C: Trying integers sizeof and implicit type conversion

main.c

#include <stdio.h>

typedef unsigned short ushort;

int main()
{
    printf("sizeof(sizeof)=%ld\n", sizeof(sizeof(ushort))); // 8
    printf("ushort=%ld\n", sizeof(ushort));	// 2
    printf("int =  %ld\n", sizeof(int));	// 4
    ushort a=1, b=3;
    int d = a-b;
    printf("ushort 1 - 3 = %d\n", d);		// -2
    d = b-a;
    printf("ushort 3 - 1 = %d\n", d);		// 2
    printf("sizeof(ushort 1 - 3) = %ld\n", sizeof(a-b));	// 4
    printf("sizeof(ushort 1 & 3) = %ld\n", sizeof(a&b));	// 4
    return 0;
}