Ruby, because Ruby has built-in divmod, because you need both at least as often as you need either.
divmod
def piecewise_add(n1, n2) return n1+n2 if n1*n2 == 0 d1, m1 = n1.divmod(10) d2, m2 = n2.divmod(10) m3 = m1+m2 mult = m3 > 9 ? 100 : 10 mult*piecewise_add(d1, d2)+m3 end
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Ruby, because Ruby has built-in
divmod, because you need both at least as often as you need either.