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decus_20tap1_198111
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decus/20-0020/calend.dem
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100' NAME--CALENDAR
110'
120' DESCRIPTION--DETERMINES THE DAY OF THE WEEK ON WHICH A
130' GIVEN DATE FALLS.
140'
150' SOURCE--UNKNOWN
160'
170' INSTRUCTIONS--TYPE "RUN" AND FOLLOW INSTRUCTIONS.
180'
190'
200' * * * * * * * MAIN PROGRAM * * * * * * * * *
210'
220 PRINT "THIS PROGRAM DETERMINES THE DAY OF THE WEEK"
230 PRINT "ON WHICH A GIVEN DATE FALLS."
240 DIM F(12), L(12)
250 MAT READ F
260 DATA 0, 3, 3, 6, 1, 4, 6, 2, 5, 0, 3, 5
270 MAT READ L
280 DATA 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
290 GOTO 960
300 IF Y < 1 THEN 470
310 IF M > 12 THEN 470
320 IF M < 1 THEN 470
330 IF D < 1 THEN 470
340 IF Y > 1752 THEN 540
350 IF Y < 1582 THEN 490
360 IF Y = 1752 THEN 430
370 IF Y = 1582 THEN 390
380 GO TO 510
390 IF M < 10 THEN 490
400 IF M > 10 THEN 510
410 IF D < 15 THEN 490
420 GO TO 510
430 IF M < 9 THEN 510
440 IF M > 9 THEN 540
450 IF D < 14 THEN 510
460 GO TO 540
470 PRINT "UNACCEPTABLE DATA -- TRY AGAIN."
480 GOTO 970
490 LET G1 = 0
500 GO TO 520
510 LET G1 = 1
520 LET J1 = 1
530 GO TO 560
540 LET G1 = 1
550 LET J1 = 0
560 IF J1 <> 1 THEN 740
570 LET L1 = 0
580 LET A = Y + INT((Y+3)/4)
590 IF Y <> INT(Y/4)*4 THEN 640
600 LET L1 = 1
610 IF M < 3 THEN 640
620 LET L = 1
630 GO TO 650
640 LET L = 0
650 LET Z = A + D + L + F(M) + 5
660 LET Z = Z - INT(Z/7)*7
670 LET Q = L(M)
680 IF M <> 2 THEN 700
690 LET Q = Q + L1
700 IF D > Q THEN 470
710 PRINT "OLD STYLE CALENDAR: ";
720 LET W=1
730 GOSUB 1110
740 IF G1<>1 THEN 970
750 LET L1 = 0
760 LET Y = Y - 400*INT(Y/400)
770 LET A = Y + INT((Y+3)/4) - INT((Y-1)/100)
780 IF Y <> INT(Y/4)*4 THEN 850
790 IF Y = 0 THEN 810
800 IF Y = 100*INT(Y/100) THEN 850
810 LET L1 = 1
820 IF M < 3 THEN 850
830 LET L = 1
840 GO TO 860
850 LET L =0
860 LET Z = A + D + L + F(M)
870 LET Z = Z - INT(Z/7)*7
880 LET Q = L(M)
890 IF M <> 2 THEN 910
900 LET Q = Q + L1
910 IF D > Q THEN 470
920 IF W=0 THEN 940
930 PRINT "NEW STYLE CALENDAR: ";
940 GOSUB 1110
950 GOTO 970
960 PRINT "ENTER MONTH NUMBER, DATE, AND YEAR."
970 PRINT
980 IF W1=0 THEN 1060
990 PRINT "IS THERE ANOTHER DATE YOU WANT TO KNOW";
1000 MAT INPUT A$
1010 IF A$(1)="NO" THEN 1260
1020 IF A$(1)="YES" THEN 1050
1030 PRINT "INCORRECT ANSWER. PLEASE TYPE 'YES' OR 'NO'."
1040 GOTO 1000
1050 PRINT
1060 PRINT "ENTER DATE: ";
1070 LET W=0
1080 LET W1=1
1090 INPUT M, D, Y
1100 GO TO 300
1110 ON Z+1 THEN 1120,1140,1160,1180,1200,1220,1240
1120 PRINT "FRIDAY"
1130 RETURN
1140 PRINT "SATURDAY"
1150 RETURN
1160 PRINT "SUNDAY"
1170 RETURN
1180 PRINT "MONDAY"
1190 RETURN
1200 PRINT "TUESDAY"
1210 RETURN
1220 PRINT "WEDNESDAY"
1230 RETURN
1240 PRINT "THURSDAY"
1250 RETURN
1260 END