atom K = prompt_number("Enter temperature in Kelvin >=0: ",{0,1e307})
printf(1," Kelvin: %5.2f\n Celsius: %5.2f\nFahrenheit: %5.2f\n Rankine: %5.2f\n\n",
{K, K-273.15, K*1.8-459.67, K*1.8})