# convert_error_check.py
#
#   Improved version of convert.py, with error checking.

def celsius_to_fahrenheit(temperature):
    """Returns fahrenheit given celsius.  Assumes input is numeric."""
    return (9.0/5.0)*celsius + 32

def main():
    """Ask user for Celsius temperature, then print Fahreneit conversion."""
    celsius = input("What is the Celsius temperature? ")
    try:
        celsius=float(celsius)
        print "The temperature is ", celsius_to_fahrenheit(celcius),
        print " degrees Fahrenheit."
    except:
        print "Oops - what you typed isn't a number."
        return

main()