atof(3C)                                                 atof(3C)



NAME
     atof - converts an ASCII string to floating-point number

SYNOPSIS
     double atof(nptr)
     char *nptr;

DESCRIPTION
     atof converts a character string pointed to by nptr to a
     double-precision floating point number.  The first
     unrecognized character ends the conversion.  atof recognizes
     an optional string of white space characters (blanks or
     tabs), 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.  If the string
     begins with an unrecognized character, atof returns the
     value zero.

          atof(str)

     is equivalent to

          strtod(str,(char **)NULL)

STATUS MESSAGES AND VALUES
     When the correct value would overflow, atof returns HUGE,
     and sets errno to ERANGE.  Zero is returned on underflow.

SEE ALSO
     scanf(3S), strtod(3C), strtol(3C)

























January 1992                                                    1