Where can one find the C89/C90 standards in PDF format?

You can find nice HTML versions of C89, C99, and C11, as well as some of the official draft PDF files they’re generated from, here:

http://port70.net/~nsz/c/

Some other useful direct links to free PDF files of the C89/C90, C99 and C11 standards are listed below:

C89/C90: https://www.pdf-archive.com/2014/10/02/ansi-iso-9899-1990-1/ansi-iso-9899-1990-1.pdf

C99:
http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1256.pdf

C11:
http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1570.pdf

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