### 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.

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

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