| DOES> ( -- r ) |
DOES> ( -- r ) |
| f@ ; |
f@ ; |
| |
|
| : fdepth ( -- n ) fp0 @ fp@ - [ 1 floats ] Literal / ; |
: fdepth ( -- +n ) \ floating f-depth |
| |
\G +n is the current number of (floating-point) values on the |
| |
\G floating-point stack. |
| |
fp0 @ fp@ - [ 1 floats ] Literal / ; |
| |
|
| : FLit ( -- r ) r> dup f@ float+ >r ; |
: FLit ( -- r ) r> dup f@ float+ >r ; |
| : FLiteral ( r -- ) |
: FLiteral ( compilation r -- ; run-time -- r ) \ float |
| |
\G Compile appropriate code such that, at run-time, r is placed |
| |
\G on the (floating-point) stack. Interpretation semantics are undefined. |
| BEGIN here cell+ dup faligned <> WHILE postpone noop REPEAT |
BEGIN here cell+ dup faligned <> WHILE postpone noop REPEAT |
| postpone FLit f, ; immediate |
postpone FLit f, ; immediate |
| |
|
| &15 Value precision |
&15 Value precision ( -- u ) \ floating-ext |
| : set-precision to precision ; |
\G u is the number of significant digits currently used by |
| |
\G @code{F.} @code{FE.} and @code{FS.} |
| |
: set-precision ( u -- ) \ floating-ext |
| |
\G Set the number of significant digits currently used by |
| |
\G @code{F.} @code{FE.} and @code{FS.} to u. |
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to precision ; |
| |
|
| : scratch ( r -- addr len ) |
: scratch ( r -- addr len ) |
| pad precision - precision ; |
pad precision - precision ; |
| IF 2drop scratch 3 min type rdrop EXIT THEN |
IF 2drop scratch 3 min type rdrop EXIT THEN |
| IF '- emit THEN ; |
IF '- emit THEN ; |
| |
|
| : f. ( r -- ) f$ dup >r 0< |
: f. ( r -- ) \ floating-ext f-dot |
| |
\G Display (the floating-point number) r using fixed-point notation, |
| |
\G followed by a space. |
| |
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? |
| |
|
| : fe. ( r -- ) f$ 1- s>d 3 fm/mod 3 * >r 1+ >r |
: fe. ( r -- ) \ floating-ext f-e-dot |
| |
\G Display r using engineering notation, followed by a space. |
| |
f$ 1- s>d 3 fm/mod 3 * >r 1+ >r |
| scratch r@ min type '. emit scratch r> /string type |
scratch r@ min type '. emit scratch r> /string type |
| 'E emit r> . ; |
'E emit r> . ; |
| |
|
| : fs. ( r -- ) f$ 1- |
: fs. ( r -- ) \ floating-ext f-s-dot |
| |
\G Display r using scientific notation, followed by a space. |
| |
f$ 1- |
| scratch over c@ emit '. emit 1 /string type |
scratch over c@ emit '. emit 1 /string type |
| 'E emit . ; |
'E emit . ; |
| |
|
| Create 0.0E0 f, ; |
Create 0.0E0 f, ; |
| \ does> ( -- f-addr ) |
\ does> ( -- f-addr ) |
| |
|
| 1.0e0 fasin 2.0e0 f* fconstant pi |
1.0e0 fasin 2.0e0 f* fconstant pi ( -- r ) \ gforth |
| |
\G FCONSTANT: r is the value pi; the ratio of a circle's area |
| : f2* 2.0e0 f* ; |
\G to its diameter. |
| : f2/ 0.5e0 f* ; |
|
| : 1/f 1.0e0 fswap f/ ; |
: f2* ( r1 -- r2 ) \ gforth |
| |
\G Multiply r1 by 2.0e0 |
| |
2.0e0 f* ; |
| |
|
| |
: f2/ ( r1 -- r2 ) \ gforth |
| |
\G Multiply r1 by 0.5e0 |
| |
0.5e0 f* ; |
| |
|
| |
: 1/f ( r1 -- r2 ) \ gforth |
| |
\G Divide 1.0e0 by r1 |
| |
1.0e0 fswap f/ ; |
| |
|
| |
|
| \ We now have primitives for these, so we need not define them |
\ We now have primitives for these, so we need not define them |
| THEN |
THEN |
| f< ; |
f< ; |
| |
|
| : f.s ." <" fdepth 0 .r ." > " fdepth 0 max maxdepth-.s @ min dup 0 |
: f.s ( -- ) \ gforth f-dot-s |
| |
\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. |
| |
." <" fdepth 0 .r ." > " fdepth 0 max maxdepth-.s @ min dup 0 |
| ?DO dup i - 1- floats fp@ + f@ f. LOOP drop ; |
?DO dup i - 1- floats fp@ + f@ f. LOOP drop ; |
