Language Processors
Job Control Language (JCL) statements are Used to

Specify, to the operating system, the beginning and end of a job in a batch
Read the input from the slow-speed card reader to the high-speed magnetic disk
Allocate the CPU to a job
All of these

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Language Processors
In analyzing the compilation of PL/I program, the term "Machine independent optimization" is associated with

creation of more optional matrix
use of macro processor to produce more optimal assembly code
recognition of basic elements and creation of uniform symbols
recognition of basic syntactic constructs through reductions

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Language Processors
A compiler is

a program that places programs into memory and prepares them for execution
is a program that appears to execute a source program as if it were machine language
program that accepts a program written in a high level language and produces an object program
a program that automate the translation of assembly language into machine language

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Language Processors
A base register table

is a term that refers to the control programs of an operating system
is used to remember which of the general-purpose registers are currently available as base registers, and what base addresses they contain
allows multiple programs to reside in separate areas of core at the same time
allows the programmer to write base registers and displacements explicitly in the source program

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