Two-dimensional arrays

One-dimensional array definition:

data type [] Array name = new data type [array length];

data type [] Array name = new data type [array length]{1,2,3 ...};

Two-dimensional array definitions:

data type [,] array name = new data type [number of rows, number of columns];

int[,] a = new int[3,4];

Assignment: a[row subscript, column subscript] = value subscript is starting from 0

Value: a[row subscript, column subscript]

Jagged data, an array of array definitions:

The first step: Define a large group

data type [] A = new data type [number of rows] []; Number of columns not written

Step two: Define the decimal group

Data type [] a1 = new data type [number of columns];

Data type [] a2 = new data type [number of columns];

......

Part III: Placing decimal groups in large arrays

A[0] = A1;

A[1] = A2;

......

Two-dimensional arrays and jagged arrays:

int[,] a = new int [3][4]; Wrong
Int[][] A = new int[3,4];//error
Int[][] A = new int[3][4];//error
int[,] C = new int[3,4];//pair

C.length = = ;

Int[][] A = new int[3][];

int[] A1 = new int[] {3, 4, 5, 6, 7};
int[] A2 = new int[] {1, 2, 3};
int[] a3 = new int[] {7, 8, 9, 10};

A[0] = A1;
A[1] = A2;
A[2] = A3;
A.length = = 3;

Two-dimensional arrays