Why is the size of the memory of the struct variable 'place' is 16 Bytes?

Question

Code:
#include <stdio.h>
struct residence{
char city[10];//10
int plz;//4
};
struct address{
char street[20];//20
int housenr;//4
struct residence place;
};
int main() {
struct residence place;
printf("%d Bytes ",sizeof(place));
return 0;
}

Answer 1

every thing is explained here
https://www.google.com/amp/s/www.geeksforgeeks.org/is-sizeof-for-a-struct-equal-to-the-sum-of-sizeof-of-each-member/amp/

Answer 2

memory is arranged as a group of 8 byte on a 64 bits machine and 4 on a 32 bits machine this allows an increase in processing speed

Answer 3

thanks ~ swim ~ but what about the array of size 10 with???

Answer 4

thanks alot ~ swim ~

Answer 5

but why is it like that and not in the actual pack of 4??? ~ swim ~