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C standards

C (and C++) standards (as also C++ standards) are usually named after the year in which they were published.

For example C++98 was published in 1998.

C89/C90

The gcc option -std=c89 or -ansi enforces this standard.

Because this standard was ratified in 1990, it occasinally is referred to as C90.

Amendment 1 to C90 introduced wmemcpy.

AMD1 is an amendment to the C89/C90 standard:

A new standard

Apparently, C99 introduced among others

<threads.h>

gets() (already deprecated in C99) replaced with gets_s() because of security issues.

C17 is the same as C11 apart from corrections of defects.