how to accept input with a large (multi-digit) number

Question

How to accept input with a large number then compare it for example

mov ah,01h
int 21h

i want to accept more than one characters and move

Answer 1

To input a 2-digit number you simply repeat the input for 1 character 2 times and combine the results:

mov ah, 01h
int 21h
sub al, '0'
mov bl, al     ;1st digits "tens"
mov ah, 01h
int 21h
sub al, '0'    ;2nd digit "units"
xchg al, bl
mov ah, 10
mul ah
add al,bl

Here AL will hold your number 32 if the first input was character "3" and the second input was character "2".

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Without re-initializing the CX register, your Z-loop will iterate 65536 times because at the end of the X-loop the CX register will be 0! Is this intentional?