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:
数据类型 数组名[行数][列数];
For example:
int matrix[3][4];
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:
int matrix[3][4] = { {1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10, 11, 12} };
- Row-level initialization:
int matrix[3][4] = { [0] = {1, 2, 3, 4}, [1] = {5, 6, 7, 8}, [2] = {9, 10, 11, 12} };
- Using pointers:
int *matrix = (int *)malloc(3 * 4 * sizeof(int));
Accessing elements in a two-dimensional array
You can use row and column index to access elements in a two-dimensional array:
matrix[行号][列号];
For example:
printf("%d", matrix[1][2]); // 输出 7
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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