/**
 * A simple example of a union and the space savings therein
 * **/

#include <stdio.h>

/**
 * A union.
 * If this were a struct, it would use 4 + 8 + 24 bytes
 * As a union, it uses the number of bytes of its largest contents
 * of 24 bytes
 * **/
typedef union {
    int uA;
    long uB;
    char aa[24];
} aUnion;


int main(int argc, char const *argv[])
{
    // put 4 instance of the untion into an array so 
    // can see the starting point of each item in memory
    aUnion a[4];
    for (int i = 0; i < 4; i++)
        printf("%d %ld\n", i, &a[i]);
    return 0;
}