RosettaCodeData/Task/Leap-year/QBasic/leap-year.basic

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DECLARE FUNCTION diy% (y AS INTEGER)
DECLARE FUNCTION isLeapYear% (yr AS INTEGER)
DECLARE FUNCTION year% (date AS STRING)
PRINT isLeapYear(year(DATE$))
FUNCTION diy% (y AS INTEGER)
IF y MOD 4 THEN
diy = 365
ELSEIF y MOD 100 THEN
diy = 366
ELSEIF y MOD 400 THEN
diy = 365
ELSE
diy = 366
END IF
END FUNCTION
FUNCTION isLeapYear% (yr AS INTEGER)
isLeapYear = (366 = diy(yr))
END FUNCTION
FUNCTION year% (date AS STRING)
year% = VAL(RIGHT$(date, 4))
END FUNCTION