Converting number into displayable strings...

[HaxSoft]

Well, you'd have to write a routine to do that. For example, if you have decimal 7 in Abc, you could simply print character 48 (decimal) + Abc IF Abc plus 48 is less than or equal to 57 (the "9" character).

If it's greater, then you have to 'mod' it to find out what the least significant digit should be and work your way up until you have all the right digits.

Hope this makes sense; it's a little hard to explain.

[jian2587]

Yes, I've this kind of idea at first...
But dont know how should I code it...
Is it kinda like recursive procedure?

If it's binary to hex string...
That'll be more easy by splitting the high and low nibble
then using XLAT to translate it...

But this is decimal...

[transcendental]

This is something every assembly programmer should have been done before when they want to display a number.

I have done a module in x86 assembly 5 years ago so I don't remember the instructions set now.

But I can roughly tell you the steps and logic of how I did it.(for numbers only, not floating point numbers).

eg,

1234

1234/10000, get the result = 0 store nA.
if not 0, subtract the result from the number.

1234/1000, get the results = 1 store nB.
if not 0, subtract the result from the number.

234/100, get the result and store nC.
if result not 0, subtract the result from the number.

34/10, get the result and store in nD.
if not 0, subtract the result from the number.

4/10, get the remainder and store in nE

Run a loop to check nA,nB,nC, is 0.

Upon hitting the first non zero, break out of loop and start to prepare for display.

Prepare for display: add 48 to the numbers, eg(1 add to 48 will be 1 in ascii), do some logic yourself to avoid displaying the leading zeros by adding a tag or something like that, up to you.

Now can display, also do some coding for merging the numbers with the string you want to display together.

The above is for 16 bit number and 16bit number max is 65535(5 numbers max, that's y you got to divide by 10000 first)

The logic for 32 bit is the same, divide by 1000 000 000.

Assembly programming is very tedious and long.

There is little rewards in writing such a routine. IMO only

It is better to combine your assembly skills with higher level language to get the performance you want if necessary.(Don't use asssembly unnecessary. also IMO only.

[jian2587]

Uh, thanx, ur algorithm seems to take up lots of resources...
Lots of divide

I am making a BASIC to ASM converter...
But not the usual one,
this BASIC is concentrating on creating system apps or OS...
so I've to keep on minimizing and speeding up the codes...

I am making the assembly codes for the Val & Str
functions.

So, impossible to combine with high level lang...

Anyway, while making this BASIC, is there anyway to avoid
pushing registers while executing a code?
For example...
There's a loop, CX has the counter...
While in the loop, I am running a display string code...
Where it uses CX register...
And thus I've to push those registers...
This is really tedious...

[transcendental]

Originally posted by jian2587

There's a loop, CX has the counter...
While in the loop, I am running a display string code...
Where it uses CX register...
And thus I've to push those registers...
This is really tedious...

I think you have to push or try to freed and use some other register like AX ,as Intel CPU is really lack of registers which programmer could use.

Assembly programming is tedious, as I told you. It is not as straightforward as other higher languages where you call other people's code most of the time.

[jian2587]

*Lol*
PUSHA and POPA

[DaoK]

You will need to move the hexa number to the ascii number with SHL and SHR.

Example:
If you want to print the number 19 you will need to split the 1 and the 9 in 2
1)
[0][0][1][9] should be [0][1][0][9]

2) After you will need to increment of 20 both to have the ascii number

[2][1][2][9]

3)after you print seperatly both and here you are.

[jian2587]

Pls explain more...

[DaoK]

How can I explain it more than that ?

[jian2587]

How about writing the asm code for it?
I'll figure it myself