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Unix Version 7 - man page for intro (v7 section 3)

INTRO(3)			     Library Functions Manual				 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 various libraries, other than those
       functions that directly invoke UNIX system primitives, which are described in  section  2.
       Functions  are  divided	into various libraries distinguished by the section number at the
       top of the page:

       (3)   These functions, together with those of section 2 and those marked (3S),  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  the  `-lc'
	     option.  Declarations for some of these functions may be obtained from include files
	     indicated on the appropriate pages.

       (3M)  These functions constitute the math library, libm.  They are automatically loaded as
	     needed  by the Fortran compiler f77(1).  The link editor searches this library under
	     the `-lm' option.	Declarations for these functions may be obtained from the include
	     file <math.h>.

       (3S)  These  functions  constitute  the `standard I/O package', see stdio(3).  These func-
	     tions are in the library libc already mentioned.  Declarations for  these	functions
	     may be obtained from the include file <stdio.h>.

       (3X)  Various  specialized  libraries have not been given distinctive captions.	The files
	     in which these libraries are found are named on the appropriate pages.

FILES
       /lib/libc.a
       /lib/libm.a, /usr/lib/libm.a (one or the other)

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 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.  The values
       of EDOM and ERANGE are defined in the include file <math.h>.

ASSEMBLER
       In assembly language these functions may be accessed by simulating the C calling sequence.
       For example, ecvt(3) might be called this way:

	      setd
	      mov  $sign,-(sp)
	      mov  $decpt,-(sp)
	      mov  ndigit,-(sp)
	      movf value,-(sp)
	      jsr  pc,_ecvt
	      add  $14.,sp

											 INTRO(3)


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