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(F:\\LPT\\COMPR\\APP_A.DOC)(EWvA, MRK)(February 26, 1993)fileinfo
%%EndProlog
%%Page: 0 1
delay mfeed
begpage
12 FAB
880 3176 m
(Appendix A:  Palindrome filter)s
12 FB
293 2969 m
(In)s
352(this)ms
442(appendix)ms
644(we)ms
720(illustrate)ms
913(the)ms
992(CLiP)ms
1116(style)ms
1228(of)ms
1288(literate)ms
1445(programming)ms
1735(by)ms
1803(a)ms
1843(program)ms
2030(to)ms
2087(filter)ms
12 FB
293 2909 m
(palindromic)s
551(lines)ms
662(from)ms
775(an)ms
839(input)ms
958(file.)ms
1054(Three)ms
1187(files)ms
1290(are)ms
1367(involved:)ms
1573(the)ms
1650(program)ms
1836(module)ms
2003(\()ms
11 FH
(PALIN-)s
11 FH
293 2849 m
(DROME.PAS)s
12 FB
(\),)s
582(a)ms
616(test)ms
698(file)ms
778(\()ms
11 FH
(TESTDATA.TXT)s
12 FB
(\))s
1154(and)ms
1238(a)ms
1273(command)ms
1483(file)ms
1562(\()ms
11 FH
(PALINDROME.COM)s
12 FB
(\))s
1993(to)ms
2044(run)ms
2123(the)ms
293 2789 m
(palindrome)s
533(filter.)ms
393 2729 m
(Subsections)s
646(A.1)ms
735(through)ms
905(A.7)ms
993(display)ms
1153(the)ms
1229(documentation)ms
1541(literally,)ms
1723(but)ms
1802(we)ms
1875(have)ms
1984(numbered)ms
293 2669 m
(the)s
366(code)ms
473(lines)ms
580(in)ms
631(the)ms
705(margin)ms
859(for)ms
930(easy)ms
1031(reference)ms
1230(from)ms
1339(the)ms
1413(main)ms
1526(text.)ms
12 FAB
293 2546 m
(A.1.  Specification)s
12 FB
293 2459 m
(A)s
341(palindrome)ms
581(is)ms
627(a)ms
661(sentence)ms
846(with)ms
947(the)ms
1020(property)ms
1202(that)ms
1289(the)ms
1363(letters)ms
1497(from)ms
1607(left)ms
1686(to)ms
1737(right,)ms
1856(read)ms
1954(the)ms
2028(same)ms
2143(as)ms
293 2399 m
(from)s
410(right)ms
525(to)ms
585(left.)ms
685(In)ms
747(the)ms
828(comparison)ms
1082(uppercase)ms
1303(and)ms
1396(lowercase)ms
1616(letters)ms
1759(are)ms
1841(considered)ms
2078(to)ms
2137(be)ms
293 2339 m
(equivalent)s
510(and)ms
591(all)ms
650(other)ms
762(characters)ms
973(are)ms
1043(simply)ms
1189(ignored.)ms
1363(Hence)ms
1499(an)ms
1556(empty)ms
1690(sentence)ms
1871(is)ms
1913(a)ms
1944(palindrome.)ms
293 2279 m
(Other)s
419(examples)ms
620(are:)ms
8 FB
226 2198 m
(1)s
10 FH
368 2198 m
(\(*************  #file "TESTDATA.TXT"  #comment off  *************\))s
8 FB
226 2156 m
(2)s
10 FH
368 2156 m
(Ada)s
8 FB
226 2115 m
(3)s
10 FH
368 2115 m
(1234567)s
8 FB
226 2073 m
(4)s
10 FH
368 2073 m
(Able was I, ere I saw Elba.)s
8 FB
226 2031 m
(5)s
10 FH
368 2031 m
(A man, a plan, a canal, Panama.)s
8 FB
226 1990 m
(6)s
10 FH
368 1990 m
(Norma is as selfless as I Am, Ron.)s
8 FB
226 1948 m
(7)s
10 FH
368 1948 m
(\(*****************  End of TESTDATA.PAS  ************************\))s
12 FB
293 1856 m
(The)s
384(program)ms
11 FH
567(PALINDROME)ms
12 FB
856(reads)ms
975(an)ms
1036(input)ms
1152(file,)ms
1245(filters)ms
1375(the)ms
1450(lines)ms
1558(that)ms
1647(are)ms
1721(palindromic)ms
1976(and)ms
2062(writes)ms
293 1796 m
(them)s
405(to)ms
456(an)ms
516(output)ms
656(file.)ms
12 FAB
293 1672 m
(A.2.  Communication with the outside world)s
12 FB
293 1586 m
(The)s
389(program)ms
576(conforms)ms
784(to)ms
841(the)ms
921(general)ms
1086(template)ms
1277(of)ms
1337(a)ms
1377(Pascal)ms
1524(program.)ms
1724(We)ms
1812(introduce)ms
2019(the)ms
2098(files)ms
11 FH
293 1526 m
(IN_FILE)s
12 FB
499(and)ms
11 FH
585(OUT_FILE)ms
12 FB
818(to)ms
871(define)ms
1010(its)ms
1071(communication)ms
1395(with)ms
1498(the)ms
1573(outside)ms
1731(world.)ms
1874(The)ms
1965(actual)ms
2098(files)ms
293 1466 m
(have)s
399(to)ms
451(be)ms
511(specified)ms
704(at)ms
752(run-time.)ms
949(Thus)ms
1062(we)ms
1133(have)ms
8 FB
226 1385 m
(8)s
10 FH
368 1385 m
(\(*****************  #file "PALINDROME.PAS"  *********************\))s
8 FB
226 1343 m
(9)s
10 FH
368 1343 m
(\(****************************************************************\))s
8 FB
209 1301 m
(10)s
10 FH
368 1301 m
(\(* Program: Palindrome filter program.                          *\))s
8 FB
209 1260 m
(11)s
10 FH
368 1260 m
(\(* Purpose: To filter the palindromic lines from a given input  *\))s
8 FB
209 1218 m
(12)s
10 FH
368 1218 m
(\(*          file to a specified output file.                    *\))s
8 FB
209 1176 m
(13)s
10 FH
368 1176 m
(\(****************************************************************\))s
8 FB
209 1135 m
(14)s
10 FH
368 1135 m
(PROGRAM PALINDROME \(INPUT, OUTPUT, IN_FILE, OUT_FILE\);)s
8 FB
209 1093 m
(15)s
209 1051 m
(16)s
10 FH
368 1051 m
(\(*******    Palindrome constants  #multiple #comment off  *******\))s
8 FB
209 1010 m
(17)s
10 FH
368 1010 m
(\(*******    Palindrome types      #multiple #comment off  *******\))s
8 FB
209 968 m
(18)s
10 FH
368 968 m
(VAR)s
8 FB
209 926 m
(19)s
10 FH
368 926 m
(    IN_FILE, OUT_FILE: TEXT;)s
8 FB
209 885 m
(20)s
10 FH
368 885 m
(\(*******    Palindrome variables  #multiple #comment off  *******\))s
8 FB
209 843 m
(21)s
209 801 m
(22)s
10 FH
368 801 m
(BEGIN)s
8 FB
209 760 m
(23)s
10 FH
368 760 m
(    RESET   \(IN_FILE\);)s
8 FB
209 718 m
(24)s
10 FH
368 718 m
(    REWRITE \(OUT_FILE\);)s
8 FB
209 676 m
(25)s
209 635 m
(26)s
10 FH
368 635 m
(    \(*****************  Palindrome \(body\)  **********************\))s
8 FB
209 593 m
(27)s
10 FH
368 593 m
(    \(** Copy the lines of the IN_FILE that are palindromic to  **\))s
8 FB
209 551 m
(28)s
10 FH
368 551 m
(    \(** the OUT_FILE.                                          **\))s
8 FB
209 510 m
(29)s
10 FH
368 510 m
(    \(************************************************************\))s
8 FB
209 468 m
(30)s
209 426 m
(31)s
10 FH
368 426 m
(END \(*PALINDROME*\).)s
8 FB
209 385 m
(32)s
10 FH
368 385 m
(\(*******************  End of PALINDROME.PAS  ********************\))s
8 FB
293 204 m
(The)s
353(CLiP)ms
431(Style)ms
508(of)ms
544(Literate)ms
656(Programming)ms
848(\(3.076,)ms
951(26-feb-93\))ms
12 FB
2075 204 m
( 1 )s
50 2 2130 216 li
50 2 2020 216 li
endpage
%%Page: 1 2
delay mfeed
begpage
12 FB
293 3179 m
(To)s
361(prepare)ms
523(the)ms
597(module)ms
759(for)ms
830(future)ms
962(declarations)ms
1216(of)ms
1270(constants)ms
1469(and)ms
1553(types)ms
1671(we)ms
1742(have)ms
8 FB
209 3098 m
(33)s
10 FH
368 3098 m
(\(*******        Palindrome constants      #leader #quick  *******\))s
8 FB
209 3056 m
(34)s
10 FH
368 3056 m
(CONST)s
8 FB
209 3015 m
(35)s
10 FH
368 3015 m
(\(*******        Palindrome types          #leader #quick  *******\))s
8 FB
209 2973 m
(36)s
10 FH
368 2973 m
(TYPE)s
12 FAB
293 2861 m
(A.3.  Processing of the files)s
12 FB
293 2774 m
(The)s
382(program)ms
563(processes)ms
11 FH
766(IN_FILE)ms
12 FB
970(line)ms
1057(by)ms
1119(line.)ms
1218(The)ms
1307(idea)ms
1402(is)ms
1447(to)ms
1498(buffer)ms
1632(an)ms
1691(exact)ms
1808(copy)ms
1917(of)ms
1970(the)ms
2043(current)ms
293 2714 m
(line)s
380(in)ms
11 FH
432(IN_LINE)ms
12 FB
(,)s
650(while)ms
774(at)ms
823(the)ms
897(same)ms
1013(time)ms
1115(its)ms
1175(letters)ms
1310(are)ms
1384(buffered)ms
1566(in)ms
11 FH
1618(LETTERS)ms
12 FB
(.)s
1836(So)ms
11 FH
1901(LETTERS)ms
12 FB
2107(will)ms
293 2654 m
(be)s
351(empty)ms
487(if)ms
529(the)ms
601(line)ms
687(holds)ms
807(no)ms
868(letters)ms
1002(at)ms
1049(all,)ms
1123(in)ms
1173(which)ms
1306(case)ms
1403(the)ms
1476(line)ms
1562(is)ms
1607(considered)ms
1834(to)ms
1884(be)ms
1943(palindromic)ms
293 2594 m
(by)s
355(definition.)ms
393 2534 m
(We)s
473(choose)ms
622(the)ms
694(buffers)ms
11 FH
847(IN_LINE)ms
12 FB
1050(and)ms
11 FH
1133(LETTERS)ms
12 FB
1336(to)ms
1386(be)ms
1444(of)ms
1497(the)ms
1568(same)ms
1682(type,)ms
11 FH
1791(TEXT_LINE)ms
12 FB
(,)s
2062(which)ms
293 2474 m
(we)s
363(will)ms
454(not)ms
530(specify)ms
687(in)ms
738(detail)ms
862(right)ms
969(now.)ms
1080(For)ms
1162(this)ms
1247(purpose)ms
1417(we)ms
1488(introduce)ms
1690(a)ms
1724(type)ms
11 FH
1823(ABSTRACT)ms
12 FB
(.)s
8 FB
209 2393 m
(37)s
10 FH
368 2393 m
(\(*******        Palindrome types                  #quick  *******\))s
8 FB
209 2351 m
(38)s
10 FH
368 2351 m
(    ABSTRACT  = \(DEFINED, UNDEFINED\);)s
11 FH
293 2259 m
(TEXT_LINE)s
12 FB
553(will)ms
644(temporarily)ms
890(be)ms
951(declared)ms
11 FH
1133(ABSTRACT)ms
12 FB
1366(and)ms
1452(its)ms
1512(details)ms
1656(will)ms
1747(be)ms
1807(defined)ms
1970(later.)ms
2085(Thus)ms
293 2199 m
(the)s
366(declaration)ms
601(of)ms
11 FH
655(TEXT_LINE)ms
8 FB
209 2118 m
(39)s
10 FH
368 2118 m
(\(*******                Palindrome types                  *******\))s
8 FB
209 2076 m
(40)s
10 FH
368 2076 m
(\(*******            Declaration of TEXT_LINE              *******\))s
8 FB
209 2035 m
(41)s
10 FH
368 2035 m
(\(*****************  End of Palindrome types  ********************\))s
12 FB
293 1942 m
(is)s
338(temporarily)ms
584(satisfied)ms
763(with)ms
865(the)ms
938(type)ms
11 FH
1037(ABSTRACT)ms
12 FB
(.)s
8 FB
209 1861 m
(42)s
10 FH
368 1861 m
(\(*******    Declaration of TEXT_LINE     #quick #default  *******\))s
8 FB
209 1820 m
(43)s
10 FH
368 1820 m
(    TEXT_LINE = ABSTRACT;)s
12 FB
293 1727 m
(The)s
383(declaration)ms
617(for)ms
688(the)ms
762(variables)ms
11 FH
955(IN_LINE)ms
12 FB
1160(and)ms
11 FH
1245(LETTERS)ms
12 FB
1450(becomes)ms
8 FB
209 1646 m
(44)s
10 FH
368 1646 m
(\(*******    Palindrome variables                  #quick  *******\))s
8 FB
209 1605 m
(45)s
10 FH
368 1605 m
(    IN_LINE,)s
8 FB
209 1563 m
(46)s
10 FH
368 1563 m
(    LETTERS:        TEXT_LINE;)s
12 FB
293 1471 m
(We)s
377(have)ms
486(to)ms
540(test)ms
11 FH
625(LETTERS)ms
12 FB
832(in)ms
886(order)ms
1007(to)ms
1061(decide)ms
1206(whether)ms
1382(or)ms
1439(not)ms
11 FH
1518(IN_LINE)ms
12 FB
1725(contains)ms
1907(a)ms
1944(palindrome.)ms
293 1411 m
(The)s
383(result)ms
506(of)ms
561(this)ms
645(test)ms
727(is)ms
773(flagged)ms
936(by)ms
11 FH
998(IS_PALINDROME)ms
12 FB
(,)s
1381(for)ms
1451(which)ms
1586(we)ms
1657(introduce)ms
1858(the)ms
1932(declaration)ms
8 FB
209 1330 m
(47)s
10 FH
368 1330 m
(\(*******    Palindrome variables                  #quick  *******\))s
8 FB
209 1288 m
(48)s
10 FH
368 1288 m
(    IS_PALINDROME:  BOOLEAN;)s
12 FB
293 1196 m
(Now)s
402(the)ms
476(body)ms
588(of)ms
642(the)ms
716(Palindrome)ms
959(filter)ms
1069(may)ms
1167(be)ms
1227(expanded)ms
1431(as)ms
8 FB
209 1115 m
(49)s
10 FH
368 1115 m
(    \(*****************  Palindrome \(body\)  **********************\))s
8 FB
209 1073 m
(50)s
10 FH
368 1073 m
(    \(** Copy the lines of the IN_FILE that are palindromic to  **\))s
8 FB
209 1031 m
(51)s
10 FH
368 1031 m
(    \(** the OUT_FILE.                                          **\))s
8 FB
209 990 m
(52)s
10 FH
368 990 m
(    WHILE NOT EOF \(IN_FILE\) DO)s
8 FB
209 948 m
(53)s
10 FH
368 948 m
(    BEGIN)s
8 FB
209 906 m
(54)s
10 FH
368 906 m
(        \(*****************  Palindrome \(1\)  *********************\))s
8 FB
209 865 m
(55)s
10 FH
368 865 m
(        \(** Read a line from IN_FILE into IN_LINE. The letters **\))s
8 FB
209 823 m
(56)s
10 FH
368 823 m
(        \(** of this line are copied to LETTERS.                **\))s
8 FB
209 781 m
(57)s
10 FH
368 781 m
(        \(********************************************************\))s
8 FB
209 740 m
(58)s
209 698 m
(59)s
10 FH
368 698 m
(        READLN \(IN_FILE\);)s
8 FB
209 656 m
(60)s
209 615 m
(61)s
10 FH
368 615 m
(        \(*****************  Palindrome \(2\)  *********************\))s
8 FB
209 573 m
(62)s
10 FH
368 573 m
(        \(** Test palindromicity of LETTERS. Set IS_PALINDROME  **\))s
8 FB
209 531 m
(63)s
10 FH
368 531 m
(        \(** to reflect the result of the test.                 **\))s
8 FB
209 490 m
(64)s
10 FH
368 490 m
(        \(********************************************************\))s
8 FB
209 448 m
(65)s
293 204 m
(The)s
353(CLiP)ms
431(Style)ms
508(of)ms
544(Literate)ms
656(Programming)ms
848(\(3.076,)ms
951(26-feb-93\))ms
12 FB
2075 204 m
( 2 )s
50 2 2130 216 li
50 2 2020 216 li
endpage
%%Page: 2 3
delay mfeed
begpage
8 FB
209 3188 m
(66)s
10 FH
368 3188 m
(        IF IS_PALINDROME THEN)s
8 FB
209 3146 m
(67)s
10 FH
368 3146 m
(        BEGIN)s
8 FB
209 3105 m
(68)s
10 FH
368 3105 m
(            \(*****************  Palindrome \(3\)  *****************\))s
8 FB
209 3063 m
(69)s
10 FH
368 3063 m
(            \(** Write IN_LINE to OUT_FILE.                     **\))s
8 FB
209 3021 m
(70)s
10 FH
368 3021 m
(            \(****************************************************\))s
8 FB
209 2980 m
(71)s
209 2938 m
(72)s
10 FH
368 2938 m
(            WRITELN \(OUT_FILE\);)s
8 FB
209 2896 m
(73)s
10 FH
368 2896 m
(        END \(*IF*\);)s
8 FB
209 2855 m
(74)s
10 FH
368 2855 m
(    END \(*WHILE*\);)s
8 FB
209 2813 m
(75)s
10 FH
368 2813 m
(    \(*************  End of Palindrome \(body\)  *******************\))s
12 FAB
293 2701 m
(A.4.  Choosing the structure of )s
11 FH
(IN_LINE)s
12 FAB
( and )s
11 FH
(LETTERS)s
12 FB
293 2614 m
(Before)s
440(we)ms
510(can)ms
591(proceed)ms
761(we)ms
831(need)ms
937(to)ms
988(establish)ms
1175(a)ms
1209(structure)ms
1395(for)ms
1465(the)ms
1538(objects)ms
11 FH
1691(IN_LINE)ms
12 FB
1896(and)ms
11 FH
1980(LETTERS)ms
12 FB
(.)s
293 2554 m
(Thus)s
410(we)ms
486(define)ms
11 FH
628(TEXT_LINE)ms
12 FB
893(as)ms
952(a)ms
991(structure)ms
1184(with)ms
1290(two)ms
1382(components.)ms
1654(The)ms
1749(first)ms
1847(component)ms
2087(is)ms
2137(an)ms
293 2494 m
(array,)s
11 FH
422(CHARS)ms
12 FB
(,)s
587(which)ms
724(contains)ms
906(the)ms
982(characters)ms
1199(to)ms
1253(be)ms
1315(buffered.)ms
1511(The)ms
1604(second)ms
1758(component,)ms
11 FH
2007(LENGTH)ms
12 FB
(,)s
293 2434 m
(indicates)s
483(which)ms
617(part)ms
707(of)ms
761(the)ms
834(array)ms
949(is)ms
995(actually)ms
1165(occupied.)ms
1371(The)ms
1461(maximum)ms
1676(number)ms
1841(of)ms
1895(characters)ms
2110(that)ms
293 2374 m
(can)s
373(be)ms
432(buffered)ms
613(by)ms
674(the)ms
747(structure)ms
933(is)ms
978(determined)ms
1214(by)ms
1276(the)ms
1348(length,)ms
11 FH
1497(MAX_L)ms
12 FB
(,)s
1659(of)ms
1712(the)ms
1784(array.)ms
11 FH
1911(MAX_L)ms
12 FB
2060(serves)ms
293 2314 m
(as)s
347(an)ms
406(implementation)ms
733(parameter.)ms
8 FB
209 2233 m
(76)s
10 FH
368 2233 m
(\(*******    Palindrome constants                  #quick  *******\))s
8 FB
209 2191 m
(77)s
10 FH
368 2191 m
(    MAX_L = 132;)s
8 FB
209 2150 m
(78)s
209 2108 m
(79)s
10 FH
368 2108 m
(\(*******        Declaration of TEXT_LINE          #quick  *******\))s
8 FB
209 2066 m
(80)s
10 FH
368 2066 m
(    TEXT_LINE =     RECORD)s
8 FB
209 2025 m
(81)s
10 FH
368 2025 m
(                        CHARS: ARRAY[1..MAX_L] OF CHAR;)s
8 FB
209 1983 m
(82)s
10 FH
368 1983 m
(                        LENGTH: 0..MAX_L;)s
8 FB
209 1941 m
(83)s
10 FH
368 1941 m
(                    END \(*RECORD*\);)s
12 FAB
293 1829 m
(A.5.  Reading a line)s
12 FB
293 1742 m
(For)s
381(efficiency)ms
599(reasons)ms
768(we)ms
845(fill)ms
11 FH
922(IN_LINE)ms
12 FB
1133(and)ms
11 FH
1224(LETTERS)ms
12 FB
1435(simultaneously.)ms
1769(Therefore)ms
1985(we)ms
2062(buffer)ms
293 1682 m
(every)s
416(character)ms
612(that)ms
699(is)ms
745(read)ms
844(from)ms
11 FH
953(IN_FILE)ms
12 FB
1158(in)ms
1210(the)ms
1283(variable)ms
11 FH
1457(IN_CHAR)ms
12 FB
(.)s
8 FB
209 1601 m
(84)s
10 FH
368 1601 m
(\(*******    Palindrome variables                  #quick  *******\))s
8 FB
209 1560 m
(85)s
10 FH
368 1560 m
(    IN_CHAR:    CHAR;)s
12 FB
293 1467 m
(Only)s
402(when)ms
11 FH
520(IN_CHAR)ms
12 FB
723(turns)ms
832(out)ms
906(to)ms
955(be)ms
1011(a)ms
1043(letter)ms
1156(it)ms
1193(is)ms
1237(copied)ms
1380(to)ms
11 FH
1428(LETTERS)ms
12 FB
(.)s
1643(Since)ms
1764(this)ms
1846(process)ms
2005(is)ms
2049(crucial)ms
293 1407 m
(for)s
363(the)ms
437(overall)ms
588(operation,)ms
802(we)ms
873(make)ms
994(provisions)ms
1215(for)ms
1285(some)ms
1403(debugging)ms
1627(code)ms
1734(here.)ms
8 FB
209 1326 m
(86)s
10 FH
368 1326 m
(        \(*****************  Palindrome \(1\)  *********************\))s
8 FB
209 1285 m
(87)s
10 FH
368 1285 m
(        \(** Read a line from IN_FILE into IN_LINE. The letters **\))s
8 FB
209 1243 m
(88)s
10 FH
368 1243 m
(        \(** of this line are copied to LETTERS.                **\))s
8 FB
209 1201 m
(89)s
10 FH
368 1201 m
(        IN_LINE.LENGTH := 0;)s
8 FB
209 1160 m
(90)s
10 FH
368 1160 m
(        LETTERS.LENGTH := 0;)s
8 FB
209 1118 m
(91)s
10 FH
368 1118 m
(        WITH IN_LINE DO)s
8 FB
209 1076 m
(92)s
10 FH
368 1076 m
(        WHILE NOT EOLN \(IN_FILE\) DO)s
8 FB
209 1035 m
(93)s
10 FH
368 1035 m
(        BEGIN)s
8 FB
209 993 m
(94)s
10 FH
368 993 m
(            READ \(IN_FILE, IN_CHAR\);)s
8 FB
209 951 m
(95)s
10 FH
368 951 m
(            LENGTH := LENGTH + 1;)s
8 FB
209 910 m
(96)s
10 FH
368 910 m
(            CHARS[LENGTH] := IN_CHAR;)s
8 FB
209 868 m
(97)s
10 FH
368 868 m
(            IF IN_CHAR IN ['A'..'Z', 'a'..'z'] THEN)s
8 FB
209 826 m
(98)s
10 FH
368 826 m
(            WITH LETTERS DO)s
8 FB
209 785 m
(99)s
10 FH
368 785 m
(            BEGIN)s
8 FB
193 743 m
(100)s
10 FH
368 743 m
(                LENGTH := LENGTH + 1;)s
8 FB
193 701 m
(101)s
10 FH
368 701 m
(                CHARS[LENGTH] := IN_CHAR;)s
8 FB
193 660 m
(102)s
10 FH
368 660 m
(            END \(*WITH/IF*\);)s
8 FB
193 618 m
(103)s
10 FH
368 618 m
(        END \(*WHILE/WITH*\);)s
8 FB
193 576 m
(104)s
193 535 m
(105)s
10 FH
368 535 m
(        \(*********************  Palindrome \(test\)  **************\))s
8 FB
193 493 m
(106)s
10 FH
368 493 m
(        \(** Check contents of IN_LINE and LETTERS.  #optional  **\))s
8 FB
193 451 m
(107)s
10 FH
368 451 m
(        \(********************************************************\))s
8 FB
193 410 m
(108)s
193 368 m
(109)s
10 FH
368 368 m
(        \(*****************  End of Palindrome \(1\)  **************\))s
8 FB
293 204 m
(The)s
353(CLiP)ms
431(Style)ms
508(of)ms
544(Literate)ms
656(Programming)ms
848(\(3.076,)ms
951(26-feb-93\))ms
12 FB
2075 204 m
( 3 )s
50 2 2130 216 li
50 2 2020 216 li
endpage
%%Page: 3 4
delay mfeed
begpage
12 FAB
293 3176 m
(A.6.  Testing for palindromicity)s
12 FB
293 3089 m
(We)s
385(test)ms
478(the)ms
562(palindromicity)ms
879(of)ms
11 FH
944(LETTERS)ms
12 FB
1160(in)ms
1222(two)ms
1320(steps.)ms
1455(First)ms
1570(we)ms
1651(transform)ms
1869(the)ms
1953(contents)ms
2143(of)ms
11 FH
293 3029 m
(LETTERS)s
12 FB
501(to)ms
556(uppercase)ms
773(and)ms
861(then)ms
963(we)ms
1038(compare)ms
1226(the)ms
1304(characters)ms
1523(of)ms
11 FH
1581(LETTERS)ms
12 FB
1789(pairwise.)ms
1988(The)ms
2082(com-)ms
293 2969 m
(parison)s
453(is)ms
500(done)ms
611(starting)ms
774(with)ms
876(the)ms
951(most)ms
1062(outside)ms
1219(characters)ms
1436(and)ms
1521(progressing)ms
1768(inward.)ms
1933(The)ms
2024(string)ms
2151(is)ms
293 2909 m
(assumed)s
478(a)ms
514(palindrome)ms
756(until)ms
861(the)ms
936(opposite)ms
1119(is)ms
1166(proven)ms
1318(through)ms
1487(a)ms
1523(pair)ms
1615(of)ms
1670(different)ms
1856(characters.)ms
2084(With)ms
293 2849 m
(the)s
366(local)ms
476(counter)ms
8 FB
193 2768 m
(110)s
10 FH
368 2768 m
(\(*******    Palindrome variables                  #quick  *******\))s
8 FB
193 2726 m
(111)s
10 FH
368 2726 m
(    I:        INTEGER;)s
12 FB
293 2634 m
(we)s
363(keep)ms
470(track)ms
583(of)ms
637(the)ms
710(comparing)ms
937(process.)ms
1112(Now)ms
11 FH
1221(Palindrome \(2\))ms
12 FB
1619(can)ms
1701(be)ms
1761(expanded)ms
1965(as)ms
8 FB
193 2553 m
(112)s
10 FH
368 2553 m
(        \(*****************  Palindrome \(2\)  *********************\))s
8 FB
193 2511 m
(113)s
10 FH
368 2511 m
(        \(** Test palindromicity of LETTERS. Set IS_PALINDROME  **\))s
8 FB
193 2470 m
(114)s
10 FH
368 2470 m
(        \(** to reflect the result of the test.                 **\))s
8 FB
193 2428 m
(115)s
10 FH
368 2428 m
(        WITH LETTERS DO)s
8 FB
193 2386 m
(116)s
10 FH
368 2386 m
(        BEGIN)s
8 FB
193 2345 m
(117)s
10 FH
368 2345 m
(            \(* Transform lowercase to uppercase.                *\))s
8 FB
193 2303 m
(118)s
10 FH
368 2303 m
(            FOR I := 1 TO LENGTH DO)s
8 FB
193 2261 m
(119)s
10 FH
368 2261 m
(            IF CHARS[I] IN ['a'..'z'])s
8 FB
193 2220 m
(120)s
10 FH
368 2220 m
(            THEN CHARS[I] :=)s
8 FB
193 2178 m
(121)s
10 FH
368 2178 m
(                 CHR\(ORD\(CHARS[I]\) - ORD\('a'\) + ORD\('A'\)\);)s
8 FB
193 2136 m
(122)s
193 2095 m
(123)s
10 FH
368 2095 m
(            \(* Perform the palindromicity test.                 *\))s
8 FB
193 2053 m
(124)s
10 FH
368 2053 m
(            IS_PALINDROME := TRUE;)s
8 FB
193 2011 m
(125)s
10 FH
368 2011 m
(            I := 1;)s
8 FB
193 1970 m
(126)s
10 FH
368 1970 m
(            WHILE IS_PALINDROME AND \(I <= LENGTH DIV 2\) DO)s
8 FB
193 1928 m
(127)s
10 FH
368 1928 m
(            IF CHARS[I] = CHARS[LENGTH-I+1] THEN)s
8 FB
193 1886 m
(128)s
10 FH
368 1886 m
(                I := I + 1)s
8 FB
193 1845 m
(129)s
10 FH
368 1845 m
(            ELSE)s
8 FB
193 1803 m
(130)s
10 FH
368 1803 m
(                IS_PALINDROME := FALSE;)s
8 FB
193 1761 m
(131)s
10 FH
368 1761 m
(        END \(*WITH*\);)s
8 FB
193 1720 m
(132)s
10 FH
368 1720 m
(        \(*****************  End of Palindrome \(2\)  **************\))s
12 FAB
293 1607 m
(A.7.  Writing the palindrome)s
12 FB
293 1521 m
(The)s
383(only)ms
484(remaining)ms
699(action)ms
834(is)ms
880(to)ms
931(write)ms
1047(the)ms
1120(contents)ms
1299(of)ms
11 FH
1354(IN_LINE)ms
12 FB
(.)s
1571(Again)ms
1706(we)ms
1777(need)ms
1883(a)ms
1918(local)ms
2028(counter)ms
8 FB
193 1440 m
(133)s
10 FH
368 1440 m
(\(*******    Palindrome variables                  #quick  *******\))s
8 FB
193 1398 m
(134)s
10 FH
368 1398 m
(    J:        INTEGER;)s
12 FB
293 1306 m
(The)s
383(writing)ms
540(proceeds)ms
730(straight)ms
892(forward.)ms
8 FB
193 1225 m
(135)s
10 FH
368 1225 m
(            \(*****************  Palindrome \(3\)  *****************\))s
8 FB
193 1183 m
(136)s
10 FH
368 1183 m
(            \(** Write IN_LINE to OUT_FILE.                     **\))s
8 FB
193 1141 m
(137)s
10 FH
368 1141 m
(            WITH IN_LINE DO)s
8 FB
193 1100 m
(138)s
10 FH
368 1100 m
(            BEGIN)s
8 FB
193 1058 m
(139)s
10 FH
368 1058 m
(                FOR J := 1 TO LENGTH DO)s
8 FB
193 1016 m
(140)s
10 FH
368 1016 m
(                    WRITE \(OUT_FILE, CHARS[J]\);)s
8 FB
193 975 m
(141)s
10 FH
368 975 m
(            END \(*WITH*\);)s
8 FB
193 933 m
(142)s
10 FH
368 933 m
(            \(*************  End of Palindrome \(3\)  **************\))s
12 FAB
293 821 m
(A.8.  Running the Palindrome filter)s
12 FB
293 734 m
(To)s
365(run)ms
449(the)ms
527(program)ms
713(in)ms
769(a)ms
808(VAX/VMS)ms
1055(environment)ms
1325(the)ms
1403(following)ms
1614(command)ms
1829(procedure)ms
2045(is)ms
2096(con-)ms
293 674 m
(venient.)s
8 FB
193 593 m
(143)s
10 FH
368 593 m
(\(*********  #file "PALINDROME.COM"  #comment off  ***************\))s
8 FB
193 551 m
(144)s
10 FH
368 551 m
($!***************************************************************!)s
8 FB
193 510 m
(145)s
10 FH
368 510 m
($! Run PALINDROME. Input file and output file are parameters.   *!)s
8 FB
193 468 m
(146)s
10 FH
368 468 m
($! Par1: Specification of input file.                           *!)s
8 FB
193 426 m
(147)s
10 FH
368 426 m
($! Par2: Specification of output file.                          *!)s
8 FB
193 385 m
(148)s
10 FH
368 385 m
($!***************************************************************!)s
8 FB
293 204 m
(The)s
353(CLiP)ms
431(Style)ms
508(of)ms
544(Literate)ms
656(Programming)ms
848(\(3.076,)ms
951(26-feb-93\))ms
12 FB
2075 204 m
( 4 )s
50 2 2130 216 li
50 2 2020 216 li
endpage
%%Page: 4 5
delay mfeed
begpage
8 FB
193 3188 m
(149)s
10 FH
368 3188 m
($DEFINE IN_FILE  'P1)s
8 FB
193 3146 m
(150)s
10 FH
368 3146 m
($DEFINE OUT_FILE 'P2)s
8 FB
193 3105 m
(151)s
10 FH
368 3105 m
(RUN PALIND)s
8 FB
193 3063 m
(152)s
10 FH
368 3063 m
(\(*****************  End of PALINDROME.COM  **********************\))s
8 FB
293 204 m
(The)s
353(CLiP)ms
431(Style)ms
508(of)ms
544(Literate)ms
656(Programming)ms
848(\(3.076,)ms
951(26-feb-93\))ms
12 FB
2075 204 m
( 5 )s
50 2 2130 216 li
50 2 2020 216 li
endpage
%%Trailer
enddocument
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