#include <stdio.h>
int main()
{
int x = 10 ,y =20;
int z = 0;
z = (++x) + (y++);
printf("z = %d\n",z);
z = (--x) + (y++);
printf("z = %d\n",z);
z= (++x) + (--y);
printf("z = %d\n",z);
printf("x = %d y = %d\n",x,y);
return 0;
}