Show value domain given scale and reference value and width of field in bits

show_domain.py

#!/usr/bin/env python

"""Show range and precision of encodable values."""

import argparse

parser = argparse.ArgumentParser(description=__doc__)
parser.add_argument("scale", help="Scale value", type=int)
parser.add_argument("reference", help="Reference value", type=int)
parser.add_argument("width", help="Width in bits", type=int)

args = parser.parse_args()

max_val = (2**args.width - args.reference) * 10**-args.scale

print "Minimum value: " + str(args.reference)
print "Maximum value: " + str(max_val)