C++二維數組

Question

我在學校的這個程序中遇到了一些問題。我試圖利用一個二維數組，並得到一些關於「從int到int *和'> ='的轉換錯誤：'int [5]'與'int''的間接級別不同。我可以把它寫成一維數組，但是對於二維的語法有困難。有人能指出我在正確的方向關於我可能錯過的東西嗎？我在btnShow_CLick之後註釋掉了，它工作正常，它只是btnGroup_Click，我明顯錯過了某些東西。

感謝任何可能分享一些知識的人。

static const int NUMROWS = 4; 
    static const int NUMCOLS = 5; 
    int row, col; 
    Graphics^ g; 
    Brush^ redBrush; 
    Brush^ yellowBrush; 
    Brush^ greenBrush; 
    Pen^ blackPen; 


private: System::Void Form1_Load(System::Object^ sender, System::EventArgs^ e) { 
      g = panel1->CreateGraphics(); 
      redBrush = gcnew SolidBrush(Color::Red); 
      yellowBrush = gcnew SolidBrush(Color::Yellow); 
      greenBrush = gcnew SolidBrush(Color::Green); 
      blackPen = gcnew Pen(Color::Black); 
     } 

    private: System::Void btnShow_Click(System::Object^ sender, System::EventArgs^ e) { 

     panel1->Refresh(); 

     for (int row = 0; row < NUMROWS; row++) 
     { 
      for (int col = 0; col < NUMCOLS; col++) 
      { 
       Rectangle seat = Rectangle(75 + col * 75,40 + row *40,25,25); 
       g->DrawRectangle(blackPen, seat); 
      } 
     } 
    } 

private: System::Void btnGroup_Click(System::Object^ sender, System::EventArgs^ e) { 
      int score[NUMROWS][NUMCOLS] = {{45,65,11,98,66}, 
             {56,77,78,56,56}, 
             {87,71,78,90,78}, 
             {76,75,72,79,83}}; 

     int mean; 
     int student; 
     mean = CalcMean(score[]); 
     txtMean->Text = mean.ToString(); 

     for (int row = 0; row < NUMROWS; row++) 
     { 
      for (int col = 0; col < NUMCOLS; col++) 
      { 
       student = (row*NUMCOLS) + (col); 
       Rectangle seat = Rectangle(75 + col * 75,40 + (row * 40),25,25); 
       if (score[student] >= 80 
        g->FillRectangle(greenBrush, seat); 
       else if (score[student] >= mean) 
        g->FillRectangle(yellowBrush, seat); 
       else 
        g->FillRectangle(yellowBrush, seat); 
       g->DrawRectangle(blackPen, seat); 
      } 
     } 
    } 

    private: double CalcMean(int score[]) 
    { 
     int sum = 0; 
     int students = NUMROWS * NUMCOLS; 
     for (int i=0; i< students; i++) sum += score[i]; 
     return sum/students; 
    } 

Answer 1

Score[student]相當於*(score+student)，這是一個*int。相反，您應該使用score[row][col]或其等效的**(score+student)（我強烈建議數組表示法）。它也相當於*Score[student]，但這很醜陋。

加上當我說「它是等價的」時，它只是因爲sizeof int ==sizeof (*int)。如果你在數組中使用另一種類型的指針邏輯，你可能會得到時髦的結果。