While loops

While loops take the form:
while condition {
statement
}

var timer = 10
while timer > 0 {
	--timer
}

var beerVolume = 12.0
var sip = 0.3

while beerVolume > 0 {
	print("Cheers!")
	beerVolume -= sip
} 

Repeat-While loop
repeat {
statement
} while condition

repeat {
	--timer
} while timer > 0

repeat {
	print("Cheers")
	beerVolume -= sip
} while beerVolume > 0