@node strtod, string
@subheading Syntax

@example
#include <stdlib.h>

double strtod(const char *s, char **endp);
@end example

@subheading Description

This function converts as many characters of @var{s} as look like a
floating point number into that number.  If @var{endp} is not a null
pointer, @code{*endp} is set to point to the first unconverted
character.

@subheading Return Value

The value the represented by @var{s}.

If a number represented by @var{s} doesn't fit into the range of values
representable by the type @code{double}, the function returns either
@code{-HUGE_VAL} (if @var{s} begins with the character @code{-}) or
@code{+HUGE_VAL}, and sets @code{errno} to @code{ERANGE}.

@subheading Portability

@portability ansi, posix

@subheading Example

@example
char *buf = "123ret";
char *bp;
double x = strtod(buf, &bp);
@end example