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
          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.

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

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































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