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
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

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

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

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Language Processors
Terminal Table

a permanent table of decision rules in the form of patterns for matching with the uniform symbol table to discover syntactic structure
contains all constants in the program
consists of a full or partial list of the tokens as they appear in the program. Created by Lexical analysis and used for syntax analysis and interpretation
a permanent table which lists all key words and special symbols of the language in symbolic form

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Language Processors
Indicate which of the following is not true about 4GL?

4GL does not support a high-level of screen interaction
All of these
Many database management system packages support 4GLs
A 4GL is a software tool which is written, possibly, in some third generation language

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Language Processors
The advantage(s) of incorporating the macro processor into pass 1 is/ are:

Functions are combined and it is not necessary to create intermediate files as output from the macro processor and input to the assembler
All of these
more flexibility is available to the programmer in which he/she may use all the features of the assembler in conjunction with macros
many functions do not have to be implemented twice

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