anonymous
  • anonymous
I'm having issues with my code for PS2 question 2 it saying that there's an error on my else statement.
MIT 6.00 Intro Computer Science (OCW)
  • Stacey Warren - Expert brainly.com
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katieb
  • katieb
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anonymous
  • anonymous
balance=4213 annualInterestRate=.2 factor=0 #How much paid total x=0 #Lowest payment variable y=0 #Range for one year of paying minimum 12 months in a year while balance >= 0: factor+=1 for n in range(1,13): x=str(factor)*(10*str(n)) balance=(balance-(10*str(factor)))*(1+(annualInterestRate/12) else: y=str(factor)*10 #Print Lowest Payment print('Lowest Payment: '+str(round(y,-1)))
anonymous
  • anonymous
You're getting an "invalid syntax" error?
anonymous
  • anonymous
yes would like to know whats the reason before i procede on fixing the rest of the code

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anonymous
  • anonymous
Looks like you're missing a parenthesis on this line: balance=(balance-(10*str(factor)))*(1+(annualInterestRate/12)
anonymous
  • anonymous
That looks to be the first problem, it's expecting a ")" to close (1+(annualInterestRate/12)
anonymous
  • anonymous
On this line: " x=str(factor)*(10*str(n)) " You are trying to obtain a number, correct? the "str(x)" method converts the argument into a string.
anonymous
  • anonymous
Yeah, close the parenthesis, then run the code. You should encounter another error...
anonymous
  • anonymous
Always the small things that gets me, thanks. Also for that section of code I am aiming at getting a number value is str() not the function? Another issue i seem to see is that shouldn't i have a void loop on the calculation of balance part because if the first time the payment isn't right and i go to check the next factor of 10 the balance will be altered do to previous run.
anonymous
  • anonymous
Yea got the TypeError: can't multiply sequence by non-int of type 'str' Will change that part and others like that asap.
anonymous
  • anonymous
Yeah, you're working with numbers. Checkout here: http://docs.python.org/library/string.html
anonymous
  • anonymous
There you can see methods/functions for string in python. str(x) converts the argument x to a string
anonymous
  • anonymous
How's it going?
anonymous
  • anonymous
For str() i would need to convert to int because the error it shows now is TypeError: can't multiply sequence by non-int of type 'str' since working in which month and factors of ten i can change that into int() right?
anonymous
  • anonymous
yeah, basically you can't multiply strings together...
anonymous
  • anonymous
factor is already a number luckily
anonymous
  • anonymous
You shouldn't need to have anything as a string to begin with. I think you are making it more complicated than it is. just leave everything as numbers. you don't even have to convert to str to print it.
anonymous
  • anonymous
I deleted all str() and still have an error at where i have my "else:" statement error is invalid syntax
anonymous
  • anonymous
hm, did you put in that parenthesis at the end?
anonymous
  • anonymous
You are trying to do a while ... else .... there is no such thing, just while or if..else
anonymous
  • anonymous
Can you direct to me the assignment via link?
anonymous
  • anonymous
But, @msmithhnova is right, your current solution may be more complicated than necessary and hence combining programing designs. if : .. else: clauses exists in python. a while: ... else: block does not exist.
anonymous
  • anonymous
you have to be logged in to view assignment i can send the summary of it though I change my "while" to "if" and still has same error at same location im double checking all my parenthesis
anonymous
  • anonymous
Paste your current code here please, that'll help
anonymous
  • anonymous
balance=4213 annualInterestRate=.2 factor=0 #How much paid total x=0 #Lowest payment variable y=0 if balance > 0: factor+=1 #Range for one year of paying minimum 12 months in a year for n in range(1,13): x=factor*(10*n) balance=(balance-(10*factor)*(1+(annualInterestRate/12)) else: y=factor*10 #Print Lowest Payment print('Lowest Payment: '+str(round(y,-1)))
anonymous
  • anonymous
cool
anonymous
  • anonymous
Yep, missing a parenthesis: balance=(balance-(10*factor)*(1+(annualInterestRate/12)) <---- ) need
anonymous
  • anonymous
Here's some pseudocode that might help set payment guess loop check guess if guess not right increase guess end loop
anonymous
  • anonymous
Yupp that did the trick thank you dpflan :) now time to fix the algebra part msmithhnova will that pseudo code fix the issue with balance being overwritten to a new value when increasing the guess.
anonymous
  • anonymous
No, you will want to create a new variable equal to balance to either work with or keep track of original amoiunt.
anonymous
  • anonymous
Another note is from the pseudocode you are looking at one while loop with everything in it. The only thing that would end up outside the loop is the print statement with your final answer.
anonymous
  • anonymous
An issue with your code above also is that your guess (x) should be changed outside the for as the for loop is the 'check' part of the pseudocode
anonymous
  • anonymous
Try to state the goal of the problem, from there, write out your solution in pseudocode, and create the mathematical relationship among variables
anonymous
  • anonymous
BTW, dpflan, the basics of the problem is make guesses in increments of 10 that it will take to pay off balance in 1 year including interest. Once a guess makes the balance less than 0 you're done.
anonymous
  • anonymous
Never thought about doing a pseudo code seems like an easier cleaner route ill try that and let you know what other issues i run into. Thanks for the all the help so far.
anonymous
  • anonymous
The goal is to find the factor such that the balance becomes 0 within 12 iterations
anonymous
  • anonymous
You need to start each examination with balance at the starting balance.
anonymous
  • anonymous
A simple debugging technique is add print statements in your code, for instance it might help to print the values you are working with, like the balance and the factor
anonymous
  • anonymous
that makes life so much easier thank you i seem to getting some numbers displayed printed out hopefully they are the right numbers.
anonymous
  • anonymous
If not lets us know. Pseudocode is a wonderful thing it allows you to think about the logic and coding seperately instead of doing both at the same time. Once you think you have your logic (pseudocode) figured out then it is just a matter of turning that into actual code. When you do, you sometimes realize your logic (pseudocode) was a little off of your translation to code was and one or both have to be modified. This is where the print statements help immensely to show you where the flaw is.
anonymous
  • anonymous
Yeah, feel free to share your solution when reach one. We can check out your code like we've just done and give you some help. What course is this from? An MIT OCW course, the MOOC course,...?
anonymous
  • anonymous
Edx MIT 600 course
anonymous
  • anonymous
so far this is what i have in my code, added a few things to make up for the override my answer is 140 but i should be getting 310 with the current balance and interest rate i put in i will need to look more into pseudo code is there any site that teaches the concept well?
anonymous
  • anonymous
one thing that helped answer is i deleted "-x" in my while statement but im still $30 off
anonymous
  • anonymous
balance=3329 annualInterestRate=.2 factor=0 #How much paid total x=0 #Lowest payment variable y=0 balance1=balance while balance1 >= 0: factor+=1 x=0 balance1=balance #Range for one year of paying minimum 12 months in a year for n in range(1,13): print('What Factor im on:'+str(factor)) print('Which month im on:'+str(n)) x=factor*10*n print(str(x)) balance1=(balance1-(10*factor)*(1+(annualInterestRate/12))) print('Balance so far:'+str(balance1)) amiclose=balance1-x #print(str(amiclose)) y=factor*10 #Print Lowest Payment print('Lowest Payment:'+str(y)) #actual Lowest payment should be 310
anonymous
  • anonymous
Just headed home, will take a look when I get there if someone else hasn't by then.
TuringTest
  • TuringTest
you have a lot of extra variables...
anonymous
  • anonymous
in my new code i use those variables to check where im at and print out values if you d like i can update the code i noted what each variable does
TuringTest
  • TuringTest
x=factor*10*n this line is strange, why should the minimum payment be proportional to which number month of the year you are in?
anonymous
  • anonymous
that line states how much have i paid off the debt in which factor and this given month so i could check my math
anonymous
  • anonymous
aleluja i was missing a ')' and since it was following mathematical rules PEMDAS it didnt work out at first now everything seems good :) thanks all for the help
TuringTest
  • TuringTest
ok, still, n is the number month you are in this code is saying that you pay factor*10*2 in february, and factor810*3 in march i.e. you pay more in march then february, how does that make sense?
anonymous
  • anonymous
the thing is how much total have i paid up to that month you know
TuringTest
  • TuringTest
it makes sense that the total you have paid my march is more than in february, but you code says that you pay more for *that* particular month than the one before
TuringTest
  • TuringTest
I mean, if you get the right answer then okay, but I don't see how...
anonymous
  • anonymous
hmmm im not understanding your question their but i did submit my code and it was right thanks guys :)
TuringTest
  • TuringTest
okey dokey then :)
anonymous
  • anonymous
Glad you got it to work.
anonymous
  • anonymous
What is wrong with this code: balance = 4213 annualInterestRate = 0.2 monthlyPaymentRate = 0.4 month = 1 balance = (balance - (balance*monthlyPaymentRate))*(1+(annualInterestRate/12)) while month < 13: print "Month: " + str(month) print "Minimum monthly payment: " + str(round(minimum_payment_rate, 2)) print "Remaining balance: " + str(round(balance, 2)) month += 1
anonymous
  • anonymous
where do you calculate your balance in the loop? It will remain the same. You just incrementing the month and you don't touch the min payment or the balance!

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