What does struct do in C?

A struct in the C programming language (and many derivatives) is a composite data type (or record) declaration that defines a physically grouped list of variables under one name in a block of memory, allowing the different variables to be accessed via a single pointer or by the struct declared name which returns the …

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What is _t in C?

The _t usually wraps an opaque type definition . GCC merely add names that end with _t to the reserved namespace you may not use, to avoid conflicts with future versions of Standard C and POSIX (GNU C library manual).

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Is typedef struct needed in C?

Not so in the C programming language. The use of typedef most often serves no purpose but to obfuscate the data structure usage . Since only { struct (6), enum (4), union (5) } number of keystrokes are used to declare a data type there is almost no use for the aliasing of the struct.

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What is a typedef struct?

The C language contains the typedef keyword to allow users to provide alternative names for the primitive (e.g.,​ int) and user-defined​ (e.g struct) data types . Remember, this keyword adds a new name for some existing data type but does not create a new type.

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