Primitive Plus was created on 2002-03-19.
A primitive data type is built into the language - int, char, long, etc. A non-primitive data type is am abstract data type that is built out of primitive data types - linked list, queue, stack, etc.
same the types used in C. that is int...char...float...
C++ evolved from C and therefore retains the concept of primitive variables inherited from C, including int and char. In 100% OOP languages such as Java, these primitives would be implemented as objects. But in C++, they are primitive in nature. That is, they have no built-in methods such as .ToString() associated with them.
Primitive types are usually passed be value (many professional programmers use reference or pointers). For object types is always used mechanism pass-by-reference because it allows to save a lot of memory by preventing coping data.
Entities are the objects instantiated by your program, both at compile time and at runtime. Some objects are primitive data types, others are more complex such as objects instantiated from a class.
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