A computer program is a set of instruction or statement
(also called code) to be carried out by the computer CPU.Programs, or software
come in forms. These can be broken down into there major categories: operating
system utilize, and application (see Figure 12A.1).
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A program is typically composed of a main module and sub
modules. These modules are stored as a collection of files; large programs can
contain thousands of individual’s files, each serving a specific purpose. Some
of the files contain instruction for the computers , while other files contain data
.For windows –based PCs some common extension for program files include the
following.
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