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    STRTOD(3)           Linux Programmer's Manual           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  an  optional  plus
           (``+'')  or  minus  sign (``-'') followed by a sequence of
           digits optionally containing  a  decimal-point  character,
           optionally  followed by an exponent.  An exponent consists
           of an ``E'' or ``e'', followed  by  an  optional  plus  or
           minus sign, followed by a sequence of digits.

           Leading  white-space  characters in the string (as defined
           by the isspace(3) function) are skipped.

    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.

### SEE ALSO

atof, atoi, atol, strtol, strtoul,

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    STANDARDS
           The strtod function conforms to ANSI-C.

    BUGS
           This is a BSD manual page and may not reflect the  current
           Linux implementation.

    BSD Man Page               21 Aug 1994                          1

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