#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>

// Declare a union type called 'union Number'.  The type name is 'union Number'.
union Number {
    int    as_int;
    double as_double;
};   // <<<< SEMICOLON!!! <<<<<


// Q: What if I try to initialize both fields?
// A: Don't do that.
//
// Q: Why not?
// A: Just don't.

int main(int argc, char* argv[]) {
    printf("\nDeclare variable 'n' as 'union Number' and initialize its '.as_double'\n");
    printf("field to 654321.123456 and its '.as_int' field to 9999999.\n");

    union Number n = { .as_double = 654321.123456,
                       .as_int    = 9999999 };  // What???
                                                // I don't know why GCC tolerates this.
    printf("n.as_double == %f\n", n.as_double);
    printf("n.as_int    == %d\n", n.as_int);

    return EXIT_SUCCESS;
}
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