Java控制台无限次打印出“infinity”，而不是值？

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英文:

Java console printing out "infinity" infinite times instead of value?

问题

我正试图制作一个程序，使用莱布尼茨公式估计圆周率，作为庆祝圆周率日的一部分。然而，与其打印出我想要的估计圆周率值，控制台却打印出了“无穷大”，一直打印直到我终止执行。我非常困惑，需要帮助！
代码：

  1. import java.util.Scanner;
  2. class Main {
  3.   public static void main(String[] args) {
  4.     //为了庆祝圆周率日，我制作了这个使用莱布尼茨公式计算圆周率的程序
  5.      System.out.println("请输入您想要的迭代次数：");
  6.     double EstimatedPi = 0;
  7.     Scanner input = new Scanner(System.in);
  8.     double iterations = input.nextDouble();
  9.     double denominator = 1;
  10.     for(int i = 0; i < iterations; i++){
  11.       if(i % 2 == 0){
  12.         EstimatedPi = EstimatedPi + (1 / denominator);
  13.       }
  14.       else{
  15.         EstimatedPi = EstimatedPi - (1 / denominator);
  16.       }
  17.       denominator = denominator + 2;
  18.       EstimatedPi = EstimatedPi * 4;
  19.       System.out.println(EstimatedPi);
  20.     }
  21.   }
  22. }

我认为在整个程序中我没有除以零的情况！
莱布尼茨公式：
https://en.wikipedia.org/wiki/Leibniz_formula_for_π
控制台截图：
screenshot
我的repl项目链接：
https://repl.it/@HarryPengRHS/Determining-the-value-of-pi-pi-day-attribute

英文:

I am trying to make a program that estimates pi with the Leibniz equation as an attribute to pi day, however instead of printing out the estimated pi value that I wanted the console is printing out "infinity" for infinite times until I terminate the execution. I am very very confused, help needed!
code:

  1. import java.util.Scanner;
  2. class Main {
  3.   public static void main(String[] args) {
  4.     //in order to celebrate pi day I have made this program that calculates pi with the Leibniz Formula
  5.      System.out.println(&quot;enter the number of iterations you want:&quot;);
  6.     double EstimatedPi=0;
  7.     Scanner input= new Scanner(System.in);
  8.     double iterations=input.nextDouble();
  9.     double denominator = 1;
  10.     for(int i=0;0&lt;iterations;i++){
  11.       if(i%2 == 0){
  12.         EstimatedPi=EstimatedPi + (1/denominator);
  13.       }
  14.       else{
  15.         EstimatedPi=EstimatedPi-(1/denominator);
  16.       }
  17.       denominator=denominator+2;
  18.       EstimatedPi=EstimatedPi*4;
  19.       System.out.println(EstimatedPi);
  20.     }
  21.   }
  22. }

I don't think I divided anything by zero in the entire program!
the Leibniz formula:
https://en.wikipedia.org/wiki/Leibniz_formula_for_π
console screenshot:
screenshot
link to my repl project:
https://repl.it/@HarryPengRHS/Determining-the-value-of-pi-pi-day-attribute

答案1

得分: 1

Your for loop condition is wrong it should be for (int i = 0; i < iterations; i++)
you were using for(int i=0; 0 < iterations; i++){
0 < iterations which is always true and loop goes to infinite.

  1. public class Main {
  3.     public static void main(String[] args) {// in order to celebrate pi day I have made this program that calculates pi
  4.                                             // with the Leibniz Formula
  5.         System.out.println("enter the number of iterations you want:");
  6.         double EstimatedPi = 0;
  7.         Scanner input = new Scanner(System.in);
  8.         double iterations = input.nextDouble();
  9.         double denominator = 1;
  10.         for (int i = 0; i < iterations; i++) {
  11.             if (i % 2 == 0) {
  12.                 EstimatedPi = EstimatedPi + (1 / denominator);
  13.             } else {
  14.                 EstimatedPi = EstimatedPi - (1 / denominator);
  15.             }
  16.             denominator = denominator + 2;
  17.             EstimatedPi = EstimatedPi * 4;
  18.             System.out.println(EstimatedPi);
  19.         }
  20.     }
  21. }
英文:

Your for loop condition is wrong it should be for (int i = 0; i &lt; iterations; i++)
you were using for(int i=0;0&lt;iterations;i++){
0&lt;iterations which is always true and loop goes to infinite.

  1. public class Main {
  3. 	public static void main(String[] args) {// in order to celebrate pi day I have made this program that calculates pi
  4. 											// with the Leibniz Formula
  5. 		System.out.println(&quot;enter the number of iterations you want:&quot;);
  6. 		double EstimatedPi = 0;
  7. 		Scanner input = new Scanner(System.in);
  8. 		double iterations = input.nextDouble();
  9. 		double denominator = 1;
  10. 		for (int i = 0; i &lt; iterations; i++) {
  11. 			if (i % 2 == 0) {
  12. 				EstimatedPi = EstimatedPi + (1 / denominator);
  13. 			} else {
  14. 				EstimatedPi = EstimatedPi - (1 / denominator);
  15. 			}
  16. 			denominator = denominator + 2;
  17. 			EstimatedPi = EstimatedPi * 4;
  18. 			System.out.println(EstimatedPi);
  19. 		}
  20. 	}
  21. }

答案2

得分: 0

我遇到了同样的问题（控制台打印“-Infinity”）。

对我来说，我正在尝试对一个空数组取最大值

Math.max(...[]) 打印出 -Infinity

希望这能帮助其他遇到这个问题的人。

英文:

I ran into this same issue (console printing "-Infinity").

For me, I was trying to take the maximum of an empty array

Math.max(...[]) prints -Infinity

Hope this helps somebody else that runs into this problem

huangapple
  • 本文由 发表于 2020年3月15日 11:42:46
  • 转载请务必保留本文链接：https://go.coder-hub.com/60689537.html
  • console
  • exception
  • java
  • loops
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