var scale = Hash(
    Celcius    => Hash.new(factor => 1  , offset => -273.15 ),
    Rankine    => Hash.new(factor => 1.8, offset =>    0    ),
    Fahrenheit => Hash.new(factor => 1.8, offset => -459.67 ),
);

var kelvin = Sys.readln("Enter a temperature in Kelvin: ").to_n;
kelvin >= 0 || die "No such temperature!";

scale.keys.sort.each { |key|
    printf("%12s:%8.2f\n", key, kelvin*scale{key}{:factor} + scale{key}{:offset});
}