C＃中的循環問題比較兩個數組

我正在創建一個C＃GUI應用程序，我遇到了問題，我的循環中，應用程序獲取帶有學生驅動程序考試答案的A，B，C或D的.txt文件然後將它與代碼中數組中的正確答案進行比較。無論答案是正確還是不正確，我的循環總是會給我所有答案都不正確。C＃中的循環問題比較兩個數組

我的界面

enter image description here

我的代碼：

using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.Windows.Forms; 
using System.IO; 

namespace Mohammad_Saad_Assignment_1_Part_2_Sec_B 
{ 
public partial class Form1 : Form 
{ 
    //Acutal answers 
    string[] correctAnswers = { "B", "D", "A", "A", "C", "A", "B", "A", "C", "D", "B", 
      "C", "D", "A", "D", "C", "C", "B", "D", "A" }; 

    //Student answers array of size 20 
    string[] studentAnswers = new string[20]; 

    public Form1() 
    { 

     InitializeComponent(); 
    } 

    private void btnOpen_Click(object sender, EventArgs e) 
    { 
     listBox2.Items.AddRange(correctAnswers); 

     //Opening a new file. 
     OpenFileDialog open = new OpenFileDialog(); 
     //Dismiss user cancelation so application dosnt crash. 
     if (open.ShowDialog() == DialogResult.OK) 
     { 
      path.Text = open.FileName; 
     } 

     StreamReader sReader = new StreamReader(open.FileName); 
     int index = 0; 

     while (index < correctAnswers.Length && !sReader.EndOfStream) 
     { 
      correctAnswers[index] = sReader.ReadLine(); 
      index++; 
     } 
     foreach (string str in correctAnswers) 
     { 
      listBox1.Items.Add(str); 
     } 

     btnOpen.Enabled = false; 

    } 

    private void button1_Click(object sender, EventArgs e) 
    { 
     int i = 0; 
     int questionNumber = 1; 
     int answersCorrect = 0; 
     int answersIncorrect = 0; 
     do 
     { 
      if (studentAnswers[i] == correctAnswers[i]) 
      { 
       answersCorrect++; 
      } 
      if (studentAnswers[i] != correctAnswers[i]) 
      { 
       listBox3.Items.Add("Question " + questionNumber); 
       listBox3.Items.Add("Incorrect"); 
       answersIncorrect++; 
      } 
      i++; 
      questionNumber++; 
     } 

     while (i != 20); 
     lblCorrect.Text = answersCorrect.ToString(); 
     lblInCorrect.Text = answersIncorrect.ToString(); 
     if (answersCorrect >= 15) 
     { 
      txtResults.Text = "PASS"; 

     } 
     if (answersCorrect < 15) 
     { 
      txtResults.Text = "FAIL"; 

     } 

     btnMark.Enabled = false; 
    } 

    private void btnClear_Click(object sender, EventArgs e) 
    { 
     btnOpen.Enabled = true; 
     btnMark.Enabled = true; 
     listBox1.Items.Clear(); 
     listBox3.Items.Clear(); 
     txtResults.Clear(); 
    } 
} 
}

的問題是，我認爲是在標記按鈕（按鈕1）任何幫助深表感謝。

來源

2013-09-28 user2318228

文件中的字符大小寫是什麼？他們是大寫的「A，B，C ...」還是小寫的「a，b，c」？ – Alireza

嗨Alireza，我也使用大寫，謝謝 – user2318228

更改此代碼塊：

while (index < correctAnswers.Length && !sReader.EndOfStream) 
{ 
    correctAnswers[index] = sReader.ReadLine(); 
    index++; 
} 
foreach (string str in correctAnswers) 
{ 
    listBox1.Items.Add(str); 
}

到：

while (index < correctAnswers.Length && !sReader.EndOfStream) 
{ 
    studentAnswers[index] = sReader.ReadLine(); 
    index++; 
} 
foreach (string str in studentAnswers) 
{ 
    listBox1.Items.Add(str); 
}

來源

2013-09-28 06:27:09 jomsk1e

你有這條線，當你在學生的答案閱讀：

correctAnswers[index] = sReader.ReadLine();

它應該是：

studentAnswers[index] = sReader.ReadLine();

來源

2013-09-28 06:24:19 Enigmativity

正是。然後在兩個列表框中顯示相同的數組。但是當他檢查結果時，他比較了數組{{null，null，null，...}到'{「B」，「D」，「A」，...}。一個無關的建議是驗證文件內容。像文件「A」（帶有空格）的字符串可能會導致更細微的錯誤。 –

通常，使用調試器並逐步執行代碼將對您有所幫助。

來源

2013-09-28 07:04:21

C＃中的循環問題比較兩個數組

回答

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