F#
let rec loop rev i = if i = 0 then rev else loop (rev * 10 + (i % 10)) (i / 10) // usage, returns 987654321 let reversed = loop 0 123456789
while
i % 10
i
rev * 10
i / 10
I happened to remember these little number tricks from a previous challenge. This is basically using integers as digit stacks.
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F#
whileloop on compile)i % 10gets the right-most digit ofirev * 10shifts the numbers left, with right-most zeroi / 10shifts the numbers right, dropping right-most digitI happened to remember these little number tricks from a previous challenge. This is basically using integers as digit stacks.