在汇编程序x86中进行划分 [英] Dividing in Assembler x86

问题描述

我的大学给我做运动:

1.在Jasmin中创建一个新文档

2.使用AL寄存器将9加上8.

3.减2.

4.除以7.

我的解决方法是:

mov al,9
add al,8
sub al,2

但是我如何除以7?我尝试了类似div al,7的方法，但这没用.

But how do I divide by 7? I tried something like div al,7 but that doesn't work.

推荐答案

div操作将AX，DX:AX或EDX:EAX寄存器中的值(除数)除以源操作数(除数)并将结果存储在AX(AH:AL)，DX:AX或EDX:EAX寄存器中.

div operation divides (unsigned) the value in the AX, DX:AX, or EDX:EAX registers (dividend) by the source operand (divisor) and stores the result in the AX (AH:AL), DX:AX, or EDX:EAX registers.

源

因此，要将值除以al，您需要执行以下操作:

so, to divide value in al, you need to do:

mov ah, 0 # clean up ah, also you can do it before, like move ax, 9
mov bl, 7 # prepare divisor
div bl # al = ax / bl, ah = ax % bl

之后，al将包含商，而ah将包含余数

after that al will contain quotient and ah will contain remainder

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