atof.3

Unix操作系统minix 2.0源码

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


NAME
     atof, atoi, atol - convert ASCII to numbers

SYNOPSIS
     #include <stdlib.h>

     double atof(const char *nptr)
     int atoi(const char *nptr)
     long atol(const char *nptr)

DESCRIPTION
     These functions convert a string pointed to by nptr to floating, integer,
     and  long  integer  representation  respectively.  The first unrecognized
     character ends the string.

     Atof recognizes an optional string of spaces, then an optional sign, then
     a  string  of  digits  optionally  containing  a  decimal  point, then an
     optional `e' or `E' followed by an optionally signed integer.

     Atoi and atol recognize an optional string of spaces,  then  an  optional
     sign, then a string of digits.

SEE ALSO
     strtol(3), strtod(3), scanf(3).

BUGS
     There are no provisions for overflow.

























                                May 15, 1985                                 1