Classes and Structs — What’s the Difference?

The keywords struct and class are almost interchangeable in C++. You can declare a struct that has member functions, constructors, destructor, base classes and so on as if it were a class. Likewise, it’s possible to create a class that has only public data members. The only difference between a struct and a class is in the default access. By default, all the members of a struct are public whereas in a class, al the members are private. The same is true for the default inheritance type: a struct entails public inheritance by default whereas a class entails private inheritance. The struct keyword struct exists for the sake of backward compatibility with C.

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