[Tutor] infinite while loop

[Marcus Lütolf]

Thank you. 
The previousBalance is set back to 1000 after each run oft he for loop intentionally for the
following for loops should run with minimumFixedMonthlyPayment each time increased by 10
til previousBalance get's negative.

The while loop  should then stop, when   previousBalance  gets smaller than 0 but it doesn't.
Might it be a problem of scope ?


-----Ursprüngliche Nachricht-----
Von: Susana <lists at linguarum.net> 
Gesendet: Freitag, 1. Oktober 2021 20:47
An: marcus.luetolf at bluewin.ch
Cc: tutor at python.org
Betreff: Re: [Tutor] infinite while loop

Hi,

"previousBalance" reaches while condition (< 0.0) inside the for loop, but then it is set to the value of "balance" in the line:

previousBalance = balance

So I think that "previousBalance" is always 1000 when the while condition is checked.

Hope this helps.

Cheers,
-- 
Susana Sotelo Docío                                  gpg-id: 0E9BEDA4


marcus.luetolf at bluewin.ch escreveu:
> Hello Experts,
> 
> I'm stuck with not beeig able to stop the while loop in the script 
> below which should
> 
> yield the  minimumFixedMonthlyPayment (in steps of 10) to payoff a 
> balance in 12 months
> 
> according to the variables set.
> 
>  
> 
> The script below creates an indefinite loop and I don't understand why 
> the the loop
> 
> does not stop when the variable "previousBalance > yields negative 
> values despite
> 
> the condition set for the while loop.
> 
> Where is my mistake ?
> 
>  
> 
> >balance = 1000
> 
> >previousBalance = balance
> 
>  
> 
> >minimumFixedMonthlyPayment = 10
> 
> >annualInterestRate = 0.2
> 
> >monthlyInterestRate = (annualInterestRate) / 12.0
> 
>  
> 
> >while previousBalance > 0.0:
> 
>  
> 
>         >for i in range(12):
> 
>             >monthlyPaidBalance = (previousBalance) -
> (minimumFixedMonthlyPayment)
> 
>             >updatedBalanceEachMonth = (monthlyPaidBalance) + 
> (monthlyInterestRate * monthlyPaidBalance)
> 
>             >previousBalance = updatedBalanceEachMonth
> 
>             >print('previousBalance:', round(previousBalance,2))
> 
>             >print('minimumFixedMonthlyPayment:',
> minimumFixedMonthlyPayment)
> 
>         >previousBalance = balance
> 
>         >minimumFixedMonthlyPayment += 10
> 
> >print(previousBalance, minimumFixedMonthlyPayment)
> 
>  
> 
>  
> 
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