Dark Horse programmer--c Language Foundation---Two-dimensional array

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Two-dimensional arrays:

Can be seen as a special one-dimensional array, and each element of this one-dimensional array is a one-dimensional array

Definition of a two-dimensional array

Data type array name [length of first dimension (row)] [Length of second Dimension (column)];

int a[2][3];
Understanding Method:
1) This is a special one-dimensional array, one-dimensional array has two elements a[0] a[1]
A[0] It also stores a one-dimensional array with an array length of 3

2) defines a matrix of 2 rows and 3 columns

Initialization of two-dimensional arrays


1) Simultaneous initialization of the definition


(1) Full initialization

int a1[2]={1,2};

1, a special one-dimensional array, the first dimension has 2 elements
int a[2][3]={{12,23,45},{1,2,3}}; Segmentation

12 23 45
1 2 3

2. Continuous Assignment
int a[2][3]={1,2,3,4,5,6};

3, can omit the first dimension
int a[][3]={{1,2,3},{3,4,5},{3,4,5}}; int a[3][3]
int a[][2]={1,2,3,4,5,6,7,8}; int a[4][2]


(2) Partial initialization

In general, we used to initialize the array to 0.
int a[3][4]={1};

1 0 0 0
0 0 0 0
0 0 0 0

int a[3][4]={{1},{2},{3}};

1 0 0 0
2 0 0 0
3 0 0 0

Note: The first-dimensional length of this notation can be omitted

int a[3][4]={1,2,3,4,5};

1 2 3 4
5 0 0 0
0 0 0 0

Omit the first dimension

2) Define first, then initialize

int a[3][4];
First-Dimension subscript: 0 1 2
Second-dimension subscript: 0 1 2 3
A[0][0] = 1;

Traversal of two-dimensional arrays:

Accesses each element of a two-dimensional array

How do I access it?

Access by subscript

int a[3][4];

| 0 1 2 3
--------------------------------
0 | 00 01 02 03

1 | 10 11 12 13

2 | 20 21 22 23

Dark Horse programmer--c Language Foundation---Two-dimensional array