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编程中用移位运算替代乘除法会不会有问题？
source link: https://www.v2ex.com/t/469591
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程序员 - @jssyxzy - 因为移位运算实际上有算术移位，逻辑移位，循环移位； 又有有符号数，无符号数； 不同编程语言有可能实现不同。 请问这里面有没有什么坑？
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