stuck on Little man computer help please!

trying to write a program for school. the program is supposed to do the following:


Write a program that takes an input value (for example, a number 5). The output should be sum of all numbers from 1 to the value input by the user (in this example, the output would be 1+2+3+4+5 i.e. 15)


what I dont get is how if say I enter 20 how to get it to know that I entered 20 and just add all the numbers from 1 to 20 like count. would I use the SUB (subtract) command to aid in this? help-I'm stuck!!


INP
STA NUM1
LDA NUM1
INP
STA NUM2
LDA NUM2
ADD NUM2
OUT
HLT

This is a question on assembly language, not 'C'.

sorry, I did think of that but then I saw another thread about lmc so I thought I'd try. do you know any good forums that help with this, or any good irc channels? thanks

What microprocessor is it for?

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Originally Posted by Click_here

What microprocessor is it for?

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Don't think it's a real microprocessor (though a hardware implementation may exist somewhere), probably just a hypothetical one: Little man computer - Wikipedia, the free encyclopedia.

Quote:

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Originally Posted by cduval04

what I dont get is how if say I enter 20 how to get it to know that I entered 20 and just add all the numbers from 1 to 20 like count. would I use the SUB (subtract) command to aid in this? help-I'm stuck!!

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Yes, subtraction is a good way to approach this. Could you write such a program using subtraction in a higher level language, like C, C++, Java, etc? If so, then you understand the concept. Try writing this in one of those languages, then translate the higher level code into little man assembly.