Dynamic Array Size?

This is a discussion on Dynamic Array Size? within the C++ Programming forums, part of the General Programming Boards category; Is it possible to have a dynamic array size? For example: Code: ... int size; cout<<"size: "; cin>>size; cin.ignore(); int ...

  1. #1
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    Dynamic Array Size?

    Is it possible to have a dynamic array size?

    For example:
    Code:
    ...
    int size;
    cout<<"size: ";
    cin>>size;
    cin.ignore();
    int array[size];
    ...
    It wont compile but i was wondering if it's possible to achieve that some way.


    Thanks!
    "Anyone can aspire to greatness if they try hard enough."
    - Me

  2. #2
    Just Lurking Dave_Sinkula's Avatar
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    A std::vector?
    7. It is easier to write an incorrect program than understand a correct one.
    40. There are two ways to write error-free programs; only the third one works.*

  3. #3
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    Oh... ha.

    Never used a vector before.

    I'll have to look into that i suppose


    Thanks!
    "Anyone can aspire to greatness if they try hard enough."
    - Me

  4. #4
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    If you want to have the user input a value that will serve to initialize the array only once, you can dynamically allocate memory using the new operator. If you want to change the array's size you want an std::vector or an std::list.

    Code:
    int* array = new array[size]
    
    // ...
    
    // not to forget !
    delete[] array;
    array = 0;

  5. #5
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    Even if you don't need to change the array size, it is generally better to use a vector or other container in C++.

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