TI-84：使用程序与主屏幕时相同的公式、相同的输入、不同的答案
我想在 TI-Basic 中编写一个简单的公式来计算 TI-84 计算器的复利。复利的公式为A = P(1+(r/n))^(n)(t)，其中p是本金，r 是利率（以小数表示），n 是本金复利的次数，t 是时间量，>a 是您添加利息后的最终金额。
当我设置变量（见下文）并在计算器主屏幕上准确输入公式时，我得到$7332.86，这是正确的答案。
但是，当我设置变量并以程序形式输入公式时（见下文），我得到 $42684.69，这是不正确的。
我已经在 2 个不同的 TI-84 计算器上尝试过这个程序，并且得到了相同的结果，所以这不是我的计算器的问题。
老实说，我很困惑。我不知道为什么会发生这种情况，所以如果你擅长数学，知道如何编写 ti 系列计算器，或者只是看到我遗漏的错误，请告诉我，因为这件事一直让我发疯！
具有相同输入和公式的程序，但给出的答案与在主屏幕上使用时不同：
: 2000 -> P
: 0.065 -> R
: 54 -> N
: 20 -> T
: P(1+(R/N))^(N)(T) -> A
: Disp A
I wanted to write a simple formula in TI-Basic to calculate compound interest for my TI-84 calculator. The formula for compound interest is A = P(1+(r/n))^(n)(t) where p is the principal amount, r is the interest rate (expressed as a decimal), n is the number of times the principal is compounded, t is the amount of time, and a is your final amount with interest added.
When I set variables (see below) and and type the formula in exactly how it is above on my calculators home screen, I get $7332.86, which is the correct answer.
However, when I set the variables and type the formula in as a program (see below), I get $42684.69, which is not correct.
I have tried this program on 2 different TI-84 calculators and I have gotten the same results, so it is not something with my calculator.
I am honestly stumped. I have no idea why this is happening, so if you are good at math, know how to program a ti series calculator, or just see a mistake that I am missing, please tell me because this thing has been driving me crazy!
Program with same inputs and formula but gives different answer than when used on the home screen:
: 2000 -> P
: 0.065 -> R
: 54 -> N
: 20 -> T
: P(1+(R/N))^(N)(T) -> A
: Disp A
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我不完全知道您面临的问题是什么，但我认为您的程序应该如下所示：
编辑
我认为您需要一组额外的括号。
^(N)(T)仅求N次方，然后乘以T。尝试^((N)(T))或简单地^(NT)。I don't exactly know what the problem you are facing is, but I think your program should look like this:
EDIT
I think you need an extra set of parentheses.
^(N)(T)only raises to the power ofN, and then multiplies byT. Try^((N)(T))or simply^(NT).你的公式相当于
T*P*((1+(R/N))^(N))，这显然是错误的。这样做的原因是因为操作顺序。尝试P*(1+(R/N))^(T*N)You're formula is equivalent to
T*P*((1+(R/N))^(N)), which is obviously wrong. The reason it's doing this is because of the order of operations. TryP*(1+(R/N))^(T*N)代码的较短版本（如果您想节省内存空间）：
:promptP,R,N,T
:Disp P(1+(R/N))^(NT)
快乐编码！
A shorter version of the code (if you want to conserve memory space):
:promptP,R,N,T
:Disp P(1+(R/N))^(NT)
Happy coding!