在汇编语言环境下，利用汇编语言判断输入数据的正负，如果为正，则将其低两位置零；如果为负，则将其低两位置一。-In assembly language environment, the use of assembly language input data to determine the positive and negative, if positive, will be the location of its low two zero　if negative, will be the location of a low two.