Understood definition of the C language structure

Structure is a structure data type, can be understood as a custom data type by a different type of data.

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Defined above the structure is defined to be on in the main.
Structure is defined format:
struct {// the name of the structure <- Structure name can not write, the write will not be unknown structure
type member name;
type member name;
...
} structure variables 1, 2 structure variables, structure variable body 3, ...;
Example:

struct nameinfo{
	char name[50];
	char phone[100];
	int num;
}；

Internal structures may be nested structure

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Definition of the structure is not created in memory, when only declared in the main will be created

Declared in the main structure: struct structure variable structure;
Example:

struct nameinfo a;

It can be used as a type struct nameinfo.

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You can also declare variables outside the main structure of.

struct nameinfo{
	char name[50];
	char phone[100];
	int num;
}a,b,c,d；

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Members of a structure variable assignment:
a structure member variable name = value;.
Example:

a.num = 100;.

If the members of the structure type is char or char * string, you must first apply for memory, to use sprintf or strcpy be assigned. If char [] is not the type of application memory, direct use sprintf or strcpy assignment.
example:

strcpy(a.name,"xiaoming");

Note: The internal structure if the nested structure, but does not create an instance of the sub-structure, the internal structure of the variable definition will be treated as a member variable parent structure.