Page 17 - DCAP507_SYSTEM_SOFTWARE

Unit 1: Introduction to System Software

12. .................................... is a program whose job is to accept as input a source program written Notes
in a some high-level language and to generate as output an object code which can be
executed on the computer.
13. .................................... is a translator program that converts a statement of high-level language
to machine language and implements it instantly.

14. .................................... is a custom that loads an object program and organizes it for execution.
15. The .................................... substitutes every macro instruction with the equivalent group of
source language statements.

1.4 Summary

 System software is defined as software needed to assist the production or implementation
of application programs but which is not particular to any specific application.

 An instruction is a set of programs that has to be fed to the computer for procedure of
computer system all together.
 SIC points to Simplified Instruction Computer which is a imaginary computer that has
been intended to comprise the hardware traits most frequently found on real machines,
while averting unusual and immaterial complexities.

 Operating System is the most significant system program that performs as an interface
among the users and the system. It makes the computer simpler to utilize.
 Language translator is the program that takes an input program in one language and
generates an output in another language.
 Compiler is a program whose job is to accept as input a source program written in a some
high-level language and to generate as output an object code which can be executed on the
computer.
 Interpreter is a translator program that converts a statement of high-level language to
machine language and implements it instantly.
 An Assembler is a program which is used to translate an assembly language program into
its machine level language equivalent.
 Loader is a custom that loads an object program and organizes it for execution and linking
is the process of binding an exterior reference to the accurate link time address.

 A macro displays a generally used group of statements in the source programming
language.

1.5 Keywords

Assembler: An Assembler is a program which is used to translate an assembly language program
into its machine level language equivalent.
Compiler: Compiler is a program whose job is to accept as input a source program written in a
some high-level language and to generate as output an object code which can be executed on the
computer.
Instruction: An instruction is a set of programs that has to be fed to the computer for procedure
of computer system all together.

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