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

Why should you use strncpy instead of strcpy?

The strncpy() function was designed with a very particular problem in mind: manipulating strings stored in the manner of original UNIX directory entries. These used a short fixed-sized array (14 bytes), and a nul-terminator was only used if the filename was shorter than the array. That’s what’s behind the two oddities of strncpy(): It doesn’t … Read more

Variable declaration placement in C

It compiles successfully because GCC allows the declaration of s as a GNU extension, even though it’s not part of the C89 or ANSI standard. If you want to adhere strictly to those standards, you must pass the -pedantic flag. The declaration of c at the start of a { } block is part of … Read more

What is the difference between C, C99, ANSI C and GNU C?

Everything before standardization is generally called “K&R C”, after the famous book (1st edition and 2nd edition), with Dennis Ritchie, the inventor of the C language, as one of the authors. This was “the C language” from 1972-1989. The first C standard was released 1989 nationally in USA, by their national standard institute ANSI. This … Read more

What is the behavior of integer division?

Will result always be the floor of the division? What is the defined behavior? Not quite. It rounds toward 0, rather than flooring. 6.5.5 Multiplicative operators 6 When integers are divided, the result of the / operator is the algebraic quotient with any fractional part discarded.88) If the quotient a/b is representable, the expression (a/b)*b … Read more