CPP Syntax Fundamentals & Data Structures

Question 1

Which symbol is used to terminate a statement in C++?

Accepted Answer

;

Answer

In C++, the semicolon (;) acts as a statement terminator, signaling the end of a complete instruction or declaration to the compiler. Without it, the compiler would not know where one statement ends and the next begins, leading to syntax errors. This is a fundamental rule for structuring C++ code.

Question 2

What is the correct way to declare an integer variable in C++?

Accepted Answer

int x;

Answer

In C++, variables must be declared with their data type followed by the variable name. 'int' is the keyword used to specify an integer data type, and 'x' is the chosen variable name. This syntax `int x;` correctly informs the compiler to reserve memory for an integer variable named 'x'.

Question 3

What does the 'new' keyword do in C++?

Accepted Answer

Allocates memory dynamically

Answer

The `new` keyword in C++ is used for dynamic memory allocation. It requests memory from the heap at runtime, rather than from the stack at compile time, and returns a pointer to the newly allocated memory. This allows programs to manage memory more flexibly, especially for objects whose size or number isn't known until execution.

Question 4

Which data structure uses FIFO (First In, First Out)?

Accepted Answer

Queue

Answer

A queue is a linear data structure that follows the First In, First Out (FIFO) principle. This means the first element added to the queue is the first one to be removed, similar to how people wait in a line. Elements are added to the rear (enqueue) and removed from the front (dequeue).

Question 5

Which keyword is used to create a constant in C++?

Accepted Answer

const

Answer

The `const` keyword in C++ is used to declare a constant, meaning its value cannot be changed after initialization. This helps enforce data integrity and makes code more robust by preventing accidental modifications to important values. It can be applied to variables, function parameters, and member functions.

(CPP) C++ Programming Professional Certificate Practice Test

(CPP) C++ Programming Professional Certificate Practice Test

CPP Syntax Fundamentals & Data Structures