C + + composite data structure types

A struct struct:

struct Name {
Type var1;
Type var2;
....
} ;

A data structure that combines several basic types of structures to form.

Initialization method:
struct name var_name = {Value_list};

Two common body Union:

Union name {
Type var1;
Type var2;
....
};

All data structure types in a common body use the same address, which is typically combined with structs.

struct Name {
Type var1;
Type var2;
Union {
Type VAR3;
Type VAR4;
};
};

This creates an anonymous consortium.

Three enum types:
Enum name {var_list};
The first variable in the enumeration type is assigned a value of 0, and the subsequent value of the variable is added in turn

Other implementations of the four array types:

Apart from the traditional method of declaring arrays in C, there are two other ways in C + + that have the same effect.

(1) Use <vector> header file

                vector<typename> vt (n_elem) ;                如果说 size为0 ， 那么后面的小括号部分可以抛弃。(2)   使用<array> 头文件                array<typename,n_elem> ai = { value_list };                其中的array可以在两者之间直接赋值，即                array_a    =    array_b ;

C + + composite data structure types