int x = 10;
int y = 20;
int z = (++x) + (y--);
System.out.println(z);
System.out.println("------------");
System.out.println(x);
System.out.println(y);
System.out.println(z);
System.out.println("------------");
System.out.println(x);
System.out.println(y);
System.out.println(z);
31
------------
11
19
31
------------
11
19
31
마지막 xy값이 왜 12, 18로 안바뀌고 11 19 그대로 유지되는거야??
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