Quick notes to C programmers

Quick notes to C programmers:

• instead of macros use
•           - const or enum to de ne constants
•           - inline to prevent function call overload
•           - template to declare families of type and families of functions
• use new/delete instead of free/malloc (use delete[] for arrays)
• don't use void* and pointer arithmetic
• an explicit type conversion reveals an error of conception.
• avoid to use C style tables, use vectors instead.
• don't recode what is already available in the C++ standard library.
• variables can be declared anywhere: initialization can be done when variable is required.
• whenever a pointer cannot be zero, use a reference.
• when using derived class, destructors should be virtual.

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