How to represent two-dimensional array in c language

Two-dimensional arrays store table-like data and are declared as the data type of arrays in C language. Initialization methods include: 1) element-by-element initialization; 2) row-level initialization; 3) using pointers. Element access is via row and column index.

Representation of two-dimensional array in C language

Two-dimensional array is used to represent a two-dimensional array with row and column dimensions Table-like data structure. In C language, a two-dimensional array is declared as a data type whose data type is array.

Declare a two-dimensional array

Syntax:

<code class="c">数据类型 数组名[行数][列数];</code>

For example:

<code class="c">int matrix[3][4];</code>

This will declare an array named matrix is a two-dimensional array of integers with 3 rows and 4 columns.

Initializing a two-dimensional array

A two-dimensional array can be initialized in three ways:

• Element-by-element initialization:

<code class="c">int matrix[3][4] = {
    {1, 2, 3, 4},
    {5, 6, 7, 8},
    {9, 10, 11, 12}
};</code>

• Row-level initialization:

<code class="c">int matrix[3][4] = {
    [0] = {1, 2, 3, 4},
    [1] = {5, 6, 7, 8},
    [2] = {9, 10, 11, 12}
};</code>

• Using pointers:

<code class="c">int *matrix = (int *)malloc(3 * 4 * sizeof(int));</code>

Accessing elements in a two-dimensional array

You can use row and column index to access elements in a two-dimensional array:

<code class="c">matrix[行号][列号];</code>

For example:

<code class="c">printf("%d", matrix[1][2]);  // 输出 7</code>

Memory representation

In memory, a two-dimensional array is stored as a contiguous block of elements. Rows are stored in adjacent memory locations, and columns are stored in adjacent locations to the rows.

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