INTRO(3) INTRO(3) NAME intro - introduction to library functions SYNOPSIS #include <stdio.h> #include <math.h> DESCRIPTION This section describes functions that may be found in vari- ous libraries, other than those functions that directly invoke UNIX system primitives, which are described in sec- tion 2. Functions are divided into various libraries dis- tinguished by the section number at the top of the page: (3) These functions, together with those of section 2 and those marked (3S) and (3M), constitute library libc, which is automatically loaded by the C compiler cc(1) and the Fortran compiler f77(1). The link editor ld(1) searches this library under option -lc . Declarations for some of these functions may be obtained from include files indicated on the appropriate pages. (3F) These functions are in the Fortran library, libF77, automatically loaded by the Fortran compiler, and searched under option -lF77 of the link editor. (3M) These functions constitute the math library, part of libc. (On other systems they must be loaded by -lm). Declarations for these functions may be obtained from the include file <math.h>. (3S) These functions constitute the `standard IO package', see stdio(3), part of libc already mentioned. Decla- rations for these functions may be obtained from the include file <stdio.h>. (3X) Various specialized libraries have not been given dis- tinctive captions. Files in which such libraries are found are named on appropriate pages. FILES /lib/libc.a SEE ALSO stdio(3), nm(1), ld(1), cc(1), f77(1), intro(2) DIAGNOSTICS Functions in the math library (3M) may return conventional values when the function is undefined for the given INTRO(3) INTRO(3) arguments or when the value is not representable. In these cases the external variable errno (see intro(2)) is set to the value EDOM or ERANGE, defined in the include file <math.h>.