Data and Program Representation

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Presentation transcript:

Data and Program Representation In order to be understood by a computer, data and programs need to be represented appropriately Coding systems: Digital computers: Digital data representation:

Digital Data Representation Bit: Byte = Byte terminology used to express the size of documents and other files, programs, etc. Prefixes are often used to express larger quantities of bytes: _______ (KB), ________ (MB), ______ (GB), _________ (TB), etc.

The Binary Numbering System Numbering system: A way of representing numbers Decimal numbering system Binary numbering system . In both systems, the position of the digits determines the power to which the base number (such as 10 or 2) is raised

The Binary Numbering System

Coding Systems for Text-Based Data ASCII and EBCDIC ASCII: EBCDIC:

Coding Systems for Text-Based Data Unicode: newer code Replacing ______ as the primary text-coding system

Coding Systems for Other Types of Data Graphics (still images such as photos or drawings) Bitmapped images: A variety of bit depths are possible (4, 8, 24 bits) .

Coding Systems for Other Types of Data Audio data: Often compressed when sent over the Internet . Video data: Amount of data can be substantial, but can be compressed

Representing Programs: Machine Language Early programs were written in machine language. Today’s programs still need to be translated into machine language in order to be understood by the computer Most programs are written in other programming languages Language translators are used to translate the programs into machine language

1. Another way to say “one million bytes” is Quick Quiz 1. Another way to say “one million bytes” is a. one kilobyte one gigabyte one megabyte 2. True or False: MP3 files are stored using 0s and 1s. 3. The _____________ numbering system is used by computers to perform mathematical computations.