Advice for my system

**qwertysingh** · 02-16-2009

Hi guys, thanks for your previous replies to my thread, I now have a system that satisfies my 1st iteration. It does what it is supposed to do, it allows the user to test individual logic gates, through user specified inputs to see what the output will be.

Looking at the code(Please see the attachment) I know that I will be able to tidy it up and make it more elegant. But what I need advice on now is how do I get the system to allow the user to test multiple gates at the same time.

To clarify I want my 2nd iteration to be able to allow the user the select the gate they want, specify how many inputs and then specify the values for those inputs. Then allow the user to select another, or ever how many the user would like, setting up in the same way; inputs and the values for the inputs.

Here lies the problem, I need to specify a run function that can be accessed by the user from the menu, so when they execute it the corresponding switch statement runs the function and the then the output for each of the gates selected will be displayed in the command prompt.

Now I realise that depending on how many gates the user selects may make it hard to keep track of what gate is producing what output, so I need a way of incrementing an ID number fro each gate. I hope that all make sense, any feedback will be great.

Thanks again, and thanks for before.

Archie

**matsp** · 02-16-2009

A lot of code is repeated - for example the input of the "input array", asking how many inputs are wanted. Use functions to avoid repeating code.

In several places, you do some input, then have a while-loop in case the input was wrong. Using do-while instead of while (or initializing the variable in question to an invalid value) allows you to only write the code to ask the question ONCE.

Code:

	if (result == 1){
		printf("\nOutput = 0\n");
	}
	else {
		printf("\nOutput = 1\n");
	}

Could be written in a single line, using printf with %d format.

I'm sure I could find more, but

--
Mats

**qwertysingh** · 02-17-2009

H,. thanks.

Even though I am still quite new to C (doing it all again), I can see where I can simplify the code further. For me to incororate a run function so that the user can input multiple gates into the system, how would I go about that? That is what I am stuck on

Archie

**matsp** · 02-17-2009

Originally Posted by qwertysingh

H,. thanks.

Even though I am still quite new to C (doing it all again), I can see where I can simplify the code further. For me to incororate a run function so that the user can input multiple gates into the system, how would I go about that? That is what I am stuck on

Archie

There are probably several ways to do that, but you most likely will have to build some form of tree data-structure, where each operator has a link to the next operator that it feeds into. You would also have to mark what operation each operand actually is.

This is not entirely trivial work.

--
Mats

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