C notes

References

Pre-standard C

• K&R (1978) B. W. Kernighan & D. M. Ritchie. The C Programming Language.

C89

• K&R, 2e (1988)

C99

• P. J. Plauger. The Standard C Library.

C11

The standard library

ctype.h

Only for unsigned chars (converted to int) and EOF.

• Predicates:
  • iscntrl and isprint are complementary.
  • ' ' ∈ isblank ⊂ isspace.
  • isprint = isgraph + ' '.
  • isgraph = ispunct + isalnum.
  • isalnum = isalpha + isdigit.
  • isalpha = isupper + islower.
  • isxdigit.
• Convertors:
  • toupper, tolower.

locale.h

‘The simplest way to use locales is to ignore them. Every standard C program starts up in the "C" locale.’

[Plauger, p. 88]