array

This is a discussion on array within the C++ Programming forums, part of the General Programming Boards category; Hi there, How to allocate a 2 dimension array using "new" operator? How to pass a 2 dimension array to ...

  1. #1
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    Question array

    Hi there,

    How to allocate a 2 dimension array using "new" operator?
    How to pass a 2 dimension array to a function?
    Is pointer always 4 bytes long or depends on system?


    Thank you

  2. #2
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    type ** name;
    name = new type* [xlength];
    for(int i = 0; i < xlength; i++)
    {
    name[i] = new type[ylenght];
    }


    //passing 2D array to function
    foo(name);


    to my knowledge pointers are always 4 bytes long.

  3. #3
    Just because ygfperson's Avatar
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    does a command like
    Code:
    char dummy[390][435906];
    allocate 390*435906 bytes?(give or take a few)

  4. #4
    Skunkmeister Stoned_Coder's Avatar
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    does a command like
    Code:
    char dummy[390][435906];
    allocate 390*435906 bytes?(give or take a few)

    well that would be 390 pointers (4 bytes each) to 390 different allocated areas of 435906 bytes. So i guess the minimum memory being allocated is (390*4)+(390*435906) = about 167Mb
    Free the weed!! Class B to class C is not good enough!!
    And the FAQ is here :- http://faq.cprogramming.com/cgi-bin/smartfaq.cgi

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