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

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

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

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

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Language Processors
A base register table

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

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Language Processors
Assembly code data base is associated with

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

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