Difference between struct and union
suggest changeThis 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; }
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