The 18 standard headers

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The 18 standard headers are:

<assert.h>; -- for enforcing assertions when functions execute
<ctype.h>; -- for classifying characters
<errno.h>; -- for testing error codes reported by library functions
<float.h>; -- for testing floating-point type properties
<iso646.h>; -- for programming in ISO 646 variant character sets
<limits.h>; -- for testing integer type properties
<locale.h>; -- for adapting to different cultural conventions
<math.h>; -- for computing common mathematical functions
<setjmp.h>; -- for executing nonlocal goto statements
<signal.h>; -- for controlling various exceptional conditions
<stdarg.h>; -- for accessing a varying number of arguments
<stddef.h>; -- for defining several useful types and macros
<stdio.h>; -- for performing input and output
<stdlib.h>; -- for performing a variety of operations
<string.h>; -- for manipulating several kinds of strings
<time.h>; -- for converting between various time and date formats
<wchar.h>; -- for manipulating wide streams and several kinds of strings
<wctype.h>; -- for classifying wide characters