Compilers

Syntax-Directed Definitions and Translations

Question 1
Marks : +2 | -2
Pass Ratio : 100%
In what module multiple instances of execution will yield the same result even if one instance has not terminated before the next one has begun?
Non usable module
Serially usable
Re-enter-able
None of the mentioned
Explanation:
Re enter-able module is the reason why the compiler is used in the first place.
Question 2
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 3
Marks : +2 | -2
Pass Ratio : 100%
Which of the following is true for machine language?
Continuous execution of program segments
Depicting flow of data in a system
A sequence of instructions which solves a problem
The language which interacts with the computer using only the binary digits 1 and 0
Explanation:
Machine code or machine language is a set of instructions executed directly by a computer’s central processing unit (CPU). Each instruction performs a very specific task.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
Pass I ______________
Assign address to all statements
Save the values assigned to all labels for use in pass 2
Perform some processing
All of the mentioned
Explanation:
The pass 1 of a compiler the above mentioned functions are performed
Question 5
Marks : +2 | -2
Pass Ratio : 100%
The method which merges the bodies of two loops is?
Loop rolling
Loop jamming
Constant folding
None of the mentioned
Explanation:
In computer science, loop fusion (or loop jamming) is a compiler optimization and loop transformation which replaces multiple loops with a single one.
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%
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 8
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 9
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 10
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.