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1.1     ! root        1: .TH INTRO 3
        !             2: .SH NAME
        !             3: intro \(mi introduction to library functions
        !             4: .SH SYNOPSIS
        !             5: .nf
        !             6: .B #include <libc.h>
        !             7: .PP
        !             8: .B #include <stdio.h>
        !             9: .PP
        !            10: .B #include <math.h>
        !            11: .fi
        !            12: .SH DESCRIPTION
        !            13: This section describes functions that may be found
        !            14: in various libraries, other than the system calls
        !            15: described in section 2.
        !            16: Functions are divided into various libraries distinguished
        !            17: by the section number at the top of the page:
        !            18: .TP 
        !            19: (3)
        !            20: These functions, together with those of section 2 and those
        !            21: marked (3S) and (3M), constitute library
        !            22: .I libc,
        !            23: which is automatically loaded by the C compiler
        !            24: .IR cc (1)
        !            25: and the Fortran compiler
        !            26: .IR f77 (1).
        !            27: The same functions appear also in
        !            28: .IR libC,
        !            29: which is automatically loaded by the C++ compiler; see
        !            30: .IR c++ (1).
        !            31: The link editor
        !            32: .IR ld (1)
        !            33: searches this library under option
        !            34: .BR \-lc 
        !            35: .RB ( -lC
        !            36: for 
        !            37: .IR libC ).
        !            38: Declarations for some of these functions may be obtained
        !            39: from include files indicated on the appropriate pages.
        !            40: Other declarations can be found in
        !            41: .FR <libc.h> .
        !            42: .TP
        !            43: (3F)
        !            44: These functions are in the Fortran library,
        !            45: .I libF77,
        !            46: automatically loaded by the Fortran compiler, and searched
        !            47: under option
        !            48: .B -lF77
        !            49: of the link editor.
        !            50: .TP
        !            51: (3M)
        !            52: These functions constitute the math library, part of
        !            53: .I libc.
        !            54: (On some other systems they must be loaded by
        !            55: .BR -lm ).
        !            56: Declarations for these functions may be obtained from
        !            57: the include file
        !            58: .FR <math.h> .
        !            59: .TP
        !            60: (3S)
        !            61: These functions constitute the
        !            62: `standard IO package'
        !            63: (see
        !            64: .IR stdio (3))
        !            65: part of
        !            66: .I libc
        !            67: already mentioned.
        !            68: Declarations for these functions may be obtained from
        !            69: the include file
        !            70: .FR <stdio.h> .
        !            71: .TP
        !            72: (3X)
        !            73: Various
        !            74: specialized libraries have not been given distinctive
        !            75: captions.
        !            76: Files in which such libraries are found are named
        !            77: on appropriate pages.
        !            78: .TP
        !            79: (3+)
        !            80: C++ functions in
        !            81: .I libC
        !            82: that are not in
        !            83: .I libc.
        !            84: .SH FILES
        !            85: .TP
        !            86: .F /lib/libc.a
        !            87: .SH SEE ALSO
        !            88: .IR stdio (3),
        !            89: .IR nm (1), 
        !            90: .IR ld (1), 
        !            91: .IR cc (1),
        !            92: .IR c++ (1), 
        !            93: .IR f77 (1), 
        !            94: .IR intro (2)
        !            95: .SH DIAGNOSTICS
        !            96: Functions in the math library (3M) may return
        !            97: conventional values when the function is undefined for the
        !            98: given arguments or when the value is not representable.
        !            99: In these cases the external variable
        !           100: .I errno
        !           101: (see
        !           102: .IR intro (2))
        !           103: is set to the value
        !           104: .B EDOM
        !           105: or
        !           106: .BR ERANGE ,
        !           107: defined in
        !           108: the include file
        !           109: .FR <math.h> .

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