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Task/Leap-year/FutureBasic/leap-year.futurebasic

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+include "ConsoleWindow"
+
+// In-line C function to generate random number in range
+BeginCFunction
+long randomInRange( long min, long max ) {
+int i = (arc4random()%(max-min+1))+min;
+return (long)i;
+}
+EndC
+toolbox fn randomInRange( long min, long max  ) = long
+
+// Leap year test function
+local fn LeapYear( year as long ) as Boolean
+dim as Boolean result : result = _false
+
+if year mod 400 == 0 then result = _true  : exit fn
+if year mod 100 == 0 then result = _false : exit fn
+if year mod   4 == 0 then result = _true  : exit fn
+if year mod   4 != 0 then result = _false : exit fn
+end fn = result
+
+dim as long i, y, knownLeapYear(10)
+
+// Array of known leap years from 1980 through 2020 for control
+knownLeapYear(0) = 1980 : knownLeapYear(1)  = 1984 : knownLeapYear(2) = 1988
+knownLeapYear(3) = 1992 : knownLeapYear(4)  = 1996 : knownLeapYear(5) = 2000
+knownLeapYear(6) = 2004 : knownLeapYear(7)  = 2008 : knownLeapYear(8) = 2012
+knownLeapYear(9) = 2016 : knownLeapYear(10) = 2020
+
+print "Known leap years:"
+for i = 0 to 9
+   if ( fn LeapYear( knownLeapYear(i) ) == _true )
+   print knownLeapYear(i); " is a leap year."
+else
+   print knownLeapYear(i); " is a not leap year."
+   end if
+next
+
+print
+
+// Random years from 1980 to 2020 to test
+print "Check random years:"
+for i = 0 to 20
+   y = fn randomInRange( 1980, 2020  )
+   if ( fn LeapYear( y ) == _true )
+      print y; " is a leap year."
+   else
+      print y; " is a not leap year."
+   end if
+next