Definition of a variable
A variable is a value that can change,
depending on conditions or on information passed to the program.
A computer program
is a list of instructions
that tell the computer
what to do. It also produces information on the data
that the program
uses when it is executing.
The data
consists of constants or fixed values that never change and variable
values (which are usually initialized to "0" or some other default
value because the actual values will be supplied by a program's
user). Usually, both constants and variables are defined as certain data
types. Each data type prescribes and limits the form of the data.
Examples of data
types include: an integer expressed as a decimal number, or a string of text
characters, usually limited in length.
In object-oriented
programming, each object
contains the data variables of the class
it is an instance of. The object's methods
are designed to handle the actual values that are supplied to the object when
the object is being used.
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PIE Software Inc. 09/07/2001
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