Question

我有一个2D数组的代码：

#include<iostream>
using namespace std;  

const int CITY = 2;
const int DAYS = 3;

int main()
{
    int temperature [CITY][DAYS];
    int value, rowPosition, columnPosition;

    // Insertion
    for (int i = 0; i < CITY; i++)
    {
         for(int j = 0; j < DAYS; j++)
         {
             cout << "City " << i + 1 << ", Day " << j + 1 << " : ";
             cin >> temperature[i][j];
         }
    }  

    // Deletion
    cout << "Enter row-position to delete: ";
    cin  >> rowPosition;

    cout << "Enter column-position to delete: ";
    cin  >> columnPosition;

    for (int i = rowPosition; i < CITY; i++)
    {
        for(int j = columnPosition; j < DAYS; j++)
        {
           temperature[rowPosition][columnPosition] = temperature[rowPosition + 1][columnPosition + 1];
        }
    }  

    // Search
    cout << "Enter value to search: ";
    cin  >> value;

    for (int i = 0; i < CITY; i++)
    {
        for(int j = 0; j < DAYS; j++)
        {
            if(value == temperature[i][j])
            {   
                cout << "The value " << value << " is found at index " << i + 1 << " " << j + 1 << endl;
            }
        }
    }  

    // Display
    for (int i = 0; i < CITY; i++)
    {
        for(int j = 0; j < DAYS; j++)
        {
            cout << "City " << i + 1 << ", Day " << j + 1 << " = " << temperature[i][j] << endl;
        }
    }  
return 0;  
}

例如，CITY = 2和DAYS = 3表示2D数组由2行和3列组成。现在我想从这个2D数组中删除一个元素，比如位置row = 2，col = 1的元素。

我尝试了上面提到的删除代码，但它再次显示了相同的数组而没有删除。

Answer 1

您错过了#include

的'＃'

我看到你要做的是什么，实际上并没有删除任何内容，只是将所有内容都移到了“删除”索引上？注意：这不是嵌套的for循环。这就是我要做的事情

temperature[rowPosition][columnPosition] = 0;       // in case at the end of array
for (int i = columnPosition; i < DAYS-1; i++)
    temperature[rowPosition][i] = temperature[rowPosition][i + 1]; // move all back

从2D Array C ++中删除单个元素

1 个答案: