Checking for digits in an integer in Julia #Julia #numbers #algorithm

check.jl

# See https://youtu.be/ZYzlhp-W0a8
function digitsin(digits::Integer, number)
    # Decimal representation of `digits` has N digits
    base = 10
    while (digits ÷ base > 0)
        # `digits ÷ base` is same as `floor(Int, digits/base)`
        base *= 10
    end
    # `base` is now the first integer power of 10 above `digits`, used to pick last N digits from `number`
    while number > 0
        if (number % base) == digits  # Last N digits in `number` == digits
            return true
        end
        number ÷= 10  # Remove the last digit from `number`
    end
    return false
end
if !digitsin(9, integer)
    # Do somthing
end