Language Processors
The macro processor must perform

save the macro definitions
recognize macro definitions and macro calls
All of these
expand macro calls and substitute arguments

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Language Processors
An Interpreter is

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

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