Home » Personal collection » Acorn DFS disks » dfs_box03_disk13_bcpl_calc.scp » EXCL2B
EXCL2B
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.
| Tape/disk: | Home » Personal collection » Acorn DFS disks » dfs_box03_disk13_bcpl_calc.scp |
| Filename: | EXCL2B |
| Read OK: | ✔ |
| File size: | 1924 bytes |
| Load address: | 21DFC |
| Exec address: | 0006 |
File contents
SECTION "EXCL2B"
// Floating/fixed point calculator - common procedures 2.
// The calculation procedures used are
// copyright Richards Computer Products Ltd. (C) 1983
// Written by C Jobson 19/04/83
// Contains GETCH and GETNUM.
GET "LIBHDR"
GET "FPHDR"
GET "EXCLHDR"
// GETCH is called to read the next keystroke. The character read is
// stored in CH and its classification is stored in CHTYPE. For
// convenience the result of the procedure is also CHTYPE. Invalid
// keystrokes are ignored and ';' and ':' are converted to '+' and '*'
// respectively. The swapping of functions by pressing f0 is handled
// entirely within this procedure.
LET GETCH() = VALOF
$( CH := CAPCH(RDBIN()) // treat e and x like E and X
SWITCHON CH INTO
$( CASE 'X': // exit
MODE(7) // to restore cursor
STOP(0)
CASE '=': CASE 13: // 13 is RETURN
CHTYPE := T.EQUALS
ENDCASE
CASE ';': // convert ';' to '+'
CH := '+'
CASE '+':
CHTYPE := T.OP
ENDCASE
CASE ':': // convert ':' to '*'
CH := '**'
CASE '**': CASE '/':
CHTYPE := T.OP
ENDCASE
CASE 127: // 127 is delete
CHTYPE := T.CLEAR
ENDCASE
CASE '-':
CHTYPE := T.MINUS
ENDCASE
CASE '0': CASE '1': CASE '2': CASE '3': CASE '4':
CASE '5': CASE '6': CASE '7': CASE '8': CASE '9':
CASE 'E': CASE '.':
CHTYPE := T.NUMCH
ENDCASE
CASE FIRSTFN: // f0 is always used to swap functions
FNSET := (FNSET+1) REM (FNSETMAX+1)
DISPFNS() // display new functions & update MAXFN
LOOP // back for next character
DEFAULT:
TEST FIRSTFN+1 <= CH <= MAXFN THEN
CHTYPE := INTERPFN() // if valid function key interpret it
ELSE
LOOP // invalid character - ignore it
$)
RESULTIS CHTYPE
$) REPEAT
// GETNUM is called to read a number. While a number is being read in
// it is displayed as typed (rather than in a standard format). The
// 'clear' function is handled entirely within this procedure. On
// entry CH contains the first character of the number. On exit the
// next character read should be the terminator of the number.
AND GETNUM(NUM) BE
$( LET COUNT = 0 // number of characters read
LET NEG.VALID = STATE = S.NUM2 & (OP='**' | OP='/')
// true if leading '-' is allowed (e.g. in
// situations such as '123 * -456 ='
LET NUMSTR = VEC NUMWIDTH/2
// holds the characters typed in (up to 17)
LET NUMVEC = VEC FP.LEN
$( SWITCHON CHTYPE INTO
$(
// Function like pi or e - overwrite any characters entered
// already (but allow for cases like '123 * -pi') and return.
CASE T.NUMOP:
FUNCOP(NUM) // get the value
IF COUNT=1 & NUMSTR%1 = '-' THEN
FNEG(NUM, NUM)
WRITENUM(NUM, 0) // display it
RETURN
// Effect of clear depends on whether any characters entered
// yet - if so just cancel them - if not do a reset.
CASE T.CLEAR:
IF COUNT = 0 THEN
RESET() // which LONGJUMPS back to START
COUNT := 0
ENDCASE
// Handle other cases. '-' entered as first character is a
// special case - it may be valid (e.g. in '123 * -456'). If
// it is not valid then it must be treated as an operator
// entered when a number was expected. In such a case jump
// back to START having first 'unread' the character so that
// it can be processed in the normal way.
DEFAULT:
IF (CH = '-') & (COUNT = 0) & (NOT NEG.VALID) THEN
$( UNRDCH()
LONGJUMP(RES.LEV, RES.LAB)
$)
// Set up string of characters entered so far and see if
// it forms a valid number. If this is the 18th character
// it replaces the 17th provided that it is valid.
FPEXCEP := 0
TEST COUNT = NUMWIDTH THEN
$( LET OLDCH = NUMSTR%NUMWIDTH
NUMSTR%NUMWIDTH := CH
FLIT(NUMSTR, NUMVEC)
// If invalid replace old 17th character else decrement
// code so code below (which increments it) works.
TEST FPEXCEP NE 0 THEN
NUMSTR%NUMWIDTH := OLDCH
ELSE
COUNT := NUMWIDTH-1
$)
ELSE
$( NUMSTR%(COUNT+1) := CH
NUMSTR%0 := COUNT+1
FLIT(NUMSTR, NUMVEC)
$)
// If string not a valid number but last character entered
// is a numeric character (i.e. 0-9, E or '.') then just
// ignore it. Otherwise treat the invalid character as
// terminating the number so 'unread' it. If no
// characters have been entered (or only '-' has been
// entered) then LONGJUMP back to START as if this
// procedure had never been called. Otherwise return the
// number entered.
IF FPEXCEP NE 0 THEN
$( IF CHTYPE = T.NUMCH THEN
ENDCASE // ignore invalid numeric characters
UNRDCH()
IF COUNT = 0 | (COUNT = 1 & NUMSTR%1 = '-') THEN
LONGJUMP(RES.LEV, RES.LAB)
NUMSTR%0 := COUNT // ignore latest character
FLIT(NUMSTR, NUM) // set up NUM
RETURN
$)
// Character valid so leave it in string.
COUNT := COUNT+1
$)
// Display string and go back to get next character (but display
// an empty string as '0').
NUMPOS() // position cursor
WRBIN(137) // cancel flashing
FOR J = 1 TO (COUNT=0 -> NUMWIDTH-1, NUMWIDTH-COUNT) DO
WRCH('*S')
TEST COUNT = 0 THEN
WRCH('0')
ELSE
FOR J = 1 TO COUNT DO
WRCH(NUMSTR%J)
COPYL1L2() // 2nd line of double height display
GETCH()
$) REPEAT
$)
00000000 53 45 43 54 49 4f 4e 20 22 45 58 43 4c 32 42 22 |SECTION "EXCL2B"|
00000010 0d 0a 0d 0a 2f 2f 20 46 6c 6f 61 74 69 6e 67 2f |....// Floating/|
00000020 66 69 78 65 64 20 70 6f 69 6e 74 20 63 61 6c 63 |fixed point calc|
00000030 75 6c 61 74 6f 72 20 2d 20 63 6f 6d 6d 6f 6e 20 |ulator - common |
00000040 70 72 6f 63 65 64 75 72 65 73 20 32 2e 0d 0a 2f |procedures 2.../|
00000050 2f 20 54 68 65 20 63 61 6c 63 75 6c 61 74 69 6f |/ The calculatio|
00000060 6e 20 70 72 6f 63 65 64 75 72 65 73 20 75 73 65 |n procedures use|
00000070 64 20 61 72 65 0d 0a 2f 2f 20 63 6f 70 79 72 69 |d are..// copyri|
00000080 67 68 74 20 52 69 63 68 61 72 64 73 20 43 6f 6d |ght Richards Com|
00000090 70 75 74 65 72 20 50 72 6f 64 75 63 74 73 20 4c |puter Products L|
000000a0 74 64 2e 20 28 43 29 20 31 39 38 33 0d 0a 2f 2f |td. (C) 1983..//|
000000b0 20 57 72 69 74 74 65 6e 20 62 79 20 43 20 4a 6f | Written by C Jo|
000000c0 62 73 6f 6e 20 20 31 39 2f 30 34 2f 38 33 0d 0a |bson 19/04/83..|
000000d0 0d 0a 2f 2f 20 43 6f 6e 74 61 69 6e 73 20 47 45 |..// Contains GE|
000000e0 54 43 48 20 61 6e 64 20 47 45 54 4e 55 4d 2e 0d |TCH and GETNUM..|
000000f0 0a 0d 0a 47 45 54 20 22 4c 49 42 48 44 52 22 0d |...GET "LIBHDR".|
00000100 0a 47 45 54 20 22 46 50 48 44 52 22 0d 0a 47 45 |.GET "FPHDR"..GE|
00000110 54 20 22 45 58 43 4c 48 44 52 22 0d 0a 0d 0a 0d |T "EXCLHDR".....|
00000120 0a 2f 2f 20 47 45 54 43 48 20 69 73 20 63 61 6c |.// GETCH is cal|
00000130 6c 65 64 20 74 6f 20 72 65 61 64 20 74 68 65 20 |led to read the |
00000140 6e 65 78 74 20 6b 65 79 73 74 72 6f 6b 65 2e 20 |next keystroke. |
00000150 20 54 68 65 20 63 68 61 72 61 63 74 65 72 20 72 | The character r|
00000160 65 61 64 20 69 73 0d 0a 2f 2f 20 73 74 6f 72 65 |ead is..// store|
00000170 64 20 69 6e 20 43 48 20 61 6e 64 20 69 74 73 20 |d in CH and its |
00000180 63 6c 61 73 73 69 66 69 63 61 74 69 6f 6e 20 69 |classification i|
00000190 73 20 73 74 6f 72 65 64 20 69 6e 20 43 48 54 59 |s stored in CHTY|
000001a0 50 45 2e 20 20 46 6f 72 0d 0a 2f 2f 20 63 6f 6e |PE. For..// con|
000001b0 76 65 6e 69 65 6e 63 65 20 74 68 65 20 72 65 73 |venience the res|
000001c0 75 6c 74 20 6f 66 20 74 68 65 20 70 72 6f 63 65 |ult of the proce|
000001d0 64 75 72 65 20 69 73 20 61 6c 73 6f 20 43 48 54 |dure is also CHT|
000001e0 59 50 45 2e 20 20 49 6e 76 61 6c 69 64 0d 0a 2f |YPE. Invalid../|
000001f0 2f 20 6b 65 79 73 74 72 6f 6b 65 73 20 61 72 65 |/ keystrokes are|
00000200 20 69 67 6e 6f 72 65 64 20 61 6e 64 20 27 3b 27 | ignored and ';'|
00000210 20 61 6e 64 20 27 3a 27 20 61 72 65 20 63 6f 6e | and ':' are con|
00000220 76 65 72 74 65 64 20 74 6f 20 27 2b 27 20 61 6e |verted to '+' an|
00000230 64 20 27 2a 27 0d 0a 2f 2f 20 72 65 73 70 65 63 |d '*'..// respec|
00000240 74 69 76 65 6c 79 2e 20 20 54 68 65 20 73 77 61 |tively. The swa|
00000250 70 70 69 6e 67 20 6f 66 20 66 75 6e 63 74 69 6f |pping of functio|
00000260 6e 73 20 62 79 20 70 72 65 73 73 69 6e 67 20 66 |ns by pressing f|
00000270 30 20 69 73 20 68 61 6e 64 6c 65 64 0d 0a 2f 2f |0 is handled..//|
00000280 20 65 6e 74 69 72 65 6c 79 20 77 69 74 68 69 6e | entirely within|
00000290 20 74 68 69 73 20 70 72 6f 63 65 64 75 72 65 2e | this procedure.|
000002a0 0d 0a 0d 0a 4c 45 54 20 47 45 54 43 48 28 29 20 |....LET GETCH() |
000002b0 3d 20 56 41 4c 4f 46 0d 0a 24 28 20 43 48 20 3a |= VALOF..$( CH :|
000002c0 3d 20 43 41 50 43 48 28 52 44 42 49 4e 28 29 29 |= CAPCH(RDBIN())|
000002d0 20 20 20 20 2f 2f 20 74 72 65 61 74 20 65 20 61 | // treat e a|
000002e0 6e 64 20 78 20 6c 69 6b 65 20 45 20 61 6e 64 20 |nd x like E and |
000002f0 58 0d 0a 20 20 20 53 57 49 54 43 48 4f 4e 20 43 |X.. SWITCHON C|
00000300 48 20 49 4e 54 4f 0d 0a 20 20 20 24 28 20 43 41 |H INTO.. $( CA|
00000310 53 45 20 27 58 27 3a 20 20 20 20 20 20 20 20 20 |SE 'X': |
00000320 20 20 20 2f 2f 20 65 78 69 74 0d 0a 20 20 20 20 | // exit.. |
00000330 20 20 20 20 20 4d 4f 44 45 28 37 29 20 20 20 20 | MODE(7) |
00000340 20 20 20 20 20 20 20 2f 2f 20 74 6f 20 72 65 73 | // to res|
00000350 74 6f 72 65 20 63 75 72 73 6f 72 0d 0a 20 20 20 |tore cursor.. |
00000360 20 20 20 20 20 20 53 54 4f 50 28 30 29 0d 0a 0d | STOP(0)...|
00000370 0a 20 20 20 20 20 20 43 41 53 45 20 27 3d 27 3a |. CASE '=':|
00000380 20 43 41 53 45 20 31 33 3a 20 20 20 2f 2f 20 31 | CASE 13: // 1|
00000390 33 20 69 73 20 52 45 54 55 52 4e 0d 0a 20 20 20 |3 is RETURN.. |
000003a0 20 20 20 20 20 20 43 48 54 59 50 45 20 3a 3d 20 | CHTYPE := |
000003b0 54 2e 45 51 55 41 4c 53 0d 0a 20 20 20 20 20 20 |T.EQUALS.. |
000003c0 20 20 20 45 4e 44 43 41 53 45 0d 0a 0d 0a 20 20 | ENDCASE.... |
000003d0 20 20 20 20 43 41 53 45 20 27 3b 27 3a 20 20 20 | CASE ';': |
000003e0 20 20 20 20 20 20 20 20 20 2f 2f 20 63 6f 6e 76 | // conv|
000003f0 65 72 74 20 27 3b 27 20 74 6f 20 27 2b 27 0d 0a |ert ';' to '+'..|
00000400 20 20 20 20 20 20 20 20 20 43 48 20 3a 3d 20 27 | CH := '|
00000410 2b 27 0d 0a 20 20 20 20 20 20 43 41 53 45 20 27 |+'.. CASE '|
00000420 2b 27 3a 0d 0a 20 20 20 20 20 20 20 20 20 43 48 |+':.. CH|
00000430 54 59 50 45 20 3a 3d 20 54 2e 4f 50 0d 0a 20 20 |TYPE := T.OP.. |
00000440 20 20 20 20 20 20 20 45 4e 44 43 41 53 45 0d 0a | ENDCASE..|
00000450 0d 0a 20 20 20 20 20 20 43 41 53 45 20 27 3a 27 |.. CASE ':'|
00000460 3a 20 20 20 20 20 20 20 20 20 20 20 20 2f 2f 20 |: // |
00000470 63 6f 6e 76 65 72 74 20 27 3a 27 20 74 6f 20 27 |convert ':' to '|
00000480 2a 27 0d 0a 20 20 20 20 20 20 20 20 20 43 48 20 |*'.. CH |
00000490 3a 3d 20 27 2a 2a 27 0d 0a 20 20 20 20 20 20 43 |:= '**'.. C|
000004a0 41 53 45 20 27 2a 2a 27 3a 20 43 41 53 45 20 27 |ASE '**': CASE '|
000004b0 2f 27 3a 0d 0a 20 20 20 20 20 20 20 20 20 43 48 |/':.. CH|
000004c0 54 59 50 45 20 3a 3d 20 54 2e 4f 50 0d 0a 20 20 |TYPE := T.OP.. |
000004d0 20 20 20 20 20 20 20 45 4e 44 43 41 53 45 0d 0a | ENDCASE..|
000004e0 0d 0a 20 20 20 20 20 20 43 41 53 45 20 31 32 37 |.. CASE 127|
000004f0 3a 20 20 20 20 20 20 20 20 20 20 20 20 2f 2f 20 |: // |
00000500 31 32 37 20 69 73 20 64 65 6c 65 74 65 0d 0a 20 |127 is delete.. |
00000510 20 20 20 20 20 20 20 20 43 48 54 59 50 45 20 3a | CHTYPE :|
00000520 3d 20 54 2e 43 4c 45 41 52 0d 0a 20 20 20 20 20 |= T.CLEAR.. |
00000530 20 20 20 20 45 4e 44 43 41 53 45 0d 0a 0d 0a 20 | ENDCASE.... |
00000540 20 20 20 20 20 43 41 53 45 20 27 2d 27 3a 0d 0a | CASE '-':..|
00000550 20 20 20 20 20 20 20 20 20 43 48 54 59 50 45 20 | CHTYPE |
00000560 3a 3d 20 54 2e 4d 49 4e 55 53 0d 0a 20 20 20 20 |:= T.MINUS.. |
00000570 20 20 20 20 20 45 4e 44 43 41 53 45 0d 0a 0d 0a | ENDCASE....|
00000580 20 20 20 20 20 20 43 41 53 45 20 27 30 27 3a 20 | CASE '0': |
00000590 43 41 53 45 20 27 31 27 3a 20 43 41 53 45 20 27 |CASE '1': CASE '|
000005a0 32 27 3a 20 43 41 53 45 20 27 33 27 3a 20 43 41 |2': CASE '3': CA|
000005b0 53 45 20 27 34 27 3a 0d 0a 20 20 20 20 20 20 43 |SE '4':.. C|
000005c0 41 53 45 20 27 35 27 3a 20 43 41 53 45 20 27 36 |ASE '5': CASE '6|
000005d0 27 3a 20 43 41 53 45 20 27 37 27 3a 20 43 41 53 |': CASE '7': CAS|
000005e0 45 20 27 38 27 3a 20 43 41 53 45 20 27 39 27 3a |E '8': CASE '9':|
000005f0 0d 0a 20 20 20 20 20 20 43 41 53 45 20 27 45 27 |.. CASE 'E'|
00000600 3a 20 43 41 53 45 20 27 2e 27 3a 0d 0a 20 20 20 |: CASE '.':.. |
00000610 20 20 20 20 20 20 43 48 54 59 50 45 20 3a 3d 20 | CHTYPE := |
00000620 54 2e 4e 55 4d 43 48 0d 0a 20 20 20 20 20 20 20 |T.NUMCH.. |
00000630 20 20 45 4e 44 43 41 53 45 0d 0a 0d 0a 20 20 20 | ENDCASE.... |
00000640 20 20 20 43 41 53 45 20 46 49 52 53 54 46 4e 3a | CASE FIRSTFN:|
00000650 20 20 20 20 20 20 20 20 2f 2f 20 66 30 20 69 73 | // f0 is|
00000660 20 61 6c 77 61 79 73 20 75 73 65 64 20 74 6f 20 | always used to |
00000670 73 77 61 70 20 66 75 6e 63 74 69 6f 6e 73 0d 0a |swap functions..|
00000680 20 20 20 20 20 20 20 20 20 46 4e 53 45 54 20 3a | FNSET :|
00000690 3d 20 28 46 4e 53 45 54 2b 31 29 20 52 45 4d 20 |= (FNSET+1) REM |
000006a0 28 46 4e 53 45 54 4d 41 58 2b 31 29 0d 0a 20 20 |(FNSETMAX+1).. |
000006b0 20 20 20 20 20 20 20 44 49 53 50 46 4e 53 28 29 | DISPFNS()|
000006c0 20 20 20 20 20 20 20 20 20 2f 2f 20 64 69 73 70 | // disp|
000006d0 6c 61 79 20 6e 65 77 20 66 75 6e 63 74 69 6f 6e |lay new function|
000006e0 73 20 26 20 75 70 64 61 74 65 20 4d 41 58 46 4e |s & update MAXFN|
000006f0 0d 0a 20 20 20 20 20 20 20 20 20 4c 4f 4f 50 20 |.. LOOP |
00000700 20 20 20 20 20 20 20 20 20 20 20 20 20 2f 2f 20 | // |
00000710 62 61 63 6b 20 66 6f 72 20 6e 65 78 74 20 63 68 |back for next ch|
00000720 61 72 61 63 74 65 72 0d 0a 0d 0a 20 20 20 20 20 |aracter.... |
00000730 20 44 45 46 41 55 4c 54 3a 0d 0a 20 20 20 20 20 | DEFAULT:.. |
00000740 20 20 20 20 54 45 53 54 20 46 49 52 53 54 46 4e | TEST FIRSTFN|
00000750 2b 31 20 3c 3d 20 43 48 20 3c 3d 20 4d 41 58 46 |+1 <= CH <= MAXF|
00000760 4e 20 54 48 45 4e 0d 0a 20 20 20 20 20 20 20 20 |N THEN.. |
00000770 20 20 20 20 43 48 54 59 50 45 20 3a 3d 20 49 4e | CHTYPE := IN|
00000780 54 45 52 50 46 4e 28 29 20 2f 2f 20 69 66 20 76 |TERPFN() // if v|
00000790 61 6c 69 64 20 66 75 6e 63 74 69 6f 6e 20 6b 65 |alid function ke|
000007a0 79 20 69 6e 74 65 72 70 72 65 74 20 69 74 0d 0a |y interpret it..|
000007b0 20 20 20 20 20 20 20 20 20 45 4c 53 45 0d 0a 20 | ELSE.. |
000007c0 20 20 20 20 20 20 20 20 20 20 20 4c 4f 4f 50 20 | LOOP |
000007d0 20 20 20 20 20 20 20 20 20 20 2f 2f 20 69 6e 76 | // inv|
000007e0 61 6c 69 64 20 63 68 61 72 61 63 74 65 72 20 2d |alid character -|
000007f0 20 69 67 6e 6f 72 65 20 69 74 0d 0a 20 20 20 24 | ignore it.. $|
00000800 29 0d 0a 20 20 20 52 45 53 55 4c 54 49 53 20 43 |).. RESULTIS C|
00000810 48 54 59 50 45 0d 0a 24 29 20 52 45 50 45 41 54 |HTYPE..$) REPEAT|
00000820 0d 0a 0d 0a 0d 0a 2f 2f 20 47 45 54 4e 55 4d 20 |......// GETNUM |
00000830 69 73 20 63 61 6c 6c 65 64 20 74 6f 20 72 65 61 |is called to rea|
00000840 64 20 61 20 6e 75 6d 62 65 72 2e 20 20 57 68 69 |d a number. Whi|
00000850 6c 65 20 61 20 6e 75 6d 62 65 72 20 69 73 20 62 |le a number is b|
00000860 65 69 6e 67 20 72 65 61 64 20 69 6e 0d 0a 2f 2f |eing read in..//|
00000870 20 69 74 20 69 73 20 64 69 73 70 6c 61 79 65 64 | it is displayed|
00000880 20 61 73 20 74 79 70 65 64 20 28 72 61 74 68 65 | as typed (rathe|
00000890 72 20 74 68 61 6e 20 69 6e 20 61 20 73 74 61 6e |r than in a stan|
000008a0 64 61 72 64 20 66 6f 72 6d 61 74 29 2e 20 20 54 |dard format). T|
000008b0 68 65 0d 0a 2f 2f 20 27 63 6c 65 61 72 27 20 66 |he..// 'clear' f|
000008c0 75 6e 63 74 69 6f 6e 20 69 73 20 68 61 6e 64 6c |unction is handl|
000008d0 65 64 20 65 6e 74 69 72 65 6c 79 20 77 69 74 68 |ed entirely with|
000008e0 69 6e 20 74 68 69 73 20 70 72 6f 63 65 64 75 72 |in this procedur|
000008f0 65 2e 20 20 4f 6e 0d 0a 2f 2f 20 65 6e 74 72 79 |e. On..// entry|
00000900 20 43 48 20 63 6f 6e 74 61 69 6e 73 20 74 68 65 | CH contains the|
00000910 20 66 69 72 73 74 20 63 68 61 72 61 63 74 65 72 | first character|
00000920 20 6f 66 20 74 68 65 20 6e 75 6d 62 65 72 2e 20 | of the number. |
00000930 20 4f 6e 20 65 78 69 74 20 74 68 65 0d 0a 2f 2f | On exit the..//|
00000940 20 6e 65 78 74 20 63 68 61 72 61 63 74 65 72 20 | next character |
00000950 72 65 61 64 20 73 68 6f 75 6c 64 20 62 65 20 74 |read should be t|
00000960 68 65 20 74 65 72 6d 69 6e 61 74 6f 72 20 6f 66 |he terminator of|
00000970 20 74 68 65 20 6e 75 6d 62 65 72 2e 0d 0a 0d 0a | the number.....|
00000980 41 4e 44 20 47 45 54 4e 55 4d 28 4e 55 4d 29 20 |AND GETNUM(NUM) |
00000990 42 45 0d 0a 24 28 20 4c 45 54 20 43 4f 55 4e 54 |BE..$( LET COUNT|
000009a0 20 3d 20 30 20 20 20 20 20 2f 2f 20 6e 75 6d 62 | = 0 // numb|
000009b0 65 72 20 6f 66 20 63 68 61 72 61 63 74 65 72 73 |er of characters|
000009c0 20 72 65 61 64 0d 0a 20 20 20 4c 45 54 20 4e 45 | read.. LET NE|
000009d0 47 2e 56 41 4c 49 44 20 3d 20 53 54 41 54 45 20 |G.VALID = STATE |
000009e0 3d 20 53 2e 4e 55 4d 32 20 26 20 28 4f 50 3d 27 |= S.NUM2 & (OP='|
000009f0 2a 2a 27 20 7c 20 4f 50 3d 27 2f 27 29 0d 0a 20 |**' | OP='/').. |
00000a00 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | |
00000a10 20 20 20 20 2f 2f 20 74 72 75 65 20 69 66 20 6c | // true if l|
00000a20 65 61 64 69 6e 67 20 27 2d 27 20 69 73 20 61 6c |eading '-' is al|
00000a30 6c 6f 77 65 64 20 28 65 2e 67 2e 20 69 6e 0d 0a |lowed (e.g. in..|
00000a40 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | |
00000a50 20 20 20 20 20 2f 2f 20 73 69 74 75 61 74 69 6f | // situatio|
00000a60 6e 73 20 73 75 63 68 20 61 73 20 27 31 32 33 20 |ns such as '123 |
00000a70 2a 20 2d 34 35 36 20 3d 27 0d 0a 20 20 20 4c 45 |* -456 ='.. LE|
00000a80 54 20 4e 55 4d 53 54 52 20 3d 20 56 45 43 20 4e |T NUMSTR = VEC N|
00000a90 55 4d 57 49 44 54 48 2f 32 0d 0a 20 20 20 20 20 |UMWIDTH/2.. |
00000aa0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | |
00000ab0 2f 2f 20 68 6f 6c 64 73 20 74 68 65 20 63 68 61 |// holds the cha|
00000ac0 72 61 63 74 65 72 73 20 74 79 70 65 64 20 69 6e |racters typed in|
00000ad0 20 28 75 70 20 74 6f 20 31 37 29 0d 0a 20 20 20 | (up to 17).. |
00000ae0 4c 45 54 20 4e 55 4d 56 45 43 20 3d 20 56 45 43 |LET NUMVEC = VEC|
00000af0 20 46 50 2e 4c 45 4e 0d 0a 0d 0a 20 20 20 24 28 | FP.LEN.... $(|
00000b00 20 53 57 49 54 43 48 4f 4e 20 43 48 54 59 50 45 | SWITCHON CHTYPE|
00000b10 20 49 4e 54 4f 0d 0a 20 20 20 20 20 20 24 28 0d | INTO.. $(.|
00000b20 0a 20 20 20 20 20 20 20 20 20 2f 2f 20 46 75 6e |. // Fun|
00000b30 63 74 69 6f 6e 20 6c 69 6b 65 20 70 69 20 6f 72 |ction like pi or|
00000b40 20 65 20 2d 20 6f 76 65 72 77 72 69 74 65 20 61 | e - overwrite a|
00000b50 6e 79 20 63 68 61 72 61 63 74 65 72 73 20 65 6e |ny characters en|
00000b60 74 65 72 65 64 0d 0a 20 20 20 20 20 20 20 20 20 |tered.. |
00000b70 2f 2f 20 61 6c 72 65 61 64 79 20 28 62 75 74 20 |// already (but |
00000b80 61 6c 6c 6f 77 20 66 6f 72 20 63 61 73 65 73 20 |allow for cases |
00000b90 6c 69 6b 65 20 27 31 32 33 20 2a 20 2d 70 69 27 |like '123 * -pi'|
00000ba0 29 20 61 6e 64 20 72 65 74 75 72 6e 2e 0d 0a 0d |) and return....|
00000bb0 0a 20 20 20 20 20 20 20 20 20 43 41 53 45 20 54 |. CASE T|
00000bc0 2e 4e 55 4d 4f 50 3a 0d 0a 20 20 20 20 20 20 20 |.NUMOP:.. |
00000bd0 20 20 20 20 20 46 55 4e 43 4f 50 28 4e 55 4d 29 | FUNCOP(NUM)|
00000be0 20 20 20 20 2f 2f 20 67 65 74 20 74 68 65 20 76 | // get the v|
00000bf0 61 6c 75 65 0d 0a 20 20 20 20 20 20 20 20 20 20 |alue.. |
00000c00 20 20 49 46 20 43 4f 55 4e 54 3d 31 20 26 20 4e | IF COUNT=1 & N|
00000c10 55 4d 53 54 52 25 31 20 3d 20 27 2d 27 20 54 48 |UMSTR%1 = '-' TH|
00000c20 45 4e 0d 0a 20 20 20 20 20 20 20 20 20 20 20 20 |EN.. |
00000c30 20 20 20 46 4e 45 47 28 4e 55 4d 2c 20 4e 55 4d | FNEG(NUM, NUM|
00000c40 29 0d 0a 20 20 20 20 20 20 20 20 20 20 20 20 57 |).. W|
00000c50 52 49 54 45 4e 55 4d 28 4e 55 4d 2c 20 30 29 20 |RITENUM(NUM, 0) |
00000c60 20 20 2f 2f 20 64 69 73 70 6c 61 79 20 69 74 0d | // display it.|
00000c70 0a 20 20 20 20 20 20 20 20 20 20 20 20 52 45 54 |. RET|
00000c80 55 52 4e 0d 0a 0d 0a 20 20 20 20 20 20 20 20 20 |URN.... |
00000c90 2f 2f 20 45 66 66 65 63 74 20 6f 66 20 63 6c 65 |// Effect of cle|
00000ca0 61 72 20 64 65 70 65 6e 64 73 20 6f 6e 20 77 68 |ar depends on wh|
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