| |
|
| \ 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 |
| : f. ( r -- ) \ float-ext f-dot |
: f. ( r -- ) \ float-ext f-dot |
| \G Display (the floating-point number) @i{r} without exponent, |
\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 |
| \ 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 (with exponent dividable |
\G Display @i{r} using engineering notation (with exponent dividable |
| \G by 3), followed by a space. |
\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 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 |
| |
|
| 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. |
