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 32 33 34 35 36 37 38 | #include <stdio.h>
#include <stdlib.h>
typedef union { // shares the same space in memory for *ONE* of the fields
int as_int; // 4 bytes (on our platform)
char* as_string; // 8 bytes (" " " )
float as_float; // 4 bytes (" " " )
// WHOLE: 8 bytes (max of 4, 8 ,4)
} Element;
typedef enum { ELEMENT_INT, ELEMENT_STRING, ELEMENT_FLOAT } ElementType;
// const int ELEMENT_INT = 1, ELEMENT_STRING = 2, ELEMENT_FLOAT = 3;
void print_element(Element element, ElementType element_type) {
if(element_type == ELEMENT_INT) {
printf("element.as_int == %d\n", element.as_int);
}
else if(element_type == ELEMENT_FLOAT) {
printf("element.as_float == %f\n", element.as_float);
}
else if(element_type == ELEMENT_STRING) {
printf("element.as_string == %s\n", element.as_string);
}
else {
assert(false); // unexpected element_type
}
}
int main(int argc, char* argv[]) {
Element element = { .as_int = 5 };
ElementType element_type = ELEMENT_INT;
//printf("element.as_float == %f\n", element.as_float);
//printf("element.as_string == %s\n", element.as_string);
printf("element.as_int == %d\n", element.as_int);
return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */
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