Question

我正在制作一个程序来计算用户输入字符串中字母的频率，并且最近遇到了“算术异常”错误。

我不能为我的生活找出导致它的原因，即使我知道这是因为某事被划分为0。

这是我的代码：

package day1.examples;

import java.util.Scanner;

public class rl_frequency_count {

    public static int input;

    public static void main(String[] args) {

        System.out
                .println("Please enter some text that you would like to work out the occurence for.");
        System.out
                .println("However, do remember that any other characters outside of the alphabet will NOT be counted.");

        Scanner stringUser = new Scanner(System.in);
        String input = stringUser.nextLine();
        input = input.replaceAll("\\s+", "");
        input = input.toLowerCase();

        // counting occurrence of character with loop
        int i;
        int charCountA = 0;
        int charCountB = 0;
        int charCountC = 0;
        int charCountD = 0;
        int charCountE = 0;
        int charCountF = 0;
        int charCountG = 0;
        int charCountH = 0;
        int charCountI = 0;
        int charCountJ = 0;
        int charCountK = 0;
        int charCountL = 0;
        int charCountM = 0;
        int charCountN = 0;
        int charCountO = 0;

        for (i = 0; i < input.length(); i++) {
            if (input.charAt(i) == 'a') {
                charCountA++;
                getOccurence(charCountA, "A");
            }
        }
        for (i = 0; i < input.length(); i++) {
            if (input.charAt(i) == 'b') {
                charCountB++;
                getOccurence(charCountB, "B");
            }
        }
        for (i = 0; i < input.length(); i++) {
            if (input.charAt(i) == 'c') {
                charCountC++;
                getOccurence(charCountC, "C");
            }
        }
        for (i = 0; i < input.length(); i++) {
            if (input.charAt(i) == 'm') {
                charCountM++;
                getOccurence(charCountM, "M");
            }
        }
    }

    // method for the occurrence
    public static void getOccurence(int number, String letter) {
        double occ = number / input * 10; //
        System.out.println();
        System.out.println("Number of " + letter + "'s - " + number);
        System.out.println("Occurence of " + letter + " - " + occ + "%");
    }
}

我知道我现在只有ABC和M，但是后来会有人工作。

这是我第一次在这里发帖，我仍然对Java很新，所以非常感谢任何帮助！

Answer 1

我跑了它，它说第67行。这是总数：

public static void getOccurence(int number,String letter){
    double occ = number / input *10; //
    System.out.println();
    System.out.println("Number of "+ letter +"'s - "+ number);
    System.out.println("Occurence of "+ letter +" - "+ occ + "%");
}

修复：

  double occ = (number > 0) ? number/input * 10 : 0;

如果数字设置为0，则将occ设置为0.祝你好运。希望这会有所帮助。

Answer 2

导致错误的代码行在您的方法中：

public static void getOccurence(int number,String letter){ 
    double occ = number / input *10; // <------ERROR FROM HERE (input is always 0)
    System.out.println();
    System.out.println("Number of "+ letter +"'s - "+ number);
    System.out.println("Occurence of "+ letter +" - "+ occ + "%");       
  }

{class}}变量在您的班级中声明：

input

由于您没有初始化它，也没有在代码中更改值，因此Line 6: public static int input;的值在整个程序中保持为0。（未初始化的int变量的默认值为0）

由于它始终为0，因此您始终将数字除以0。

input

Java中的算术异常，如何处理呢？

2 个答案: