Need help with reading integers from the keyboard

[matthius]

Has anyone out there got some sample code for reading in numbers (in ASCII) and converting these to actual numbers to be used in calculations?

I amd using TASM and I need to get the user to enter in 2 32bit numbers and then I will add them. I know the code for reading in from the keyboard (ie. mov al, o1h int 21h) but I do not know what to do then to convert them into numbers which I can use. If you have any example source code it would be appreciated.

 

[Thazager]

Im presuming you know the amount of digits the person entered. Hope this routine works, I wrote it on the fly, didnt have one avail.

mov ebx,LenofInval ;get amount of chars entered
mov ecx,1 ;init our mutliplier
mov newval,0 ;value to be stored here
@loop
mov eax, inval[bx] ;get digit - start at lowest(last)
cmp eax, 30h ;check for good value to convert
jl toolow ; error - not a number
cmp eax, 39h
jg toohigh ; error - not a number

sub eax,30h ;get value
mul ecx ;get digit offset value
add newval,eax ;our new value
mov eax,10 ;next digit multi
mul ecx
mov ecx, eax ;save it
dec ebx ;next offset
jnz @loop
;value in newval is number



Thaz