Compilers

Syntax-Directed Definitions and Translations

Question 1
Marks : +2 | -2
Pass Ratio : 100%
The table created by lexical analysis to describe all literals used in the source program is?
Terminal table
Literal table
Identifier table
Reductions
Explanation:
In computer science, and specifically in compiler and assembler design, literal pool is a lookup table used to hold literals during assembly and execution.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
The process manager has to keep track of ___________
Status of each program
Information to a programmer using the system
Status of each program & Information to a programmer using the system
None of the mentioned
Explanation:
Process manager keep track of the status and info about the program.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
The root directory of a disk should be placed ___________
At a fixed address in main memory
At a fixed location on the disk
Anywhere on the disk
None of the mentioned
Explanation:
Root directory is placed at a fixed disk location
Question 4
Marks : +2 | -2
Pass Ratio : 100%
What is the function of the syntax phase?
recognize the language and to cal the appropriate action routines that will generate the intermediate form or matrix for these constructs
Build a literal table and an identifier table
Build a uniform symbol table
Parse the source program into the basic elements or tokens of the language
Explanation:
In this phase symbol table is created by the compiler which contains the list of lexemes or tokens.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
Software that measures, monitors, and controls events are ___________
System S/w
Real Time software
Scientific software
Business Software
Explanation:
In computer science, real-time computing (RTC), or reactive computing describes hardware and software systems subject to a “real-time constraint”, for example operational deadlines from event to system response.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
Which of the following functions is performed by loader?
Allocate memory for the programs and resolve symbolic references between objects decks
Address dependent locations, such as address constants, to correspond to the allocated space
Physically place the machine instructions and data into memory
All of the mentioned
Explanation:
A loader is the part of an operating system that is responsible for loading programs and libraries.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
In a single pass assembler, most of the forward references can be avoided by putting the restriction ___________
On the number of strings/life reacts
Code segment to be defined after data segment
On unconditional rump
None of the mentioned
Explanation:
A single pass assembler scans the program only once and creates the equivalent binary program.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
Which table is a permanent database that has an entry for each terminal symbol?
Terminal Table
Literal Table
Identifier Table
None of the mentioned
Explanation:
A database that has entry for each terminal symbols such as arithmetic operators, keywords, punctuation characters such as ‘;’, ‘,’etc Fields: Name of the symbol.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
If E be a shifting operation applied to a function f, such that E(f) = f (x +β ), then?
E (αf+β g) = α E(f) +β E (g)
E (αf +β g ) =. ( α+ β ) + E (f + g)
E (αf +β g ) = α E (f+gβ)
E (αf +β g ) = αβ E (f + g)
Explanation:
Shifting operation when performed gives this result.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
Assembly code data base is associated with ___________
Code is converted into assembly
Table of rules in the form of patterns for matching with the uniform symbol table to discover syntactic structure
All of the mentioned
None of the mentioned
Explanation:
An assembly language is a low-level programming language for a computer, or other programmable device, in which there is a very strong (generally one-to-one) correspondence between the language and the architecture’s machine code instructions.