What is the difference between structure and union in C?

Structure	Union
Each member has separate memory	All members share the same memory
Size is the sum of members (plus padding)	Size is the size of the biggest member
All members hold values together	Only one member holds a valid value

#include <stdio.h>

struct S { int i; double d; };
union  U { int i; double d; };

int main(void) {
    printf("%zu %zu\n", sizeof(struct S), sizeof(union U));
    return 0;
}

Output:

See Structures and Union.

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