编辑代码

//20190401031杨小可
var isWeekend : Bool = false

if isWeekend {
    print ("Today may be Saturday or Sunday.")
} else {
    print ("Today is not Saturday or Sunday.")
}

var sunnyDay = true

if sunnyDay {
    print ("It's sunny.")
} else {
    print ("It's rainy or cloudy.")
}