Are struct and union composite data types or user-defined data types?

Question

Debojit Acharjee 455

I want to know whether struct and union composite data types or user-defined data types?

What is the difference between a composite and user-defined data types?

David Lowndes 2,640 Reputation points MVP

2023-06-01T13:46:21+00:00

These types of questions are probably best answered by typing the question into your favourite search engine - which will take you to articles such as this, and this.
RLWA32 49,536 Reputation points

2023-06-01T14:05:53.2466667+00:00

@Debojit Acharjee Please stop tagging questions about C/C++ with the C# tag.
Minxin Yu 13,501 Reputation points Microsoft External Staff

2023-06-06T09:41:03.8633333+00:00

From wiki

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.

Do you have any questions about the answers below?

1 answer

David Lowndes 2,640 Reputation points MVP

2023-06-01T13:46:21+00:00

These types of questions are probably best answered by typing the question into your favourite search engine - which will take you to articles such as this, and this.
RLWA32 49,536 Reputation points

2023-06-01T14:05:53.2466667+00:00

@Debojit Acharjee Please stop tagging questions about C/C++ with the C# tag.
Minxin Yu 13,501 Reputation points Microsoft External Staff

2023-06-06T09:41:03.8633333+00:00

From wiki

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.

Do you have any questions about the answers below?

Answer 1

Bruce (SqlWork.com) 77,686 Volunteer Moderator

A user defined type is any type that is not built in. You can use enum, typedef, struct, and union to define a user defined type.

a composite type, is a type that holds multiple types. A struct or a union can define a composite type.