CODEWITHSUNDEEP
pythonpython-3.xwhile-loopinfinite-loop
supernal-hades
supernal-hades

Reputation: 33

Control flow python

Actually I am used to c++ and I am stuck in python. I can't seem to understand what's causing the infinite while loop. The main goal of the code is to calculate how many months are required to save enough money for upfront payment.

#*******Initializing all the required variables***********
home_price = float(input("Enter the price of your dream home:")) # cost of the home

down_payment_portion = 0.25 # initial upfront pay for the home which is 25%
stamp_duty_portion = 0.03 # 3%

annual_salary = float(input("Enter your annual salary:"))

tax_portion = 0.2 # 20%
save_amount = 0

save_portion = float(input("Enter the amount of money you want to save after tax-cut:"))

annual_return = 0.05 # 5%
months = 0

#*********************************************************
#------------Calculating all the necessary values---------

down_payment_portion = down_payment_portion * home_price # calculating the down payment for the dream home

stamp_duty_portion = stamp_duty_portion * home_price # calculating the stamp duty for the home

tax_portion = tax_portion * annual_salary # calculating the tax cut

save_portion = save_portion * save_amount # calculating the portion of tax-cut income to be put into savings

annual_return = (save_amount * annual_return) / 12

upfront_payment = down_payment_portion + stamp_duty_portion

while(save_amount < upfront_payment):
   save_amount = save_amount + annual_return
   save_amount = save_amount + (annual_salary - tax_portion) * save_portion / 12
   months = months + 1

print(f'You will need {months} month to save enough for your upfront payment{upfront_payment}.')

Upvotes: 1

Views: 74

Answers (1)

Abhi_J
Abhi_J

Reputation: 2129

  1. You initialise save_amount = 0
  2. you get annual_return as annual_return = (save_amount * annual_return) / 12 which would be zero
  3. you also get save_portion as save_portion = save_portion * save_amount which is again zero
  4. Therefore your save_amount in the while loop is never incremented it too remains zero, save_amount < upfront_payment is always true ==> Infinite loop

In your code

while(save_amount < upfront_payment):
   save_amount = save_amount + annual_return # 0 + 0 = 0

   # 0 + (some value * 0)/12 = 0
   save_amount = save_amount + (annual_salary - tax_portion) * save_portion / 12

Upvotes: 1

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