Language Processors
In analyzing the compilation of PL/I program, the term "Lexical analysis" is associated with

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

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Language Processors
An Interpreter is

a program that places programs into memory and prepares them for execution
a program that automate the translation of assembly language into machine language
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

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Language Processors
Assembler is

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

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Language Processors
The system/370 assembler language

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
is a term that refers to the control programs of an operating system
allows the programmer to write base registers and displacements explicitly in the source program

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