如何使此代码不返回无限循环？答案

【问题标题】：How can I make this code not return an infinite loop?如何使此代码不返回无限循环？
【发布时间】：2020-01-23 02:24:08
【问题描述】：

我想我必须使用 String goAgainResponse 来避免无限循环，但我不知道该代码会是什么样子。我应该通过添加 4 - 4/3 + 4/5 - 4/7 + 4/9 等来近似 pi >

      int term;
      int counter = 1;
      double piCalc=0.0;
      String goAgainResponse = null;
      boolean goAgain = false;
      Scanner kb = new Scanner(System.in);

      /* NOTE you may not declare any additional variables */

      do
      {

         System.out.println("This program will approximate Pi based on the following series:");
         System.out.println("4 - 4/3 + 4/5 - 4/7 + 4/9 - ...");

         System.out.println("Enter the term number to which you would like to approximate Pi");

         term = kb.nextInt();
         while(term <= 9)
         {
            System.out.print("Please enter a number greater than 9:");
            term = kb.nextInt();
         }

         while(term > 9)
         {
            term += 1;
            piCalc = 4/(2 * term - 1);
            System.out.print(piCalc);
         }

         System.out.print("Would you like to try again (yes/no)? ");
     }while(goAgain);

【问题讨论】：

标签： java loops while-loop infinite-loop do-while

【解决方案1】：

while(term <= 9)
     {
        System.out.print("Please enter a number greater than 9:");
        term = kb.nextInt();
     }

在这里，您是说 term 应该大于 9。但是您在第二个循环中的条件是 term>9 并且您在 term 中添加值，这就是为什么第二个循环是无限的

while(term > 9)
     {
        term += 1;
        piCalc = 4/(2 * term - 1);
        System.out.print(piCalc);
     }

更改第二个循环的条件将解决您的问题。或者再次考虑term+=1。

同样根据@Scary Wombat，boolean doagain 的值永远不会设置

【讨论】：

【解决方案2】：

boolean goAgain = false;

这永远不会设置为任何其他值，并且循环仅在它为 true 时循环

【讨论】：