访问嵌套体中内部结构的元素

Question

Can we not access the elements of inner structure?(which is dept in this case).

When i try to initialize the value of dept structure, i get errors mentioned in the last.

#include <stdio.h>
#include <string.h>
struct employe
{
    char name[10];
    int i;
    struct dept
    {
        char name[10];
        int uniq_num;
    }d;
}e;
int main()
{
strcpy(d.name, "CS");
strcpy(e.d.name, "Computer Science");
printf("The dept name: %s \n", d.name);
printf("Employee dept name: %s \n", e.d.name);
getchar();
return 0;
}

Errors -

"example9.c", line 18: undefined symbol: d
"example9.c", line 18: warning: left operand of "." must be struct/union object
"example9.c", line 18: cannot access member of non-struct/union object
"example9.c", line 20: warning: left operand of "." must be struct/union object
"example9.c", line 20: cannot access member of non-struct/union object

Answer 1

You have (by mistake?) used d.name instead of e.name in eg the first strcpy call.

You use the correct syntax to access the nested structure in one strcpy and printf call, when you do edname .

Answer 2

As I mentioned, You cannot access inner elements without using object/pointer of/to structure. just like to access name variable, you have to use e.name, similarly to access d variable, you must have to use ed

Answer 3

It's better to define the structures separately:

struct dept
{
    char name[10];
    int uniq_num;
};

struct employe
{
    char name[10];
    int i;
    struct dept d;
}e;

and then you can access the d members of e structure with edname, eduniq_num.