Elementary Programming; Exercise No. 15

(Science: wind-chill temperature) How cold is it outside? The temperature alone is not enough to provide the answer. Other factors including wind speed, relative humidity, and sunshine play important roles in determining coldness outside. In 2001, the National Weather Service (NWS) implemented the new windchill
temperature to measure the coldness using temperature and wind speed. The formula is

t_wc = 35.74 + 0.6215t_a - 35.75v^0.16 + 0.4275t_av^0.16

where t a is the outside temperature measured in degrees Fahrenheit and v is the speed measured in miles per hour. t wc is the wind-chill temperature. The formula cannot be used for wind speeds below 2 mph or temperatures below -58ºF or above 41ºF.

Write a program that prompts the user to enter a temperature between -58ºF and 41ºF and a wind speed greater than or equal to  2 and displays the wind-chill temperature.

Solution:

public static void main(String[] args) {

   Scanner s = new Scanner(System.in);

   double temperature, windSpeed, windChill;

   System.out.print("Enter the temperature in Fahrenheit between -58°F and 41°F:");

   temperature = s.nextDouble();

   System.out.print("Enter the wind speed (>=2) in miles per hour:");

   windSpeed = s.nextDouble();

   windChill = 35.74 + 0.6215 * temperature - 35.75 * Math.pow(windSpeed, 0.16) + 0.4275 * temperature * Math.pow(windSpeed, 0.16);

   System.out.print("The wind chill index is " + windChill);

}