Do I need a default constructor?

Code:

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class CObjects
{
public:
       
        // default constructor
        CObjects() : mesh(0) { }
        CObjects(Mesh *m) { mesh = m; }
        ~CObjects() { }
};

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I don't understand if I include the default constructor but calling the wrong constructor accidentally, the program will collapse. But it won't compile if I don't include the default one. Could anyone shed some lights on this?
Thanks
Jack

It depends on the way you want to use your class. e.g. if you want to add objects of your class into a standard container then it is needed.

Quote:

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I include the default constructor but calling the wrong constructor accidentally, the program will collapse.

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That has nothing to do with the existence of a default constructor. It must be a bug somewhere else. e.g. in your example the default constructor initializes ( the non existent ) member mesh to 0 but you're probably not checking for 0 somewhere else.
Kurt