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Task/Five-weekends/ERRE/five-weekends.erre

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+PROGRAM FIVE_WEEKENDS
+
+DIM M$[12]
+
+PROCEDURE MODULO(X,Y->MD)
+  IF Y=0 THEN
+     MD=X
+   ELSE
+     MD=X-Y*INT(X/Y)
+  END IF
+END PROCEDURE
+
+PROCEDURE WD(M,D,Y->RES%)
+  IF M=1 OR M=2 THEN
+     M+=12
+     Y-=1
+  END IF
+  MODULO(365*Y+INT(Y/4)-INT(Y/100)+INT(Y/400)+D+INT((153*M+8)/5),7->RES)
+  RES%=RES+1.0
+END PROCEDURE
+
+BEGIN
+  M$[]=("","JANUARY","FEBRUARY","MARCH","APRIL","MAY","JUNE","JULY","AUGUST","SEPTEMBER","OCTOBER","NOVEMBER","DECEMBER")
+  PRINT(CHR$(12);) ! CLS
+  FOR YEAR=1900 TO 2100 DO
+       FOREACH MONTH IN (1,3,5,7,8,10,12) DO   ! months with 31 days
+           WD(MONTH,1,YEAR->RES%)
+           IF RES%=6 THEN  ! day #6 is Friday
+              PRINT(YEAR;": ";M$[MONTH])
+              CNT%=CNT%+1
+!             IF CNT% MOD 20=0 THEN GET(K$) END IF  ! press a key for next page
+            END IF
+       END FOR
+  END FOR
+  PRINT("Total =";CNT%)
+END PROGRAM