Sha256: c0783c727fe6937228db5bad9a583f979a27619f0b211badce48d360bb658087
Contents?: true
Size: 778 Bytes
Versions: 135
Compression:
Stored size: 778 Bytes
Contents
"""Calculate the number of grains on square `square`."""
function on_square(square)
check_square_input(square)
2 ^ (square - 1)
end
"""Calculate the total number of grains after square `square`."""
function total_after(square)
check_square_input(square)
sum(map(on_square, 1:square))
end
"""Validate an arbitrary square."""
function check_square_input(square)
square == 0 && throw(DomainError(square, "Square input of zero is invalid."))
square < 0 && throw(DomainError(square, "Negative square input is invalid."))
square > 64 && throw(DomainError(square, "Square input greater than 64 is invalid."))
end
if VERSION < v"0.7" # backwards compatibility
Base.DomainError(val) = DomainError()
Base.DomainError(val, msg) = DomainError()
end
Version data entries
135 entries across 135 versions & 1 rubygems