Add corresponding coefficients, treating missing coefficients as zero:
function Add(a, b: number): number
    L := max(len(a), len(b))
    new(result, L)
    for i := 0 to L-1 do
        result[i] := 0
        if i < len(a) then result[i] := result[i] + a[i]
        if i < len(b) then result[i] := result[i] + b[i]
    Normal(result)
    return result
By the digit-array integer representation, the raw result has value . Carry normalization of a digit array produces a normalized result, including any final carry. Both input arrays remain unchanged, so the operation also works when a and b alias each other.

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