C language: talking about various complex statements

Beginners are often at a loss in the face of various complex statements , It can even be said to be confused , I don't know where to start , This article is about C Talk about all kinds of complex statements in language , Hope to help beginners , The next time you encounter a complex statement, don't be confused .

Let's first look at some symbols of complex declarations

Symbol	meaning
*	It means a pointer
( )	Represents a function
[ ]	Represents an array

Here are some examples of more complex declarations ：
If you can understand the following examples , That means you are excellent ~

1.int board[8] [8];	 	// Declare a statement that contains int Array of arrays 
2.int ** ptr;		    // Declare a pointer to a pointer , The pointed pointer points to int
3.int * risks[10];		// Declare an array containing ten elements , Every element is a point to int The pointer to 
4.int (* rusks)[10];	// Declare a pointer to an array , The array contains ten int Type value 
5.int * oof[3] [4];		// Make a statement 3*4 Two dimensional array of , Every element points to int Pointer to type 
6.int (* uuf)[3] [4];	// Declare a point to 3*4 Pointer to a two-dimensional array , The array contains int Type value 
7.int (*uof[3])[4];		// Make a statement 3 An array of pointer elements , Each of these pointers points to a containing 4 individual int Array of type elements 

To understand the above statement , The key is to understand * 【】 （） The priority of the . Remember ,（）【】 The priority of is the same as and greater than that of , also （）【 The combination direction of is from left to right .

Next, let's analyze one by one ：
1.int board 【8】【8】 ;
By priority ,board With the first 【8】 combination , This is an array , And again 【8】 combination , This is an array of arrays , It's a two-dimensional array .

2.int ** ptr;
By priority ,ptr First combine with the asterisk , Indicates that this is a pointer , Combined with the asterisk, it shows that this is a pointer to the pointer , That's the second level pointer .

3.int * risks[10];
By priority ,ricks With the first 【10】 combination , So this is an array , Then combine with the asterisk , Explain that the elements in the array are pointer variables . That is to say Pointer array

4.int (* rusks)[10];
By priority ,rusks First combine with the asterisk , Indicates that this is a pointer , And again 【10】 combination , This is a pointer to an array , That is to say Array pointer

5.int * oof[3] [4];
By priority ,oof With the first 【3】 combination , This is an array , And again 【4】 The combination shows that this is an array of arrays , It's a two-dimensional array , Then combine with the asterisk , Explain that each element in the two-dimensional array is a pointer variable .

6.int (* uuf)[3] [4];
By priority ,uuf First combine with the asterisk , Indicates that this is a pointer , And again 【3】 combination , This is a pointer to an array , And again 【4】 combination , Note that this is only a pointer to a two-dimensional array .

7.int (*uof[3])[4];
By priority ,uof The first and 【3】 combination , This is an array , And then combine with the asterisk , Explain that the elements in the array are pointer variables , And again 【4】 combination , Explain that each pointer points to an inclusion 4 individual int class .