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Help with equation

post #1 of 7
Thread Starter 
Needless to say I am failing hardcore at writing an equation that won't compile into errors.

Here is what I am looking for:

A = P (1 + i / q)nq where

q is the number of times per year interest is compounded
n is the number of years
i is the interest rate (written as decimal, not a percent)
P is the principal (original investment)
A is the amount after adding the compound interest earned


As of now here is what I am tried and failed at:

Total := Float (Invest (1 + Interest / Compound) Years * Compound));

Needless to say this failed horribly, and I have test just

Total := Float (Interest * Invest);

Which did give me a correct answer for the problem of $300 so I would assume the rest of my program is fine, but I am multiplying floats and integers, but I don't think that will cause any problems (correct me if I am wrong, but the assignment requires real and whole numbers).
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post #2 of 7
I'm unfamiliar with the language you are using (and you never specified what it was) but you may need to specify products explicitly or the compiler may interpret a function call.

Total := Float (Invest *(1 + Interest / Compound) *Years * Compound));

Also, depending on the language, you may need to explicitly cast all your variables to floats to get it to work as expected.
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post #3 of 7
Thread Starter 
I am using Ada, and I will try what you suggested and report back.
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post #4 of 7
Thread Starter 
I am getting these errors when trying to use that equation:


assign3.adb:75:43: invalid operand types for operator "/"
assign3.adb:75:43: left operand has type "Standard.Float"
assign3.adb:75:43: right operand has type "Standard.Integer"
gnatmake: "assign3.adb" compilation error

And I am not sure that I can make them all into floats (I would in a heartbeat if I could), but on the assignment it states:

Write a top-down design and implement an interactive Ada program that prompts for and reads in

An amount of money invested (a real number)
The interest rate in percent (a real number)
The number of years to invest the money (a whole number)
The number of times per year interest is compounded (a whole number)
The name of the account (contains no more than 20 characters)

Also what does he mean by a top-down design (I assume it is just the .adb (text code of the program).
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post #5 of 7
I'm afraid I can't help any more than that, I could only guess. Hopefully someone with Ada knowledge will come by to help smile.gif
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post #6 of 7
Thread Starter 
he just stated on his website:

The exponent needs to be a Integer (Corrected!) type... That's the crux of the error that others are getting.

But, you can't just have integers, either, as the formula requires taking the interest and dividing it by the compound periods...If your interest is an Integer (say 10%), and your compound periods are monthly (12 per year), then the fraction rate/compound would be 10/12 = 0 (because it's integer division).

So basically, you need floats everywhere except the exponent, which needs to be Integer type.


So I just got rid of the Integers on the years invested and compounds per year because that is what I believe he is asking for (correct me if I am mistaken).

Anyway if it isn't I will just tell him it is what I thought from what he said.

Also your equation worked like a charm for the floats, + rep.
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post #7 of 7
Thread Starter 
I still am happy for your help ARandomOWI, but I was able to force an equation that with integers and floats.

But thanks anyway because I would have went with that if I didn't get this which I really still don't I just did trail and error for the past 20 minutes to get it.
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