#!/usr/bin/python
## a program for doing temperature conversion.

import sys

## convert Fahrenheit to Celsius
def FtoC(F) :
    return (F - 32) * (5.0/9)

## convert Celsius to Fahrenheit
def CtoF(C) :
    return (9/5.0) * C + 32


if __name__ == "__main__" :
    if len(sys.argv) < 3 :
        print "Usage: converter.py {-f | -c} temp"
        sys.exit(0)
    else :
        ### note the % operator being used to provide printf-style formatting
        if (sys.argv[1] == '-f') :
            print '%d degrees Fahrenheit is %d degrees Celsius' % \
                  (int(sys.argv[2]), FtoC(int(sys.argv[2])))
        else :
            print '%d degrees Celsius is %d degrees Fahrenheit' % \
                  (int(sys.argv[2]), CtoF(int(sys.argv[2])))