def main():
"""The main function. Used to test the other functions."""
cb_at_10m = c.cb_extrapolation(0.75, 7.3, 10.0)
print("Estimated block coefficient at 10.0 m: {0:.3f}\n".format(cb_at_10m))
fr = c.fineness_ratio(160.0, 34000.0)
print("Fineness ratio for a vessel with lwl = 160.0 m and displacement of 34000 tons: {0:.2f}".
format(fr))
fr = c.fineness_ratio(0.97*68.3, 4800.0)
print("Fineness ratio for a vessel with lwl = 66.2 m and displacement of 4800 tons: {0:.2f}".
format(fr))
def test_cb_extrapolation_downwards(self):
"""Unit test for block coefficient extrapolation, extrapolating upwards"""
self.assertAlmostEqual(c.cb_extrapolation(0.80, 10.0, 7.3), 0.778, 3)