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Quick Question New Operator

This is a discussion on Quick Question New Operator within the C++ Programming forums, part of the General Programming Boards category; Hi guys, Been away from programming for a while. I've read some info on the new operator and get the ...

  1. #1
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    Cool Quick Question New Operator

    Hi guys,

    Been away from programming for a while.

    I've read some info on the new operator and get the general jist.

    Can someone tell me in laymans terms/baby language, what I get and what I can basically done and can do with a statement like:

    Code:
    x = new double[2000]
    Cheers!!

  2. #2
    template<typename T> threahdead's Avatar
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    After this assignment, you can index x from 0 to 1999.
    Another way to put it is to say now you have 2000 doubles allocated in memory which must be deleted afterwards again with

    Code:
    delete [] x;
    strokebow likes this.

  3. #3
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    Great. Simply put.

    Thanks.

    So how do I use x now? Just like an array??

    e.g.)
    Code:
    x[0] = 1; x[1] = 2;

  4. #4
    template<typename T> threahdead's Avatar
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    Quote Originally Posted by strokebow View Post
    Great. Simply put.

    Thanks.

    So how do I use x now? Just like an array??

    e.g.)
    Code:
    x[0] = 1; x[1] = 2;
    Yes.

  5. #5
    C++まいる!Cをこわせ!
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    Since you are new to pointers, I think it would be a good idea to teach you about smart pointers:
    std::shared_ptr<double> x = new double;
    (Requires C++0x.)
    Done. No need to delete.
    For arrays, you can do
    std::vector<double> x(2000);
    Done. No need to delete.
    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.

  6. #6
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    You're allocating memory on the heap. The new operator allocates the amount of memory specified and returns a pointer to that memory.

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