用Java计算折扣系数

Question

I am trying to calculate monthly loan payments the formula Loan Payment = Amount / Discount Factor on www.thebalance.com According to the website discount factor is calculated with this formula (D) = {[(1 + i) ^n] - 1} / [i(1 + i)^n] I tried interpreting this into Java and came up with

double discountFactor = (Math.pow((1 + interest), numberOfPayments) - 1) / Math.pow(interest * (1 + interest), numberOfPayments);

But it outputs infinity am not so good with Math, can someone help point out the issue?

Answer 1

double discountFactor = (Math.pow((1 + interest), numberOfPayments) - 1) /
                        (interest  * Math.pow((1 + interest), numberOfPayments));

interest is not part of the power, it should be outside power.

Answer 2

将“利息”放在第二个幂函数之外，而不是在里面。

double discountFactor = (Math.pow((1 + interest),numberOfPayments)-1)/(interest*Math.pow((1+interest),numberOfPayments));