#!/usr/bin/env python
# -*- coding: utf-8 -*-

# This program is copyright 2016, P. Lutus and is released under the GPL.

import sys

args = sys.argv[1:]

if(len(args) != 4):
  print('Sloped-bottom tank solver')
  print('Usage: values for h x y z')
else:
  try:  
    h,x,y,z = [float(v) for v in args]
    if(h == 0): h = 1e-9
    if(y >= h):
      v = z * ((y-h) * x + h * x / 2)
    else:
      v = z * y * x * y/(2 * h)
    labels = ('h','x','y','z')
    print('Arguments:\n')
    for n,a in enumerate([h,x,y,z]):
      print('  %s: %6.2f' % (labels[n],a))
    print('\nResult volume: %.2f' % v)
  except:
    print("Error: non-numeric entry.")