Nested Structure in C

In C programming language, a structure is a composite data type that groups together variables of different data types under a single name. A nested structure is a structure that has another structure as one of its members.

Example:
Here’s an example of a nested structure in C:

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

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

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

int main() {
    struct student s1;

    strcpy(s1.name, "John Smith");
    s1.roll_number = 101;
    s1.date_of_birth.day = 15;
    s1.date_of_birth.month = 8;
    s1.date_of_birth.year = 1995;

    printf("Name: %s\n", s1.name);
    printf("Roll number: %d\n", s1.roll_number);
    printf("Date of birth: %d/%d/%d\n", s1.date_of_birth.day, s1.date_of_birth.month, s1.date_of_birth.year);

    return 0;
}

In this example, we define two structures: date and student. The date structure has three members: day, month, and year, all of type int. The student structure has three members: name, of type char array, roll_number, of type int, and date_of_birth, of type date.

We then declare a variable s1 of type student, and initialize its members using dot notation. Finally, we print the values of the structure members using printf statements.

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