Online Coding Lessons C and C++ Coding 4

Question 1

In C, what is the value of an array name when used in most expressions?

Accepted Answer

A pointer to the first element

Answer

The first element's value

Answer

The array size

Answer

A copy of the array

Question 2

Which C++ access specifier makes members accessible only within the class itself?

Accepted Answer

private

Answer

public

Answer

protected

Answer

friend

Question 3

What does the C function strlen return for the string "hello"?

Accepted Answer

5

Answer

6

Answer

4

Answer

0

Question 4

In C++, what does the 'virtual' keyword enable for a base class function?

Accepted Answer

Runtime polymorphism via dynamic dispatch

Answer

Inline expansion

Answer

Compile-time binding

Answer

Constant evaluation

Question 5

What is the correct format specifier to print a floating-point double with printf in C?

Accepted Answer

%f

Answer

%d

Answer

%s

Answer

%c

Question 6

In C++, which header provides std::cout and std::cin?

Accepted Answer

Answer

<stdio.h>

Answer

Answer

Question 7

What happens if you call free() twice on the same C pointer?

Accepted Answer

Undefined behavior

Answer

Nothing harmful

Answer

The memory is doubled

Answer

It returns NULL