STRTOD(3)               Library functions               STRTOD(3)

NAME
       strtod - convert ASCII string to double

SYNOPSIS
       #include <stdlib.h>

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

DESCRIPTION
       The  strtod() function converts the initial portion of the
       string pointed to by nptr to double representation.

       The expected form of the string is optional leading  white
       space  as  checked by isspace(3), an optional plus (``+'')
       or minus sign (``-'') followed by  a  sequence  of  digits
       optionally  containing  a decimal-point character, option-
       ally followed by an exponent.  An exponent consists of  an
       ``E''  or  ``e'',  followed  by  an optional plus or minus
       sign, followed by a non-empty sequence of digits.  If  the
       locale  is  not  "C"  or "POSIX", different formats may be
       used.

RETURN VALUES
       The strtod function returns the converted value, if any.

       If endptr is not NULL, a pointer to  the  character  after
       the last character used in the conversion is stored in the
       location referenced by endptr.

       If no conversion is performed, zero is  returned  and  the
       value  of  nptr  is  stored  in the location referenced by
       endptr.

       If the correct value would cause overflow, plus  or  minus
       HUGE_VAL is returned (according to the sign of the value),
       and ERANGE is stored in errno.  If the correct value would
       cause  underflow, zero is returned and ERANGE is stored in
       errno.

ERRORS
       ERANGE Overflow or underflow occurred.

CONFORMING TO
       ANSI C

SEE ALSO
       atof(3), atoi(3), atol(3), strtol(3), strtoul(3)

BSD Manual Page          March 4th, 1996                        1