function

This is a discussion on function within the C++ Programming forums, part of the General Programming Boards category; Is it possible to have a function that that takes and returns multiple variables other than arrays?...

  1. #1
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    function

    Is it possible to have a function that that takes and returns multiple variables other than arrays?

  2. #2
    The larch
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    Yes, you can pass arguments as references.

    Or return a struct / class.

    Then there are also standard containers which probably wouldn't count as an array.
    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).

  3. #3
    Registered User MacNilly's Avatar
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    A C or C++ function can only "return" one value, declared as the return value in the function prototype. In reality, you can pass arguments as pointers (or by "reference" if you prefer C++ nomenclature) to local variables which will take on a value after the function returns.

    Ie:

    Code:
    void area(int length, int width, int *area)
    {
      *area = length * width;
    }
    I'm a little shaky on C++ code but you could do the same using references...

    Code:
    void area(int L, int W, int &Area)
    {
      Area = L * W;
    }
    I'd think either would work...

    SOrry for the C++ code. In C++, the & operator can have a different meaning depending on context.

    Just check out the first example...
    Last edited by MacNilly; 07-23-2007 at 03:36 AM.

  4. #4
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    Quote Originally Posted by MacNilly View Post
    A C or C++ function can only "return" one value, declared as the return value in the function prototype. In reality, you can pass arguments as pointers (or by "reference" if you prefer C++ nomenclature) to local variables which will take on a value after the function returns.

    Ie:

    Code:
    void area(int length, int width, int *area)
    {
      *area = length * width;
    }
    I'm a little shaky on C++ code but you could do the same using references...

    Code:
    void area(int L, int W, int &Area)
    {
      Area = L * W;
    }
    I'd think either would work...

    SOrry for the C++ code. In C++, the & operator can have a different meaning depending on context.

    Just check out the first example...
    Better still, forget the first method, and go with the second. Its better to avoid pointers in C++ and use references where possible.

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