Online Coding Lessons C and C++ Coding 2

Question 1

In C, what does the sizeof operator return for an int on most modern 64-bit systems?

Accepted Answer

4 bytes

Answer

An int is typically 4 bytes on most modern platforms regardless of 32- or 64-bit.

Question 2

Which C++ keyword is used to prevent a member function from modifying the object's state?

Accepted Answer

const

Answer

Marking a member function const guarantees it will not modify the object's members.

Question 3

What is the result of the C expression 7 / 2 when both operands are integers?

Accepted Answer

3

Answer

Integer division in C truncates the fractional part, yielding 3.

Question 4

In C++, which container provides automatic dynamic resizing and contiguous storage?

Accepted Answer

std::vector

Answer

std::vector stores elements contiguously and grows automatically as needed.

Question 5

What does the C standard library function malloc return when allocation fails?

Accepted Answer

NULL

Answer

malloc returns NULL when it cannot allocate the requested memory.

Online Coding Lessons Practice Test