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C++ Programming/Structures - Structures. 1  A structure is a compound data type that contains different members of different types. The members are accessed by their names. 2  A struct is defined by... 3  The optional keywords public:, protected:, private: declare the protection status of the following members.
changes). As in C, C++ programs start with a main() function. All of Câs keywords and functions work just ne in C++. Even ommand-line arguments argc and argv, are still supported in C++. In fact, with only a few tweaks here and there, your C programs should run quite well in the C++ world. 1.1 Function Prototypes Are Required In C, function prototypes are optional, or at least C assumes that they defer to type int if they are not declared. As long as thereâs no type con ict between a function call and the same functionâs declaration, your program will compile. In C++, a function prototype is required for each of your programâs func-