How to define a two-dimensional array in c++

How to define a two-dimensional array in C: declare the array type: int arr row number; use nested loops to initialize the array elements; use the subscript operator to access the array elements.

Define a two-dimensional array in C

In C, a two-dimensional array is a data structure, using Used to store data organized in rows and columns. To define a two-dimensional array, use the following steps:

Declare the array type

<code class="cpp">int arr[行数][列数];</code>

where:

• arr is the name of the array.
• Number of rows and Number of columns Specify the number of rows and columns of the array.

For example:

<code class="cpp">int matrix[3][4]; // 声明一个 3 行 4 列的整数数组</code>

Initializing the array

After declaring an array, you can use a nested loop to initialize it element.

For example:

<code class="cpp">for (int i = 0; i < 3; i++) {  // 遍历行
    for (int j = 0; j < 4; j++) {  // 遍历列
        matrix[i][j] = i * j;  // 初始化元素
    }
}</code>

To access array elements

you can use the subscript operator[] Access array elements.

For example:

<code class="cpp">int element = matrix[1][2];  // 获取第 2 行第 3 列的元素（索引从 0 开始）</code>

Note:

• Arrays in C are fixed and cannot be changed once created Change its size.
• The elements of a two-dimensional array are stored continuously in memory, so pointers can be used to quickly access elements.

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