Data structure and algorithm analysis--Introduction to abstract data types (2)

1. Give a new name to an already existing type, thus creating a new type: typedef oldtype Newtpye;

2, Emum Color{red,orange,yellow,green,blue}; where Color is called an enumeration type, {} is called an enumeration constant

By default, the associative integers of enumerated constants start with 0, this example is 0~4, or can be set to

Emum color{red = 1,orange,yellow,green,blue}; The associated numbers of the new examples are the ";

Emum color{red = 2,orange = 4,yellow = 6,green = 8,blue = 10}; (PS: The output of an enumeration constant is the output of its associated number)

3, pointer variable is a variable, its value is a memory address.

4, the use of new:

int *intptr = new int;

After being executed, new int submits a request to the operating system requiring a piece of memory that is sufficient to hold an integer value (that is, a memory that requires sizeof (int) bytes), and if the operating system satisfies this requirement, the IntPtr will be given the address of the memory location.

5, the pointer is the address of the memory location, the location can only hold the value of that type.

Data structure and algorithm analysis--Introduction to abstract data types (2)