Thread: CHALLENGE: Classes =P

Was burning time at work so might as well code something. Below are 4 classes. Each class has functions that print either a positive output or a negative output.

This is mostly for the intermediate to advance level c++ coders since it requires a good knowledge of Inheritance and Abstract Classes.

GOAL
With just one line of code get a positive output which is in this case CORRECT OUTPUT.
YOU CANNOT CHANGE ANY CODE only add one line where indicated in the main.
A line of code ends with a ';'.

I only came up with 2 possible ways to get the desired output. Good luck
CODE

Code:

#include <iostream>
#include <string>

using namespace std;

class A
{
protected:
    string result;
public:
    A() {
        result = "CORRECT OUTPUT";
    }

    virtual void print() = 0;
    void print2()
    {
        print();
    }
};

class B : public A
{
private:
public:
    B(){} ~B()
    {
        result = "NO NO NO!!!";
    }
    virtual void print2()
    {
        cout << result << endl;
    }
};

class C : public B
{
private:
    string result;
public:
    C() : B() {
        result = "CORRECT OUTPUT";
    }

    virtual void print() = 0;
    void print2()
    {
        print();
    }
};

class ABC : public A, public C
{
private:
    string result;
public:
    ABC() : A(), C() {
        result = "DON'T OUTPUT ME!!!";
    }

    void print()
    {
        cout << result << endl;
    }

};


int main(int argc, char **arg)
{
    ABC * abc = new ABC();
    //one line of code here 
    return 0;
}

Originally Posted by adeyblue

delete ((std::cout << "CORRECT OUTPUT"), abc);

i'm sorry but that doesn't count. why?

Code:

delete ((std::cout << "I CAN OUTPUT ANYTHING I WANT"), abc);

just by changing the string it doesn't work anymore. it's just another way of writing to the screen. you use the functions in the classes above to get your output.

Don't give up

Code:

 abc->B::print2();

Code:

std::cout << "CORRECT OUTPUT\n";

Edit: couldn't help it.

Originally Posted by phantomotap

So, yea, this is not an intermediate level thing and certainly not an advance level thing. This is a piece of garbage that only serves to illustrate all the mistakes a newbie can make.

Soma

umm dude... no one codes like this OBVIOUSLY that's why is a FREAKING CHALLENGE to get your ass thinking. i deliberately made it that way so if you don't know what you're doing then you're screwed *sigh i hate trolls

Originally Posted by nimitzhunter

Code:

 abc->B::print2();

congratz u saw through all the mumbo jumbo i placed in there =D.

Originally Posted by phantomotap

O_o

Agreed. It wouldn't produce the correct output if you also changed the string in the class constructors. Of course, if you are going around changing code, you may as well correct all of the code.

Soma

i meant the string in here:

Code:

delete ((std::cout << "CORRECT OUTPUT"), abc);

if u have nothing proper to say then don't post please.

Originally Posted by bobknows

what prevents you from just saying

Code:

cout << "CORRECT OUTPUT";

?

-__-

it defeats the purpose of the whole thread. note the heading says classes. use a class to output the right string.

i didn't think i had to specify that

@phantomotap

i coded, inherited and abstracted what i did for a reason. 2 ways because (*abc). and abc-> are the same thing.

Code:

(*abc).C::B::print2();

Code:

(*abc).B::print2();

Code:

abc->B::print2();

Code:

abc->C::B::print2();

if you are so pro then make one.