variable not intialized but still has value?

This is a discussion on variable not intialized but still has value? within the C++ Programming forums, part of the General Programming Boards category; When I was messing around I just made this program to see what would happen- Code: #include <iostream> int main() ...

  1. #1
    _ Munkey01's Avatar
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    Exclamation variable not intialized but still has value?

    When I was messing around I just made this program to see what would happen-


    Code:
    #include <iostream>
    
    int main()
    {
        int x;
        std::cout << x;
        return 0;
    }
    and I got some strange number. Why is this?

  2. #2
    End Of Line Hammer's Avatar
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    A variable will always hold a value, in your case it's just undefined which is why you see garbage.

    The data you are seeing is what was left in that memory chunk by whatever wrote there before.
    When all else fails, read the instructions.
    If you're posting code, use code tags: [code] /* insert code here */ [/code]

  3. #3
    Banned frenchfry164's Avatar
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    if it hasn't been written to since you have turned on your computer does it equal 0?

  4. #4
    Registered User
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    french, not necessarily (at least I don't think so).

  5. #5
    Programming Sex-God Polymorphic OOP's Avatar
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    The only variables that are guaranteed to be initialized to 0 are variables and objects that are not on the stack or heap (unless another value is explicitly specified).

    For instance, globals are guaranteed to be initialized to 0.

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