BSCS Programming Languages and Compilers

Question 1

What is the first phase of a typical compiler?

Accepted Answer

Lexical analysis

Answer

Lexical analysis (scanning) is the first phase, converting the character stream into a sequence of tokens.

Question 2

What does a context-free grammar (CFG) describe?

Accepted Answer

The syntactic structure of a programming language

Answer

A CFG defines the valid syntactic structure of a language using production rules applied regardless of surrounding context.

Question 3

What is the difference between a compiled language and an interpreted language?

Accepted Answer

Compiled code is translated to machine code ahead of time; interpreted code is executed line by line at runtime

Answer

Compiled languages like C++ translate the entire program to machine code before execution, while interpreters like Python execute source code line by line.

Question 4

What is dynamic typing in a programming language?

Accepted Answer

Types are determined and checked at runtime

Answer

In dynamically typed languages like Python, variable types are resolved at runtime rather than at compile time.

Question 5

What is a closure in programming?

Accepted Answer

A function that captures variables from its enclosing scope

Answer

A closure is a function bundled with the variables from its surrounding lexical scope, allowing it to access those variables after the scope ends.

BSCS - Bachelor of Science in Computer Science Practice Test

BSCS - Bachelor of Science in Computer Science Practice Test

BSCS Programming Languages and Compilers