如何在汇编中将正数转换为负数 [英] How to convert a positive number to negative in assembly

问题描述

我想在汇编中将正数转换为负数， 我需要一个代码示例

I want to convert a positive number to negative in assembly, I need a code sample

输入为十六进制双字

谢谢

推荐答案

嗯，有两种方法可以做到这一点，最好是将数字加载到寄存器中，然后像汉斯所说的那样使用NEG指令，即:NEG EAX将否定eax.另一种方法是XOR EAX,EAX SUB EAX,EDX，其中edx包含您要取反的数字

Well, there are two ways to do this, best would be to load the number into a register, then use the NEG instruction as Hans mention, ie: NEG EAX would negate eax. The other way would be XOR EAX,EAX SUB EAX,EDX where edx contains the number you want to negate

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