Question of test c++

This is a discussion on Question of test c++ within the C++ Programming forums, part of the General Programming Boards category; is somebody now, which answer is ok. ? thank yuo for help Which of the following special methods can be ...

  1. #1
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    Question of test c++

    is somebody now, which answer is ok. ?

    thank yuo for help

    Which of the following special methods can be created implicitly by C++ compiler inside a class (letís say A)?


    a. the operator: const A& operator()(const A&);


    b. the operator: void operator~(const A*);

    c. the assignment operator: A& operator=(const A&);

    d. the constructor: A(const A*);

  2. #2
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    i wish i could tell that they are a and c
    but that would be wrongo
    tell us your guess?

  3. #3
    Cat without Hat CornedBee's Avatar
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    Sorry, you can't offload your exams on us.
    All the buzzt!
    CornedBee

    "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
    - Flon's Law

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    CornedBee, do you valid answer??
    It's not may exam. I want to know it.
    I have problem with this question.

    best regarts,
    endrzer

  5. #5
    C++まいる!Cをこわせ! Elysia's Avatar
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    You could explain what you think and why. We can help to correct your understanding if it's incorrect.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

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    i think it's
    c) the assignment operator: A& operator=(const A&);
    but i'm not sure..

  7. #7
    C++まいる!Cをこわせ! Elysia's Avatar
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    Yes, that is correct.
    Code:
    class A { };
    
    void Help()
    {
    	A a, b, c;
    	a = b = c;
    }
    This code obviously works but wouldn't if the compiler didn't automatically generate that operator by default.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

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    Thank you very much Elysia
    best regarts,
    endrzer

  9. #9
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    Next time you might try writing a small test program. Write a class that doesn't overload any of these operators and see which ones the compiler lets you call.
    I might be wrong.

    Thank you, anon. You sure know how to recognize different types of trees from quite a long way away.
    Quoted more than 1000 times (I hope).

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