CIS 2279 Homework Assignment #06

Due Friday, Oct 10, 2008

• Create a perl script named lab06.pl in your user directory. The script that has the following features:
  
  1. Asks the user to input a temperature in degrees F.
  2. Using a subroutine, check that the temperature is a sane value and prompt the user to reenter the temperature if it is not valid.
  3. Asks the user to input a RH% as an integer.
  4. Check that the RH% is valid (0-100)
  5. Uses a subroutine to return the dew point in degrees F providing the temperature in interval given the temperature(F) and RH%.
  6. Using a subroutine, checks that the calculated dew point is valid
  7. Prints the final low dew point to the screen in Farenheit, Celcius and Kelvin degrees using subroutines to calculate each.

$dewpt = ((1/$temp_k) - (1/5412 * log($rh/100) ))**-1;

Where $temp_k is the temperature in Kelvin degrees and $rh is the relative humidity as an integer (ex. 88.4). You will need to convert the input temperature to Kelvin (temp C + 273.15). The output of the above equation will be in Kelvin degrees so you will need to convert back to F. Creating an additional subroutine for the conversions might not be a bad idea.
• 10% bonus - create a subroutine in the script above that will return the wind chill using the given temperature and wind speed. Print the lowest calculated windchill value to the screen in F, K and C using some descriptive text.

  Wind Chill (F) = 35.74 + 0.6215(T) - 35.75(V0.16) + 0.4275(T)(V0.16)
  Where T = temperature in degrees F and V = wind velocity in MPH.
  Celcius = (TempF - 32)/1.8

last updated: 07 Oct 2008 21:34