C Language Unions Difference between struct and union
Example
This illustrates that union members shares memory and that struct members does not share memory.
#include <stdio.h>
#include <string.h>
union My_Union
{
int variable_1;
int variable_2;
};
struct My_Struct
{
int variable_1;
int variable_2;
};
int main (void)
{
union My_Union u;
struct My_Struct s;
u.variable_1 = 1;
u.variable_2 = 2;
s.variable_1 = 1;
s.variable_2 = 2;
printf ("u.variable_1: %i\n", u.variable_1);
printf ("u.variable_2: %i\n", u.variable_2);
printf ("s.variable_1: %i\n", s.variable_1);
printf ("s.variable_2: %i\n", s.variable_2);
printf ("sizeof (union My_Union): %i\n", sizeof (union My_Union));
printf ("sizeof (struct My_Struct): %i\n", sizeof (struct My_Struct));
return 0;
}
