# F L O A T I N G   BA R G E 
# Frans Coenen
# University of Liverpool
# 8 March 2013, updated 1 October 2016

# Constants (weight of iron (KG per square meter)
# By convention names for constants are written in uper case
WEIGHT_OF_IRON    = 7.780;
WEIGHT_OF_WATER   = 1.000;
THICKNESS_OF_IRON = 0.010;
    
# Input
print('Input Length, Breadth and Height of iron barge')
length  = float(input('Length:\t'))
breadth = float(input('Bredth:\t'))
height  = float(input('Height:\t'))

# Determine volume of the iron used to build the barge, 
# Remember that the barge has no top.
totalVolume= length*breadth*height
internalVolume = (length-(THICKNESS_OF_IRON*2))*(breadth-(THICKNESS_OF_IRON*2)) * \
                 (height-THICKNESS_OF_IRON)
volume = totalVolume-internalVolume

# Determine mass of barge
mass = volume*WEIGHT_OF_IRON

# Determine draft
draft = mass/(length*breadth*WEIGHT_OF_WATER)

# Output
print("Draft = \t",draft);