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" " , union. " " , .

 

struct ExamStruct { long L; int K[2]; char C[4]; } STR;   union ExamUnion { long L; int K[2]; char C[4]; } UNI;  
sizeof(ExamStruct) = 12 sizeof(ExamUnion) = 4
:     L, K[2], C[4]       L, K[2], C[4] .

 

 

, , . . , , . , , UNI .

( ), UNI.C[1] L .

, . define, . define STAFF struct sStaffType. , .

#define STAFF struct sStaffType

STAFF { // -

int iYearsOfService; // ()

float fHourlyWage; //

};

# define STUDENT struct sStudentType

STUDENT{

float fGradePtAverage; //

int iLevel; //

};

# define PROFESSOR struct sProfType

PROFESSOR {

int iDepartmentNumber; //

float fAnnualSalary; //

};

# define NODE_TYPE enum eNodeType

typedef NODE_TYPE {student, professor, staff};

# define TREE struct sTree

TREE {

char sLastName[15]; //

char sFirstName[15]; //

int iAge; //

TREE *Left, *Right; // ()

NODE_TYPE tag; // -

union {

STUDENT student;

PROFESSOR professor;

STAFF staff;

} uNodeTag; // ,

}; //

 

, TREE, uNodeTag, STUDENT, PROFESSOR, STAFF. , TREE , , , , . , - , . , uNodeTag tag. , , , , , , . ( tag, , , , ..) TREE , , .

uNodeTag TREE:

union {

STUDENT student;

PROFESSOR professor;

STAFF staff;

} uNodeTag;

 

uNodeTag TREE, TREE. TREE . , uNodeTag. Windows.

 

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1. , ;

2. ( ) m0 1, , m , ; 1, , m .

, , .

 

 

     
 

 


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) (A (B (H) (J)) (C (D) (E(G)) (F)))

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. -. : ; ; . y=3ln(x+1) a/x2 .

. , . : ; ; .

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