C language complex type description

We often encounter some complicated pointer type descriptions , Many beginners may feel a little confused , In fact, according to a rule to analyze , It is not difficult at all

The laws of ： Start with the variable name , According to the priority of combination , Step by step to analyze

explain ：1、[] Is greater than *

            2、（） The priority of is greater than that of the pointer

principle ：1、 The pointer and A combination , The content pointed to is A

             2、 An array with the A combination , Then the data type of each element in the array is A

             3、 The standard form of the function is ： Function return value type   Function name （ parameter list ）

int p  // This is a normal integer variable

int *p    // This is a pointer , The content pointed to by the pointer is integer data

int p[3]   // This is a normal array , Yes 3 Elements , The data of each element is an integer

int *p[3]    //p Precede [] combination , This is an array , There are 3 Elements , And again * combination , Indicates that the type of each element is a pointer , And again int combination , Indicates that each pointer points to int type

int (*p)[3]   // p The first and * combination , Description is a pointer , Then with [] combination , What the pointer points to is an array , The array has 3 Elements , And again int combination , Explain that each element is int type

int **p      // Is an ordinary two-level pointer

int p(int )  // An ordinary function p, The return value is int type , The parameter of the function is int type

int （*p）(int)   //*p It's a pointer , And again （） combination , The pointer points to a function , Look again （） Medium int , Description: the function parameter is int type , Combine the leftmost int, The return value of the function is also int type

int *（*p(int)）[3]   //  p The first and （） combination , explain p It's a function , The function parameter is int type , And again * combination , The return value of this function is a pointer , Follow again [] combination , The pointer refers to an array , The array has 3 Yuan                                  // plain , And again * combination , The type of each element is a pointer , Then each pointer points to int type .