"""
Ex. 4.2 from "A primer on..."
Same as ex 4.1, but read the F degree number
as a command line argument. 
"""

import sys

F = float(sys.argv[1])
C = (F - 32) * 5.0 / 9
print(f'{F} grader F er {C:.2f} grader C')

"""
Terminal> python f2c_cml.py 100
100.0 grader F er 37.78 grader C
"""