What is the output of the following main()? Suppose the code segments will be as

Question

What is the output of the following main()? Suppose the code segments will be assembled and embedded correctly in a C++ program.

CODE:

class small

{

public:

void print() const { std::cout << "small: x " << x << ", y " << y << " "; }

int add() { return x + y; }

small(int a = 0, int b = 0) : x(a), y(b) {}

private:

int x;

int y;

};

class notSmall : public small

{

public:

void print() const { small::print(); std::cout << "notSmall: z " << z << " "; }

int add() { return small::add() + z; }

notSmall(int a = 0, int b = 0, int c = 0) : small(a, b), z(c) {}

private:

int z;

};

int main()

{

small * ptrSmall;

small objSmall(2, 3);

notSmall objBig(3, 5, 7);

ptrSmall = &objSmall;

std::cout << ptrSmall->add() << " ";

ptrSmall->print();

ptrSmall = &objBig;

std::cout << ptrSmall->add() << " ";

ptrSmall->print();

return 0;

} // end main

What would be the output of the main()in a, if the print() and add() of class small are virtual functions?

Explanation / Answer

Part I:

output:

5
small: x 2, y 3
8
small: x 3, y 5

Part II: if the print() and add() of class small are virtual functions

Output:

5
small: x 2, y 3
15
small: x 3, y 5
notSmall: z 7

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