Nested structures in C language

In C language, a structure can contain another structure as one of its members. This is called a nested structure.

Example:

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

struct date {
    int day;
    int month;
    int year;
};

struct student {
    char name[50];
    int roll_number;
    struct date birthdate;
};

int main() {
    struct student s1;

    strcpy(s1.name, "John");
    s1.roll_number = 1234;
    s1.birthdate.day = 15;
    s1.birthdate.month = 9;
    s1.birthdate.year = 1990;

    printf("Name: %s\n", s1.name);
    printf("Roll Number: %d\n", s1.roll_number);
    printf("Birthdate: %d/%d/%d\n", s1.birthdate.day, s1.birthdate.month, s1.birthdate.year);

    return 0;
}

Output:

Name: John
Roll Number: 1234
Birthdate: 15/9/1990

In this example, the struct student has a member birthdate of type struct date. This means that each student has a birthdate which is a structure with three members: day, month, and year. The program creates a struct student variable s1 and assigns values to its members using dot notation. It then prints out the values of s1‘s members, including the nested birthdate structure.

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