将结构用于其他结构c

Question

I have a problem using a struct in the C language.
It is very strange !!!
I cant use course struct in student struct.
I have defined it before but ... why?

struct course
{
    int no;
    char name[30];
    int credits;
    float score;
};

struct student   
{
int no;
char name[50];
course c[3];
};

My language is c not c++

Answer 1

One of the differences between C++ and C is that you can omit type keywords such as class and struct when using C++ types.

The problem is the line course c[3]; . In order to make it work, you have two choices--you can use a typedef on your struct course :

typedef struct _course  // added an _ here; or we could omit _course entirely.
{
    int no;
    char name[30];
    int credits;
    float score;
} course;

or you can add the keyword struct in front of the broken line, ie struct course c[3]; .

Answer 2

You need to prefix the struct name with the struct keyword:

struct course
{
    int no;
    char name[30];
    int credits;
    float score;
};

struct student   
{
    int no;
    char name[50];
    struct course c[3];
};

Answer 3

struct course c[3]; 

应该管用...

Answer 4

struct student {
    /* ... */
    struct course c[3];
}

or

typedef struct _course {
    /* ... */
} course;

struct student {
    /* ... */
    course c[3];
}

Answer 5

You should actually be able to define an anonymous struct and then typedef it, so:

typedef struct {
    /* stuff */
} course;

and then as the others have said,

struct student {
    course c[3];
}

Answer 6

typedefs are helpful, because they allow you to shorten declarations, so you are not always having to type the word struct .

Here is an example involving typedef-ing your structs. It also includes a course struct in the student struct.

#include <stdio.h>
#include <string.h>

typedef struct course_s
{
    int no;
    char name[30];
    int credits;
    float score;
} course;

typedef struct student_s   
{
int no;
char name[50];
course c[3];
} student;

bool isNonZero(const int x);

int main(int argc, char *argv[])
{
    int rc = 0;

    student my_student;
    my_student.c[0].no = 1;

    return rc;
}