atof(3C)                                                 atof(3C)



     NAME
          atof - convert 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 unrecog-
          nized character ends the conversion.  atof recognizes an op-
          tional 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)

     ERRORS
          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).


























     April, 1990                                                     1