Thread: sizeof struct

I'm running the following prog :

Code:

#include <stdio.h>


struct customer {
      short number;      //   1:
      int postcode;       //   2:
};

int main() {
    printf("%d\n",sizeof(customer));
}

If I run it with line 1 in comments the output is 4.OK for that.
If I run it with line 2 in comments the output is 2.OK for that too.
But if i run as it is above the outout is 8.Why is that?

Thank you in advance.