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

Define a structure
struct Student {
	int id;
	float marks;
	char grade;
};

// Define a union
union Data {
	int intValue;
	float floatValue;
	char str[10];
};

int main() {
	// Structure example
	struct Student s1 = {101, 95.5, 'A'};

	printf("=== Structure Example ===\n");
	printf("ID: %d\n", s1.id);
	printf("Marks: %.2f\n", s1.marks);
	printf("Grade: %c\n", s1.grade);
	printf("Size of structure = %zu bytes\n\n", sizeof(s1));

	// Union example
	union Data d1;

	printf("=== Union Example ===\n");

	d1.intValue = 25;
	printf("After assigning intValue:\n");
	printf("intValue = %d\n", d1.intValue);

	d1.floatValue = 12.5;
	printf("\nAfter assigning floatValue:\n");
	printf("floatValue = %.2f\n", d1.floatValue);
	printf("intValue (overwritten) = %d\n", d1.intValue);  // overwritten

	strcpy(d1.str, "Hello");
	printf("\nAfter assigning str:\n");
	printf("str = %s\n", d1.str);
	printf("floatValue (overwritten) = %.2f\n", d1.floatValue); // corrupted
	printf("Size of union = %zu bytes\n", sizeof(d1));

	return 0;
}