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#define lshft(A,n) ((A)<<(n))
#define lshft_1(A) ((A)<<1)#define lshft_2(A) ((A)<<2)
这个定义怎么理解？
这几个是宏定义函数，lshft(A,n)是函数名，((A)<<(n))是函数体。
