#include <stdio.h> // Define structure and union with same members struct MyStruct { int a; float b; char c; }; union MyUnion { int a; float b; char c; }; int main() { struct MyStruct s; union MyUnion u; // Print sizes printf("Size of structure = %lu bytesn", sizeof(s)); printf("Size of union = %lu bytesn", sizeof(u)); // Set one member of the union u.a = 100; // Read other members printf("nUnion after setting a=100:n"); printf("u.a = %dn", u.a); printf("u.b = %fn", u.b); // reading float after int printf("u.c = %dn", u.c); // reading char after int return 0; }