#include <stdio.h>
#include <string.h>
 
// Define a union
union Data {
    int i;
    float f;
    char str[20];
};
 
int main() {
    union Data data;
 
    printf("Memory size occupied by union: %lu bytes\n", sizeof(data));
 
    // Assign integer value
    data.i = 10;
    printf("\nAfter assigning integer:\n");
    printf("data.i = %d\n", data.i);
 
    // Assign float value
    data.f = 22.5;
    printf("\nAfter assigning float:\n");
    printf("data.i = %d\n", data.i); // overwritten
    printf("data.f = %.2f\n", data.f);
 
    // Assign string value
    strcpy(data.str, "C Programming");
    printf("\nAfter assigning string:\n");
    printf("data.i = %d\n", data.i); // overwritten
    printf("data.f = %.2f\n", data.f);
    printf("data.str = %s\n", data.str);
 
    return 0;
}