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Recursive 4-arm match on (a, b) tuples threading a carry: match (a, b) with | ([], []) -> if carry = 0 then [] else [carry] | (x :: xs, []) -> (s mod 10) :: aux xs [] (s / 10) where s = x + carry | ([], y :: ys) -> ... | (x :: xs, y :: ys) -> ... where s = x + y + carry Little-endian digit lists. Three tests: [9;9;9] + [1] = [0;0;0;1] (=1000, digit sum 1) [5;6;7] + [8;9;1] = [3;6;9] (=963, digit sum 18) [9;9;9;9;9;9;9;9] + [1] length 9 (carry propagates 8x) Sum = 1 + 18 + 9 = 28. Exercises tuple-pattern match on nested list-cons with the integer arithmetic and carry-threading idiom typical of multi-precision implementations. 52 baseline programs total.
57 lines
1.1 KiB
JSON
57 lines
1.1 KiB
JSON
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