#include <stdio.h>
#include <string.h>
 
// Define structure
struct StudentStruct {
    int id;
    float marks;
    char name[20];
};
 
// Define union
union StudentUnion {
    int id;
    float marks;
    char name[20];
};
 
int main() {
    struct StudentStruct s1;
    union StudentUnion u1;
 
    printf("Size of Structure: %lu bytes\n", sizeof(s1));
    printf("Size of Union    : %lu bytes\n\n", sizeof(u1));
 
    // Assigning values to structure members
    printf("=== Structure Example ===\n");
    s1.id = 101;
    s1.marks = 89.5;
    strcpy(s1.name, "Riya");
 
    printf("Structure data:\n");
    printf("ID    : %d\n", s1.id);
    printf("Marks : %.2f\n", s1.marks);
    printf("Name  : %s\n\n", s1.name);
 
    // Assigning values to union members
    printf("=== Union Example ===\n");
    u1.id = 101;
    printf("After assigning ID:\n");
    printf("ID    : %d\n", u1.id);
 
    u1.marks = 89.5;
    printf("\nAfter assigning Marks:\n");
    printf("Marks : %.2f\n", u1.marks);
    printf("ID    : %d (overwritten)\n", u1.id);
 
    strcpy(u1.name, "Riya");
    printf("\nAfter assigning Name:\n");
    printf("Name  : %s\n", u1.name);
    printf("ID    : %d (corrupted)\n", u1.id);
    printf("Marks : %.2f (corrupted)\n", u1.marks);
 
    return 0;
}