🚀 go-pugleaf

Hi John,

>                I am trying to teach myself some assembly language at the
>moment and I have been set a problem.  I am using Netwide assembler for
>intel x86's.  The problem I have been given is to subtract two numbers
>between 0-99 and display the answer.  If you can help me solve this problem
>then reply pronto.

Be aware that this is not a 'simple problem'. Converting string
representations of values (in decimal notation) and vice-versa is a small
program on it's own. Why don't you start with a program that just translates
the value of a register (i.e. AX) into it's decimal representation as a
string. Once you have that, you'll have most of your solution, since
substracting values between 0 and 99 (or -32000 to +32000) is not taking
more than:

    SUB AX,BX

(and for larger numbers working in 16-bit mode, you'll just need to know how
flag bits are modified by the SUB instruction and how to handle with this.)

Kind regards

Rudi Breedenraedt


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