strtod(3C)              LIBRARY FUNCTIONS              strtod(3C)



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

SYNOPSIS
     #include <stdlib.h>

     double strtod (const char *nptr, char **endptr);

     double atof (const char *nptr);

DESCRIPTION
     strtod returns as a double-precision  floating-point  number
     the  value represented by the character string pointed to by
     nptr.  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  character, then an optional exponent part
     including an e or E followed by an optional  sign,  followed
     by an integer.

     If the value of endptr is not (char **)NULL,  a  pointer  to
     the  character terminating the scan is returned in the loca-
     tion pointed to by endptr.  If  no  number  can  be  formed,
     *endptr is set to nptr, and zero is returned.

     atof(nptr) is equivalent to:
          strtod(nptr, (char **)NULL).

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

DIAGNOSTICS
     If the correct value would cause overflow, +HUGE 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.
     When the -Xc or -Xa compilation options are  used,  HUGEVAL
     is returned instead of HUGE.













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