why does my code crash

This is a discussion on why does my code crash within the C++ Programming forums, part of the General Programming Boards category; Code: #include <iostream> using namespace std; struct Measurements { int lenght; int width; int height; //need a constructor Measurements() { ...

  1. #1
    Registered User
    Join Date
    Nov 2002
    Posts
    319

    why does my code crash

    Code:
    #include <iostream>
    using namespace std;
    
    struct Measurements
    {
    int lenght;
    int width;
    int height;
    //need a constructor
    
    Measurements()
    {
    lenght = 1;
    width = 2;
    height = 3;
    }
    
    }; 
    
    //its not much code , but why would this crash
    int main()
    {
    Measurements *Measure;    
    cout<<Measure->height<<endl;
    return 0;
    }

  2. #2
    Just Lurking Dave_Sinkula's Avatar
    Join Date
    Oct 2002
    Posts
    5,006
    Measure is an uninitialized pointer.
    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
    Bond sunnypalsingh's Avatar
    Join Date
    Oct 2005
    Posts
    162
    Do this
    Code:
    Measurements *Measure=new Measurements;

  4. #4
    Registered User
    Join Date
    Jan 2006
    Posts
    19
    Don't you need to create an instance of the structure in main, or is that just classes?

  5. #5
    Registered User
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    Aug 2005
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    1,267
    Messages is a pointer -- and all pointers must be initialized before they can be used. In c++, structures and classes are nearly identical.

  6. #6
    Registered User
    Join Date
    Jan 2005
    Posts
    7,338
    In this simple example, there is no reason to use a pointer at all. Declare Measure as a local variable, and access the height as Measure.height.

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