ArTimon's questions

我无法理解它的工作原理，在button_onclick事件的开头我调用textBox.Clear()，即我希望每次单击此按钮时，文本框都会被清除，但如果我不关闭表单，则不会发生这种情况，输出结果会累积。在这段代码中：

private void but_OK_Click(object sender, EventArgs e)
        {
            txt_output.Clear();
            string str_input = txt_input.Text;

            Format_Rule(str_input);

            for (int i = 0; i < str_in.Count; i++)
            {
                txt_output.Text += str_in.GetKey(i) + " " + str_in.Get(i) + Environment.NewLine;
            }
        }

这是所有代码

using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace ТЯП_Лаб1
{
    public partial class Form1 : Form
    {
        NameValueCollection str_in = new NameValueCollection();

        string alphabet = "abcdefghijklmnopqrstuvwxyz";
        string alpha_number = "0123456789";
        string alpha_operand = "-+*/";

        private bool Search_Operand(string str)
        {
            for (int i = 0; i < alpha_operand.Length; i++)
            {
                if (str.Contains(alpha_operand[i]))
                {
                    return true;
                }
            }
            return false;
        }

        private bool Search_Number(string str)
        {
            for (int i = 0; i < alpha_number.Length; i++)
            {
                if (str.Contains(alpha_number[i]))
                {
                    return true;
                }
            }
            return false;
        }

        private bool Search_Word(string str)
        {
            for (int i = 0; i < alphabet.Length; i++)
            {
                if (str.Contains(alphabet[i]))
                {
                    return true;
                }
            }
            return false;
        }
        
        private void Format_Rule(string str )
        {
            string str_oper = "";
            string str_set = "";

            if (!Search_Operand(str))
            {
                for (int i = 0; i < str.Length; i++)
                {
                    if(i == str.Length)
                        str_set += str[i];
                    else
                        str_set += str[i] + " | ";
                }

                str_in.Add("S->", "T");
                str_in.Add("T->", "T | TF");
                str_in.Add("F->", str_set);

            }
            else
            {
                for (int i = 0; i < str.Length; i++)
                {
                    if(str[i] == '+' || str[i] == '-' || str[i] == '*' || str[i] == '/')
                    {
                        if(i != str.Length)
                            str_oper += str[i] + "T" + " | ";
                        else
                            str_oper += str[i] + "T";
                    }
                    else
                    {
                        if(i != str.Length)
                            str_set += str[i] + " | ";
                        else
                            str_set += str[i];
                    }
                }

                str_in.Add("S->", str_oper);
                str_in.Add("T->", "T | TF");
                str_in.Add("F->", str_set);
            }
        }

        public Form1()
        {
            InitializeComponent();
        }

        private void but_OK_Click(object sender, EventArgs e)
        {
            txt_output.Clear();
            string str_input = txt_input.Text;

            Format_Rule(str_input);

            for (int i = 0; i < str_in.Count; i++)
            {
                txt_output.Text += str_in.GetKey(i) + " " + str_in.Get(i) + Environment.NewLine;
            }
        }
    }
}

请帮我弄清楚为什么它在第一行显示街道名称两次。注解。一般来说，我有一个 .DAT 文件（包含名称、街道、房屋、公寓、日期的数据库），我试图将其放入类似的结构中。第一种方法：通过fread，看起来正常填充到结构体中（还有一个问题是调试器中数据（象形文字）显示不正确，看不到字段中保存的内容，这是一个问题，据我了解，由于编码的原因，我不知道该怎么做），所以我只能通过字符数来判断，例如姓氏_名字_父名。但输出是随机的，同一件事会输出多次，一行中的数据从另一行出现在某处，房屋和公寓号码要么通过存储单元的编号要么通过其他方式输出。在屏幕上方法一。第二种方法：笨拙，我通过文件运行fgetc，将其保存到临时数组中，我将它倒入结构中。现在数据显示得更好了，但我不明白第二次第一行的街道来自哪里。如果你逐个字符地显示它，它就不在那里，如果%s那么它就会出现。这两种结构只是举例。文件链接

`

#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <io.h>
#include <Windows.h>

FILE * fp;
char bp[255] = "";
int m = 0;

struct adres_book
{
    char fio[32];
    char street[20];
    unsigned int home;
    unsigned int flat;
    char date[8];
}book;

struct adres_book2
{
    char fio[32];
    char street[20];
    unsigned int home;
    unsigned int flat;
    char date[8];
}book2;

void abb() {
    int i = 0;
    int j = 0;
    int t = 0;
    int k = 0;
    int l1 = 32;
    int l2 = 20;
    int l3 = 8;

    for (int i = 0; i < 64; i++) {
        bp[i] = fgetc(fp);
    }

    for (i = m; i < l1 + m; i++) {
        book2.fio[k] = bp[i];
        k++;
    }
    k = 0;
    for (j = i; j < l2 + i; j++) {
        book2.street[k] = bp[j];
        k++;
    }
    k = 0;
    book2.home = bp[j];
    j++;
    j++;
    book2.flat = bp[j];
    for (t = j + 2; t <= j + 2 + l3; t++) {
        book2.date[k] = bp[t];
        k++;
    }
    k = 0;
    m = t;
}

int main() {
    fp = fopen("BASE4.DAT", "r");

    if (fp == NULL) {
        printf("Error File!\n");
        system("pause");
        exit(1);
    }

    //memset(&book, 0, sizeof(book));

    rewind(fp);

    fread(book.fio, sizeof(book.fio), 32, fp);
    fread(book.street, sizeof(book.street), 20, fp);
    fread(&book.home, sizeof(book.home), 1, fp);
    fread(&book.flat, sizeof(book.flat), 1, fp);
    fread(book.date, sizeof(book.date), 8, fp);

    rewind(fp);

    abb(); // Топорный метод

    printf("Method one: \n\n%s\n%s\n%u %u\n%s\n+--------+\n", book.fio, book.street, &book.home, &book.flat, book.date);

    printf("\nMethod two: \n\n%s\n%s\n%u %u\n%s\n", book2.fio, book2.street, book2.home, book2.flat, book2.date);

    for (int y = 0; y < 31; y++)
        printf("%c", book.fio[y]);

    system("pause");
}