#include <stdio.h> union myUnion { int myNum; char myLetter; char myString[30]; }; int main() { union myUnion u1; u1.myNum = 1000; // Since this is the last value written to the union, myNum no longer holds 1000 - its value is now invalid u1.myLetter = 'A'; printf("myNum: %d\n", u1.myNum); // This value is no longer reliable printf("myLetter: %c\n", u1.myLetter); // Prints 'A' return 0; }