how to make a structure in c code example

Example 1: how to put a structure into a structure in c

#include 
#include 
 
struct student_college_detail
{
    int college_id;
    char college_name[50];
};
 
struct student_detail 
{
    int id;
    char name[20];
    float percentage;
    // structure within structure
    struct student_college_detail clg_data;
}stu_data;
 
int main() 
{
    struct student_detail stu_data = {1, "Raju", 90.5, 71145,
                                       "Anna University"};
    printf(" Id is: %d \n", stu_data.id);
    printf(" Name is: %s \n", stu_data.name);
    printf(" Percentage is: %f \n\n", stu_data.percentage);
 
    printf(" College Id is: %d \n", 
                    stu_data.clg_data.college_id);
    printf(" College Name is: %s \n", 
                    stu_data.clg_data.college_name);
    return 0;
}

Example 2: declare structure in c

struct num{
 int a ;
 int b;
};

int main()
{
    struct num n;
    //accessing the elements inside struct
    n.a=10;
    n.b=20;
}