Java - 实数幂 n^k

Question

我在编写程序来解决 Java 教科书上的这个练习时遇到困难:

Write a method raiseRealToPower that takes a floating-point value x and an integer k and returns xk. Implement your method so that it can correctly calculate the result when k is negative, using the relationship x^(-k) = 1 / x^k.

Use your method to display a table of values of πk for all values of k from –4 to 4.

我没有用 PI 完成这部分，我知道，如果我的程序开始工作...这就是我所做的...请告诉我，出了什么问题。

import acm.program.*;

public class vjezba55 extends ConsoleProgram {

    private static final double PI = 3.14159253;

    public void run() {
        double x = readDouble ("x: ");
        double k = readDouble ("k: ");
        println ("x^k = " + raiseDoublePower(x,k)); 
    }

    /* Method that counts x^k */
    private double raiseDoublePower (double x, double k){
        if (k >= 0) {
            return Math.pow(x, k);
        }
        else {
            double total = 1;
            for (int i= 0; i>k; i--) {
                total = (double) 1 / x;
            }
            return total;
        }
    }
}

Answer 1

看看你的循环代码。您只是在每次迭代中从头开始重新计算 total，而不是更新之前的结果。