4.4BSD/usr/share/man/cat3/atof.0

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ATOF(3)                     BSD Programmer's Manual                    ATOF(3)

NNAAMMEE
     aattooff - convert ASCII string to double

SSYYNNOOPPSSIISS
     ##iinncclluuddee <<ssttddlliibb..hh>>

     _d_o_u_b_l_e
     aattooff(_c_o_n_s_t _c_h_a_r _*_n_p_t_r);

DDEESSCCRRIIPPTTIIOONN
     The aattooff() function converts the initial portion of the string pointed to
     by _n_p_t_r to _d_o_u_b_l_e representation.

     It is equivalent to:

           strtod(nptr, (char **)NULL);

SSEEEE AALLSSOO
     atoi(3),  atol(3),  strtod(3),  strtol(3),  strtoul(3)

SSTTAANNDDAARRDDSS
     The aattooff() function conforms to ANSI C X3.159-1989 (``ANSI C '').

BBUUGGSS
     This manual page represents intent instead of actual practice.  While it
     is intended that aattooff() be implemented using strtod(3),  this has not yet
     happened.  In the current system, aattooff() translates a string in the fol-
     lowing form to a double: a string of leading white space, possibly fol-
     lowed by a sign (``+'' or ``-''), followed by a digit string which may
     contain one decimal point (``.''), which may be followed by either of the
     exponent flags (``E'' or ``e''), and lastly, followed by a signed or un-
     signed integer.

4.4BSD                           June 4, 1993                                1