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public class ex68 {
    public static void main(String args[]) {
        int x = 5;
        int m = 0;
        x += x++ + (x++ + m);
        System.out.println(x);
    }
}
A) 5          B) 10          C) 16              D)6

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public class ex54 {
    public static void main(String args[]) {
        byte a = -128;
        byte b = (byte)(a >> 128);
        System.out.println(b);
    }
}
A)0            B)127          C)-128          D)128
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1.a+=b ʵ¼Ê¾ÍÊÇa=a+b
  x += x++ + (x++ + m)¾ÍÊÇx=x+(x++)+((x++)+m)
    ËùÒÔ        x= 5+  5  +( 6  + 0 )=17
    ´ËʱxµÄÖµ£º    x=5  x=5  x=6  x=7

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