+@deftypefn Supplemental double strtod (const char *@var{string}, char **@var{endptr})
+
+This ISO C function converts the initial portion of @var{string} to a
+@code{double}. If @var{endptr} is not @code{NULL}, a pointer to the
+character after the last character used in the conversion is stored in
+the location referenced by @var{endptr}. If no conversion is
+performed, zero is returned and the value of @var{string} is stored in
+the location referenced by @var{endptr}.
+
+@end deftypefn
+
+*/
+
+#include "ansidecl.h"
+#include "safe-ctype.h"
+
+extern double atof (const char *);