如何将联合与两个结构一起使用 + 更多

Question

我的作业遇到了问题，希望得到一些帮助。

我假设有两个结构，volunteer 和 employee，以及一个 union 'person'，它将名字、姓氏、电话号码 + volunteer 或 employee 作为一个结构。

我以前有过使用联合+结构的经验，但我想在联合中有更多的信息。我想知道如何正确设置它，这就是我目前所拥有的。

typedef struct volunteer{
    int hours;
    int tasksCompleted;
}student;

typedef struct employee{
    float salary;
    int serviceYears;
    int level;
}employee;

typedef union person{
    char firstName[20];
    char familyName[20];
    char telephoneNum[10];
    //employee e;
    //volunteer;
}person;

任何帮助都会很棒。这是我坚持的任务说明。

Create a person record that consists of the common records: first name, family name and telephone and a union between the volunteer and employee record. Make sure that you add a field to discriminate between the two records types employee or volunteer.

Answer 1

我认为你想多了：你需要一个结构来代表人。关键部分是

"and a union between the volunteer and employee record."

typedef enum { employee_person, volunteer_person }  person_type;
typedef struct person{
    char firstName[20];
    char familyName[20];
    char telephoneNum[10];
    person_type type;
    union {
        struct employee employee;
        struct volunteer volunteer;
    };
}person;

Answer 2

这应该可以满足您的要求：

typedef struct volunteer {
    int hours;
    int tasksCompleted;
} student;

typedef struct employee {
    float salary;
    int serviceYears;
    int level;
} employee;

struct person {
    char firstName[20];
    char familyName[20];
    char telephoneNum[10]; 
    bool is_employee;
    union {
        employee e;
        student s;
    } info;
} person;

如何将联合与两个结构一起使用 + 更多

How to use a union along with two structs + more

c

struct

unions