In C, we usually use left shift and right shift operation << and >> to operate multiple / divide to variable with power of 2,ex: 4<<2 = 16
But when we use the signed variable and the shift operation we must consider the singed bit.See the below example code.
Since the C language support the arithmetic left shift and logic right shift, we must consider the signed bit to avoid some bug in code.
Ref:
1.Logical Vs. Arithmetic Shift
2.C语言中的逻辑右移和算术左移
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