How to define array in c language

The definition of arrays in C language has four forms: 1. The form with only array type and array name; 2. The form with determined array length; 3. Use the new keyword to allocate memory to the array method; 4. Use the new keyword and assign a value to the array.

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Definition of array

Array refers to a collection used to store the same type of data. An array is actually a series of variables. Arrays can be divided according to their use. For one-dimensional arrays, two-dimensional arrays, and multi-dimensional arrays

Array definition methods

There are four forms of array definition methods, namely:

(1) Type name [] Array name;

(2) Type name [] Array name = { Initial value list };

(3) Type name [] Array name = new Type name [array size];

(4) Type name [] array name = new type name [array size] { initial value list };

Data type: refers to the array element Data types, common ones include integer, floating point, character, etc.
Array name: It is used to unify the name of this group of elements of the same data type, and its naming rules are the same as those of variables

Connection Next, I will introduce how to define an array through specific examples

Definition of one-dimensional array

int[]  nullArray;
int[]  intArray = new int[ 10 ];
double[]  mathConsts = { 3.14,2.71828,1.414 };
Days[]  holiday = new Days[ 2 ]{ Days.Sat,  Days.Sun};

Definition of two-dimensional array

In some cases, one-dimensional arrays can no longer meet the needs of the application. When we need to record data in a table, it will be very inconvenient to use one-dimensional arrays because we need to use two-dimensional arrays

Type name[,] Array name;

Type name[,] Array name = { Initial value list};

Type name[,] Array name = new Type name[line , column];

type name[,] array name = new type name[row, column] {initial value list};

int[,] intArray = new int[ 10, 20 ];
double[ 2, 3 ] mathConsts= { { 3.14, 2.71828, 1.414 }, { 0.5, 0.25, 0.125 } };
Days[,] workDays = new Days[ 2, 2 ] { { Days.Mon, Days.Wed }, { Days.Tue, Days.Thu }  };

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