# Examples of some methods with no return type, or with no parameters

def main():
   result = getALetter();	# no parameters, but returns a str
   printQuotient(9, 5);		# no return function.  call by itself
   printQuotient(5, 0);
   print "Before killSomeTime() is called"
   killSomeTime();
   print "After killSomeTime() is called"

def getALetter():
   
   isLetter = False;
   let =''
   while(not isLetter):
      let = raw_input("Please enter a letter of the alphabet: ")
      isLetter = (let >= 'A' and let <= 'Z') or (let >= 'a' and let <= 'z');

   if not isLetter:
      print "Not a letter.  Try again.\n"

   return let;

def printQuotient(x, y):
   if y == 0:
      print "I'm not going to divide by 0 !"
      return 
   print "The quotient of ", x, \
         " divided by ", y, " is: ", (x / y) 

def killSomeTime():
   # this function is going to just delay a little
   x = 0
   while x < 5000000000:
      x+=1
      if x%100000000 == 0:
         print x/5000000000.0*100.0,"% complete."
      
main()