2$ The 2 stands for the number base. In this case binary.

Alexander Craggs

An Avid Programmer.