C++ handles uninitialized variables

This is a discussion on C++ handles uninitialized variables within the C++ Programming forums, part of the General Programming Boards category; Can you help me, explain question this, i dont understand it How does C++ handles uninitialized variables? thanks....

  1. #1
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    Question C++ handles uninitialized variables

    Can you help me, explain question this, i dont understand it

    How does C++ handles uninitialized variables?


    thanks.

  2. #2
    Guest Sebastiani's Avatar
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    It doesn't (unless the variable is a non-POD, in which case the defaut constructor is invoked).

  3. #3
    ...and never returned. StainedBlue's Avatar
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    Space large enough for the particular data-type is allocated on the stack, but consequently the value of that stack space is left unchanged. It is not zero or some common arbitrary value, it is whatever was there to begin with.

    Try the following and see what you get:
    Code:
    #include <iostream>
    
    int main()
    {
      int num;
      std::cout << num << "\n";
      return 0;
    }
    Your output will be some seemingly random numbers, and it will differ from what I get, or anyone else gets.

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    thanks you, but can you detail it more

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    Guest Sebastiani's Avatar
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    Quote Originally Posted by akaile View Post
    thanks you, but can you detail it more
    How could one possibly elaborate on the statement "it doesn't"?

    Nothing happens. No code is executed. Not a single bit is disturbed.

    Clear enough now?

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    thanks all

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