C++, Help needed! I need a Program that does this: http://screencast.com/t/BFLvrQUh5b Apparently there is something wrong with my code but I don't know why! The behaviour is not correct.

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C++, Help needed! I need a Program that does this: http://screencast.com/t/BFLvrQUh5b Apparently there is something wrong with my code but I don't know why! The behaviour is not correct.

Computer Science
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#include using namespace std; int main() { int InitialValue,NumberOfYears,counter=9,counter2=1,counter3=1,ValueAfterAYear; cout << "Give me the initial value : "; cin >> InitialValue; cout << "Give me the number of the years of that car : "; cin >> NumberOfYears; ValueAfterAYear = InitialValue-InitialValue*30/100; if (NumberOfYears <= 8) { while (counter3 <= NumberOfYears) ValueAfterAYear = ValueAfterAYear-ValueAfterAYear*10/100; counter3++; } if (NumberOfYears > 8) { while (counter2 <= 8) { ValueAfterAYear = ValueAfterAYear-ValueAfterAYear*10/100; counter2++; } while (counter < NumberOfYears) { ValueAfterAYear = ValueAfterAYear-ValueAfterAYear*5/100; NumberOfYears--; } } if (ValueAfterAYear < 500) ValueAfterAYear = 500; cout << "The value of the car is " << ValueAfterAYear; return 0; }
I'll open up Visual Studio in a minute, just tell me exactly what you want to the program to do. I'm assuming you're getting a logic error since you say "The behaviour is not correct".
Yes right, I am getting a logic error. My code's syntax is 100% correct. I don't want you to do me the program. If it's possible just tell me where it lacks logic so that I can learn to make better

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* * * The program has to do this: http://screencast.com/t/BFLvrQUh5b
Look here: while (counter3 <= NumberOfYears) ValueAfterAYear = ValueAfterAYear-ValueAfterAYear*10/100; counter3++; It's an infinite loop. Remember that if you don't include {} only the FIRST line is included in the loop. Wrap it in {}.
Oh right! Hold on lemme check!
okay
Ok now runs and it gives me results. for example this: Give me the initial value : 5000 Give me the number of the years of that car : 5 The value of the car is 2068 But with the calculator it gives me 2551.5
Are you using an IDE, like Visual Studio, or a CLI compiler like gpp/g++? Just wondering since debugging things like this is easy with breakpoints, etc
hm I am using Xcode (Mac application)
Alright, well I haven't used that, but just for future reference learning how to use breakpoints will really help things :) Anyway: I'll check the logic of your program, sec
I also have Visual Studio 2010 and Visual Studio 2012 I can run the code on those programs too on Virtual Machine
check the answer of the equation: Initial value: 5000 years: 5 5000 - 5000 * 30/100 = 3500 3500 - 3500 * 10/100 = 3150 3150 - 3150 * 10/100 = 2835 2835 - 2835 * 10/100 = 2551.5 (2552) That accounts for 5 years Your program IS, in fact, actually getting that result consider the value of counter 3, and how many times it's looping
I hope that's a good hint for you
Really? For you it gets this result? Look here: http://screencast.com/t/3uQDOhBe This is the result from me
You're changing the value from 5000 to 3500 BEFORE the loop; so: First iteration: 3150 Second iteration: 2835 ###Third iteration: 2552 ### Fourth iteration: 2297
also, you'll notice that it proves the wrong results consistently except for the third iteration in this case
i'm 90% sure i know why that is, let me just check
ok
Actually, it's fine
??
Think of this
Initial value: 5000 years: 5 5000 - 5000 * 30/100 = 3500 3500 - 3500 * 10/100 = 3150 3150 - 3150 * 10/100 = 2835 2835 - 2835 * 10/100 = 2551.5 (2552)
and then this
You're changing the value from 5000 to 3500 BEFORE the loop; so: First iteration: 3150 Second iteration: 2835 ###Third iteration: 2552 ### Fourth iteration: 2297
Do you see the problem?
You're looping through 5 times even though a) the first year (5000) is taken care of, and the second year (removing 30%) is taken care of
ooh
see the problem?
I removed that "="
well consider how many years have already passed when the while loop starts
i would advise setting your counter to start at that
thanks dude
counter3=2, and while (counter3 < NumberOfYears) fixes your problem
Yea I did this and the first part is completely done
so it's all fixed? :)
Hey something last, Would it be possible to tell me how to make use of those "breakpoints" in Visual Studio?
sure
Ok Should I open 2010 or 2012 ??
2010
ok
http://i.imgur.com/BMAdkTm.png see that red dot the arrow points to?
yes
That's a breakpoint. By putting that there, it tells the program to pause execution at that point.
You can then press F10 to step through the program, line by line, or F5 to continue until the next breakpoint
the value of this is it lets you see the values stored in your variables when the program isn't finished yet
so you can see the use of this when it comes to debugging. For example, I figured out your problem by putting a breakpoint inside the while loop, and checking the value of valueAfterAYear every iteration.
So put a breakpoint next to ValueAfterAYear = ValueAfterAYear-ValueAfterAYear*10/100; (You can do this by clicking on the gray bar on the far left)
lemme know when you're put a breakpoint there :)
Ok done! Now F10??
have you started the program in debug mode, and entered your values (5000, and 5) in this case?
yes done!
http://i.imgur.com/uoHs6hZ.png look at where ive highlighted in a red box
do you see something similar to this?
yea there is the same exact box on me too
k put your mouse over ValueAfterAYear in the code
when you do that it should come up with "3500", you can do that with any variable within the scope when you're debugging
try it with other variables too
ooh I see!! very useful!!
ok press F10
you'll notice the error jump down a line
and ValueAfterAYear has now changed to 3150
you can look at it from either the box or from mouseovering it
I noticed the 3150 but what do you mean by an error??
sorry i mean arrow***
the arrow on the left
aaah yea there is one
ok, keep pressing F10 until you're back at where we are now
it's 2835 now
if you want to skip going line by line, you can just pres F5 and it will go to the next breakpoint (since were in a loop it goes back to the same breakpoint)
you can also set breakpoints while your code is running
and if you want, double click the value of ValueAfterAYear in the auto's box, you can actually change the value if you want
things like this are so useful when trying to fix a logic problem
but if I change the value will the code change too, so that it corresponds to the changed value?
the actual code itself doesn't change, but within the program itself, the value changes, so it executes as per your changed value
you don't change the value mid program much, it's just a useful thing to know in case you ever need to do that
oh I see
think you understand breakpoints now?
Yea I will use them a lot with nested loops and such! You have no idea how this helps !! :)
haha np
glad i could help

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