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Diff for /gforth/float.fs between versions 1.31 and 1.37

version 1.31, 2000/08/09 20:04:05	version 1.37, 2002/10/27 09:57:10
Line 16	Line 16

\ You should have received a copy of the GNU General Public License	\ You should have received a copy of the GNU General Public License
\ along with this program; if not, write to the Free Software	\ along with this program; if not, write to the Free Software
\ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.	\ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.

\ 1 cells 4 = [IF]	\ 1 cells 4 = [IF]
\ ' cells Alias sfloats	\ ' cells Alias sfloats
Line 100 DOES> ( -- r )	Line 100 DOES> ( -- r )
IF '- emit THEN ;	IF '- emit THEN ;

: f. ( r -- ) \ float-ext f-dot	: f. ( r -- ) \ float-ext f-dot
\G Display (the floating-point number) @i{r} using fixed-point notation,	\G Display (the floating-point number) @i{r} without exponent,
\G followed by a space.	\G followed by a space.
f$ dup >r 0<	f$ dup >r 0<=
IF '0 emit	IF '0 emit
ELSE scratch r@ min type r@ precision - zeros THEN	ELSE scratch r@ min type r@ precision - zeros THEN
'. emit r@ negate zeros	'. emit r@ negate zeros
Line 110 DOES> ( -- r )	Line 110 DOES> ( -- r )
\ I'm afraid this does not really implement ansi semantics wrt precision.	\ I'm afraid this does not really implement ansi semantics wrt precision.
\ Shouldn't precision indicate the number of places shown after the point?	\ Shouldn't precision indicate the number of places shown after the point?

	\ Why do you think so? ANS Forth appears ambiguous on this point. -anton.

: fe. ( r -- ) \ float-ext f-e-dot	: fe. ( r -- ) \ float-ext f-e-dot
\G Display @i{r} using engineering notation, followed by a space.	\G Display @i{r} using engineering notation (with exponent dividable
	\G by 3), followed by a space.
f$ 1- s>d 3 fm/mod 3 * >r 1+ >r	f$ 1- s>d 3 fm/mod 3 * >r 1+ >r
scratch r@ min type '. emit scratch r> /string type	scratch r@ tuck min tuck - >r type r> zeros
	'. emit scratch r> /string type
'E emit r> . ;	'E emit r> . ;

: fs. ( r -- ) \ float-ext f-s-dot	: fs. ( r -- ) \ float-ext f-s-dot
\G Display @i{r} using scientific notation, followed by a space.	\G Display @i{r} using scientific notation (with exponent), followed
	\G by a space.
f$ 1-	f$ 1-
scratch over c@ emit '. emit 1 /string type	scratch over c@ emit '. emit 1 /string type
'E emit . ;	'E emit . ;
Line 175 IS interpreter-notfound	Line 180 IS interpreter-notfound
\G Divide 1.0e0 by @i{r1}.	\G Divide 1.0e0 by @i{r1}.
1.0e0 fswap f/ ;	1.0e0 fswap f/ ;

	get-current environment-wordlist set-current
	1.7976931348623157e308 FConstant max-float
	set-current

\ We now have primitives for these, so we need not define them	\ We now have primitives for these, so we need not define them

Line 214 IS interpreter-notfound	Line 222 IS interpreter-notfound
fnegate f~rel	fnegate f~rel
THEN ;	THEN ;

	2e 53e f fconstant fround-offset \ !! does f work correctly?

	: fround ( r1 -- r2 ) \ float f-round
	\G Round to nearest integral value. Break ties with round-to-even.
	\ assumes IEEE DP FP in round-to-even mode.
	\ for an explanation of this code read
	\ <2002Oct26.113823@a0.complang.tuwien.ac.at> ff.
	fdup f0> if
	fround-offset f- fround-offset f+
	else fdup f0< if \ leave 0e and -0e as is
	fround-offset f+ fround-offset f-
	then then ;

: f.s ( -- ) \ gforth f-dot-s	: f.s ( -- ) \ gforth f-dot-s
\G Display the number of items on the floating-point stack,	\G Display the number of items on the floating-point stack,
\G followed by a list of the items; TOS is the right-most item.	\G followed by a list of the items; TOS is the right-most item.

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Removed from v.1.31
changed lines
	Added in v.1.37