2014.12.9 Afternoon C Language Review

Afternoon saw the structure, enumeration type, TypeDef, and finally I have not understood the things are understood, happy

Structs are similar to classes in object-oriented, but there is no way to think of different data types as a whole

An enumeration type is a link between a nonnegative integer and a string constant, such as an enum season {spring,summer,autumn,winter} s; s = Spring (equivalent to S = 0)

typedef is very important, the commonly used notation is typedef type name

It is particularly important to note the notation of struct pointers and function pointers.

typedef struct {int x;inty;} *p,point;

typedef int (*P) (int,int); You can call the original function directly with *p (Int,int)

Note that the essence of declaring pointer variables is to declare the type of address of the same variable, *p itself is not a type, just take that address worth

If the definition initialized is a constant like char *s = ""

2014.12.9 Afternoon C Language Review