Question

所以我不确定该做什么我已经做过 / * *要完成的方法集合 *完成给定方法的每个TODO正文代码 *对第一种方法和最后一种方法使用递归 * /

public class Methods 
  /*
   * method to compute value of f(n) where:
   * f(1) = 1
   * f(n) = n + f(n-1) for n>1, n is even
   * f(n) = n * f(n-1) for n>1, n is odd
   */
  public static int f(int n) {
    //TODO

    return 0; //dummy line, replace this
  }

  /*
   * method to compute the sum of the proper divisors of a given positive integer, n
   * e.g., if n is 12, the sum of the proper divisors is:
   * 1 + 2 + 3 + 4 + 6 = 16
   * note: proper divisors are all divisors of an integer other than itself
   */
  public static int sumOfDivisors(int n) {
    //TODO

    return 0; //dummy line, replace this
  }


  /*
   * method that returns a String indicating whether a given positive integer, n, is:
   * "abundant" - sum of proper divisors is greater than n
   * "deficient" - sum of proper divisors is less than n  
   * "perfect" - sum of proper divisors is equal to n
   */
  public static String numberType(int n) {
    //TODO

    return "foo"; //dummy line, replace this
  }

  /*
   * method that returns the sum of the digits of the positive integer, n
   * e.g., if n = 5403, the method will return:
   * 5+4+0+3 = 12
   * note: the right-most (1's) digit can be found using n%10
   * the remaining digits (all but the 1's digit) can be found using n/10
   */
  public static int sumOfDigits(int n) {
    //TODO

    return 0;  //dummy line, replace this
  }

  //a dummy main method, not used
  public static void main(String[] args) {
    System.out.println("This program is not meant to be run on its own.");
    System.out.println("This is just a dummy main method.");
  }

} //end Methods

所以，任何帮助都会很棒。

Answer 1

所以我不确定该怎么做我已经做过的事情

您实际上只编写了方法声明。您的任务记录真实，您可以尝试实施这些实用程序（如public int[] divisors(int n)等）并最终返回此处并询问您的疑虑，发布代码或错误。

PS：这似乎是一项学术任务，你检查了一些书籍或笔记吗？

我对这个方法和递归非常感到困惑

1 个答案: