1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 | #include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>
#include "log_macros.h"
union Value {
int as_int;
char* as_string;
};
// A union object can contain only one of the fields; they share the same space.
void print_element(Value the_value) {
if(…) { // We cannot know what type the_value is without another parameter.
printf("the_value is %d\n", the_value.as_int);
}
else {
printf("the_value is %s\n", the_value.as_string);
}
}
int main(int argc, char* argv[]) {
union Value v = { .as_int = 5 };
enum ValueType v_type = TYPE_INT;
v.as_int = 7;
v.as_string = "apple";
return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */
|
© Copyright 2023 Alexander J. Quinn This content is protected and may not be shared, uploaded, or distributed.