strtod(3c)                 DG/UX 4.30                  strtod(3c)



     NAME
          strtod, atof - convert string to double-precision number

     SYNOPSIS
          double strtod (str, ptr)
          char *str, **ptr;

          double atof (str)
          char *str;

     DESCRIPTION
          strtod returns as a double-precision floating-point number
          the value represented by the character string pointed to by
          str.  The string is scanned up to the first unrecognized
          character.

          strtod recognizes an optional string of ``white-space''
          characters [as defined by isspace in ctype(3C)], then an
          optional sign, then a string of digits optionally containing
          a decimal point, then an optional e or E followed by an
          optional sign or space, followed by an integer.

          If the value of ptr is not (char **)NULL, a pointer to the
          character terminating the scan is returned in the location
          pointed to by ptr.  If no number can be formed, *ptr is set
          to str, and zero is returned.

          Atof(str) is equivalent to strtod(str, (char **)NULL).

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

     DIAGNOSTICS
          If the correct value would cause overflow, +HUGE (as defined
          in <math.h>) is returned (according to the sign of the
          value), and errno is set to ERANGE.
          If the correct value would cause underflow, zero is returned
          and errno is set to ERANGE.

















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