Thread: why the result of print statement for a.x isn''t 1?

why the result of print statement for a.x isn''t 1?

Code:

#include<stdio.h>

union u{ int x; char y;}a;
int main ()
{
    a.x = 1;
    a.y = 'A';  
    printf ("%d ", a.x);
    printf ("%c ", a.y);
    
    printf ("\n %d ", sizeof(a.x));
    printf ("\n %d ", sizeof(a.y));
    return 0;
}

result

65 A
4
1

65 A
4
1