C++

Question 0

C++ Show code for a mutex

Answer 0

static std::mutex mutex;
std::lock_guard lock(mutex)
// mutex automatically is unlocked when leaving function! Mutex
// destructor does the unlocking!

Question 1

Create a sample program to demonstrate semaphores.

Answer 1

#define SEMAPHORE_COUNT 10
sem_type semaphore;

sem_init (semaphore,0,SEMAPHORE_COUNT);

sem_wait(&semaphore); 
// do stuff
sem_post(&semaphore); // free it

Question 2

What is RAII?

Answer 2

Resource Acquisition is Initialization

Allocate a resource when it is needed, allocate when not. Acquire resources in the constructor, destroy in destructor.

Question 3

What are the standard sequence containers in the c++ STL?

Answer 3

Vector, deque and list

Question 4

What are the standard associative containers in c++ STL?

Answer 4

Set, multiset, map, multimap

Question 5

C++: What does stringstream do, and what do you include?

Answer 5

include

A stringstream is a string that can be treated as a stream.

Question 6

C: what preprocessor directives can you use to print out the function, file and line you are in?

Answer 6

__FUNCTION__
__LINE__
__FILE__

Question 7

C++

Explain:
class Complex : Number

Answer 7

Complex inherits Number.

HOWEVER! It inherits is such that all of number is private. What is probably meant is:
class Complex : public Number