What does 2d mean in c language

In C language, "2d" means a two-dimensional array, which is a collection of elements consisting of rows and columns that can be used to store related data, such as tables, images, or data on a chessboard.

#What does 2d mean in C language?

In C language, "2d" represents a two-dimensional array.

Two-dimensional array

A two-dimensional array is a collection of elements composed of rows and columns. It can be viewed as a table where elements are stored at the intersection of rows and columns.

Two-dimensional arrays are usually used to store related data, such as:

• Data in a table
• Pixels in an image
• On a chessboard Grid

Declaring a two-dimensional array

To declare a two-dimensional array, you need to specify the type, number of rows, and number of columns of the array. Here's how to declare a 3-row, 4-column two-dimensional array of integers:

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

The above declaration creates a 3 x 4 array of integers. This means that the array has 3 rows and each row has 4 elements.

Accessing two-dimensional array elements

You can use row and column index to access the elements of two-dimensional array. Here's how to access the element in row 2, column 3 of an array:

<code class="c">array[1][2];</code>

Example

The following is an example that shows how to store an image using a two-dimensional array Pixels:

<code class="c">#include <stdio.h>

int main() {
    // 创建一个 3 x 3 的整数数组来存储像素值
    int pixels[3][3] = {
        {255, 255, 255},
        {0, 0, 0},
        {255, 255, 255}
    };

    // 打印像素值
    for (int i = 0; i < 3; i++) {
        for (int j = 0; j < 3; j++) {
            printf("%d ", pixels[i][j]);
        }
        printf("\n");
    }

    return 0;
}</code>

Output:

<code>255 255 255 
0 0 0 
255 255 255 </code>

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