Question

Problem Wk.2.3.1:
1. a1
2. b2
3. c1

Answer 1

Problem Wk2.3.2:
class AccountDollars:
def __init__(self,value):
self.balance = value
def depositDollars(self,deposit):
self.interestFees()
self.balance = self.balance + deposit
return self.balance
def interestFees(self):
self.balance = self.balance * 1.1
self.balance = self.balance - 0.5

class AccountPounds(AccountDollars):
def __init__(self,pounds):
self.balance = 2*pounds
def depositPounds(self,deposit):
self.interestFees()
self.balance = self.balance + deposit*2
return self.balance/2.0

Answer 2

Problem Wk.2.3.3:

import lib601.sm as sm

class CountMod5(CountingStateMachine):
def getCurOutput(self,state,inp):
#print "state", state
return state%5

class CountingStateMachine(sm.SM):
def __init__(self):
self.startState = 0
def getCurOutput():
pass
def getNextValues(self,state,inp):
output = self.getCurOutput(state,inp)
#print "out :", output
return (state + 1, output)

print "test", CountMod5().transduce([0,1,2,3,4,5,6,7,8,9,10],verbose=True)

Answer 3

Problem Wk.2.3.4
def add(a, b):
if b == 0:
return a
else:
return add(a, b-1) + 1

# False - a and b can be any number
# False - a can be any number, b must be integer
# False -
# True -
# False
# False
# True
# True
# False

# add(5,1)
# add(5,0)
# None

def sub(a,b):
if b == 0:
return a
else:
return sub(a, b-1) - 1

Answer 4

# Problem Wk.2.3.5

def slowMod(a, b):
if a < b:
return a
else:
return slowMod(a - b, b)