Union

Question

I declared an union structur with 3 different type of datatypes. All of the members are initialized and as an output I'm getting 8 Bytes. Why I'm getting 8 Bytes?

union info
{
int a;//4Bytes
float b;//4Bytes
char c[5];//5Bytes
};

int main()
{
union info i;

i.a=4;
i.b=3.4;
strcpy(i.c,"David");

printf("Gesamtspeicherplatz: %d Bytes\n",sizeof(i));

Answer 1

When you write at int and read the float you get a broken number as output because it literally shares the same memory location, thus, float contains the int and some garbage.

Answer 2

A structs size is determined by the biggest datatype/bitfield it contains

Answer 3

This is a float that conditionally stores an int or 5 chars