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Composite data type
In computer science, a composite data type or compound data type is any data type which can be constructed in a program using the programming language's primitive data types and other composite types. The act of constructing a composite type is known as composition.
==C/C++ structures and classes==
A struct is C's and C++'s notion of a composite type, a datatype that composes a fixed set of labeled fields or members. It is so called because of the struct keyword used in declaring them, which is short for ''structure'' or, more precisely, ''user-defined data structure''.
In C++, the only difference between a struct and a class is the default access level, which is ''private'' for classes and ''public'' for structs.
Note that while classes and the class keyword were completely new in C++, the C programming language already had a crude type of structs. For all intents and purposes, C++ structs form a superset of C structs: virtually all valid C structs are valid C++ structs with the same semantics.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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