字符计数器程序

时间:2018-11-20 17:42:16

标签: c# arraylist casting char ascii

我正在尝试创建一个程序,该程序对文件中的ASCII字符进行计数,并跟踪每个字符在文件中出现的次数。然后,应将输出写入文件。如果文件仅显示为“ Hello”,则输出文件的格式应显示为:

H(72)1 e(101)1 l(108)2 o(111)1 (46)1

我到目前为止编写的代码如下:

using System.IO;
using System;
using System.Collections;

class CharacterFrequency
{
    char ch;
    int frequency;
    public char getCharacter()
    {
        return ch;
    }
    public void setCharacter(char ch)
    {
        this.ch = ch;
    }
    public int getfrequency()
    {
        return frequency;
    }
    public void setfrequency(int frequency)
    {
        this.frequency = frequency;
    }


    static void Main()
    {
        string OutputFileName;
        string InputFileName;
        Console.WriteLine("Enter the file path");
        InputFileName = Console.ReadLine();

        Console.WriteLine("Enter the outputfile name");
        OutputFileName = Console.ReadLine();
        StreamWriter streamWriter = new StreamWriter(OutputFileName);

        string data = File.ReadAllText(InputFileName);

        ArrayList al = new ArrayList();
        al.Add(data);
        //create two for loops to traverse through the arraylist and compare
        for (int i = 0; i < al.Count; i++)
        {
            //create variable k to count the repeated element
            //(if k>0 it means that the particular element is not the first instance)
            int k = 0;
            //count frequency variable
            int f = 0;
            for (int j = 0; j < al.Count; j++)
            {
                //compare the characters
                if (al[i].Equals(al[j]))
                {
                    f++;
                    if (i > j) { k++; }
                }
            }
            if (k == 0)
            {
                //Display in the correct format
                Console.Write(al[i] + "(" + (int)al[i] + ")" + f + " ");
            }

        }



    }
}

在代码的最后一行(Console.Write)上出现错误,指出:“指定的强制转换无效。”我知道该程序可能无法正确编写,但是我很难使用数组列表来完成此任务。我已经在以前的程序中使用排序字典完成了此任务,但是现在我必须使用数组列表。非常感谢您提供有关如何纠正错误以及程序外观的任何建议。

1 个答案:

答案 0 :(得分:0)

保持类似的效果,我可以运行它。如果将其保留为字符串并将其视为char数组,则效果很好。

 string data = "Hello";
    for (int i = 0; i < data.Length; i++)
    {
        int k = 0;
        int f = 0;
        for (int j = 0; j < data.Length; j++)
        {      
            if (data[i].Equals(data[j]))
            {
                f++;
                if (i > j) { k++; }
            }
        }

            //Display in the correct format
            Console.Write(data[i] + "(" + (int)data[i] + ")" + f + " ");
    }