How can C++ code call a C function?

What does this part of a main.cpp file do? #include "library.h"

What's wrong with this definition when using a pre-C++11 compiler?

What is the statement below equivalent to? sprite->x

What would be the output of this code? int32_t nums[3]={2,4,3}; std::cout << ( nums[0] << nums[1] << nums[2] );

Which of the following STL classes is the best fit for implementing a phonebook? Suppose each entry contains a name and a phone number, with no duplicates, and you want to have lookup by name.

std::vector<int> foo(5);

Within a class declaration, the statement 'virtual int foo() = 0;' does what?

Output of the given code? #include struct shape { virtual void move() { std::cout << 'shape::move\n'; } }; struct circle : public shape { void move() { std::cout << 'circle::move\n'; } }; struct rectangle : public shape { void move() { std::cout << 'rectangle::move\n'; } }; int main() { shape *s; s = new shape(); s->move(); s = new circle(); s->move(); s = new rectangle(); s->move(); return 0; }

What does the line: #include <iostream> mean in a C++ program?

Which of the following is a valid variable identifier in C++?