结构体定义 typedef struct 用法详解和用法小结（Structure definition, typedef struct usage detail and Usage Summary）.docVIP

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结构体定义 typedef struct 用法详解和用法小结（Structure definition, typedef struct usage detail and Usage Summary）.doc

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结构体定义 typedef struct 用法详解和用法小结（Structure definition, typedef struct usage detail and Usage Summary） Structure definition, typedef struct usage detail and Usage Summary Typedef is the meaning of type definition. Typedef struct is convenient to use this structure. Specific differences lie in: If struct node {} so defined structure of words. This is what you need to write when you apply for the node, struct, node, n; If you use typedef, you can write this, typedef, struct, node{}NODE;. You can write this when you apply for the variable, NODE, n; The difference is whether the keyword struct can be omitted from use. Third: struct and typedef struct Tell it in three pieces: 1 first: Define a structure type in C, use typedef: Typedef struct Student { Int a; }Stu; Thus, when you declare variables, you can: Stu stu1; If there is no typedef, you must declare with struct Student stu1 The Stu here is actually an alias for struct Student. In addition, you can also write Student (so you cant struct Student stu1) Typedef struct { Int a; }Stu; But in c++, its simple, direct Struct Student { Int a; }; Thus, the struct type Student is defined, and the Student stu2 is declared directly when declaring variables; =========================================== 2 secondly: In c++, it can make a difference if you use typedef: Struct Student { Int a; }stu1; //stu1 is a variable Typedef struct Student2 { Int a; }stu2; //stu2 is a struct type You can access stu1.a directly when using it But stu2 must first stu2 s2; Then s2.a=10; =========================================== 3 its OK to have two of them, but in the end, were going to talk about a problem that doesnt matter much If in the C program, we write: Typedef struct { Int num; Int age; }aaa, BBB, ccc; Whats that? My personal observer compiler (VC6) understands that this is equivalent to Typedef struct { Int num; Int age; }aaa; Typedef AAA bbb; Typedef AAA ccc; That is, AAA, BBB, CCC, and are all struct types. You can use any of these variabl