anonymous
  • anonymous
Hi folks, absolute beginner here trying out problem set 1. I've got the code for obtaining the basic information, and the code for the 4 relevant equations, but I can't figure out how to write the code to get the balance after month 1 to become the starting balance for month 2, etc.... can anybody help me with this?
MIT 6.00 Intro Computer Science (OCW)
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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rsmith6559
  • rsmith6559
Probably, without seeing any code, just assign the balance after month 1 to whatever variable was the starting balance for month 1 and let it run.
anonymous
  • anonymous
use a loop, modify the balance variable in the loop, on the next iteration (month) it will be the balance for the next month
anonymous
  • anonymous
Thanks for the replies! I thought I tried to create a loop with the following code, but it just gives me the same values I get for Month 1 for months2-12. Any clue where I go wrong? Code: #Gets initial values for credit variables from user input bal = float(raw_input('Enter the outstanding balance on your credit card: ')) apr = float(raw_input('Enter the annual interest rate as a decimal: ')) mpr = float(raw_input('Enter the minimum monthly payment rate as a decimal: ')) #Basic equations that use input values to return the new balance minpay = mpr*bal intpaid = apr/12 *bal prinpaid = minpay - intpaid newbalance = bal - prinpaid m = 1 for m in range(1,13): print 'Month: ', m print 'Minimum monthly payment: ', minpay print 'Principle paid: ', prinpaid print 'Remaining balance: ', newbalance bal = newbalance

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anonymous
  • anonymous
That last bit should read, bal = newbalance, flush under the last print command...
anonymous
  • anonymous
please use a code pasting site: - http://dpaste.com - http://pastebin.com - http://www.repl.it/ - http://pastie.org - http://codepad.org - http://ideone.com paste your code there and post the link here. select Python syntax highlighting when u paste.
anonymous
  • anonymous
Oh ok, sorry about that!
anonymous
  • anonymous
in your loop, what kind of statements are you executing? Are there any statements in the loop that modify bal or newbalance?
anonymous
  • anonymous
when you think about this problem, what happens over and over again each month?
anonymous
  • anonymous
all of the equations are calculated each month (save for 2), because they all involve a quantity that is changing from month to month--the balance. But I thought that if I wrote bal = newbalance, the next time it runs the loop for month two, it should give me the write result, since the bal for month 2 will now be factored into the variables I ask it to output, if that makes sense.
anonymous
  • anonymous
... i don't see any calculations in the for loop, just print statements
anonymous
  • anonymous
Ok, so if put the calculations in the loop and THEN put bal=newbalance, that will solve my problem?
anonymous
  • anonymous
Thanks for taking the time to reply, btw...
anonymous
  • anonymous
the calcs need to be in the loop. does mpr change every month or is it constant? "... THEN put bal=newbalance, ... " you could just use bal = bal - prinpaid
anonymous
  • anonymous
mpr is constant... yeah, since i just started this stuff yesterday, i keep wanting to create a new variable every time that variable changes... i forget that bal = bal - prinpaid is a possibility
anonymous
  • anonymous
Thanks so much for your help... i think I can get it to work with the info you gave me!
anonymous
  • anonymous
Yay! it worked...
anonymous
  • anonymous
If you're still here, how do I get python to show the return values with two and only decimal places (it's a float return)?
anonymous
  • anonymous
http://docs.python.org/2.7/library/functions.html#round

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