看几个例子：
short a =0xa400;
long nShift = 2;
if(a <<nShift <0)
nShift = 0;
short a =0xa400;
long nShift = 2;
long b = a<<nShift;
short a =0xa400;
long nShift = 2;
short c = a<<nShift;
short a =0xa400;
long nShift = 2;
b = a&0x80000000;
if(b>0)
nShift = 1;
short a =0xa400; long nShift = 2; if(a <<nShift <0) nShift = 0;上面的程序中，nShift等于多少？
short a =0xa400; long nShift = 2; long b = a<<nShift;上面程序的b最后值是多少？
short a =0xa400; long nShift = 2; short c = a<<nShift;上面程序中的c是什么值？
short a =0xa400; long nShift = 2; b = a&0x80000000; if(b>0) nShift = 1;上面程序中nShift的值是多少？
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