TITLE Add 2 Numbers Program
INCLUDE Irvine16.inc
.data
entNum1 BYTE 0ah,0ah,0dh,"Enter 1st number (1-7): "
entNum2 BYTE 0ah,0ah,0dh,"Enter 2nd number (1-7): "
sumStr BYTE 0ah,0ah,0dh,"Sum in hex = "
num1 BYTE ?
num2 BYTE ?
.code
main PROC
mov ax,@data
mov ds,ax
again:
number1:
mov ah,40h ;prompt user for 1st number
mov bx,1 ;
mov cx,SIZEOF entNum1 ;
mov dx,OFFSET entNum1 ;
int 21h ;
mov ah,1 ;read 1st number from standard input
int 21h ;
mov num1,al ;
sub num1,30h ;prepare number for bound check
cmp num1,0h ;bound check for 1st number
jg L1 ;
jmp number1 ;
L1: ;
cmp num1,8h ;
jl number2 ;
jmp number1 ;
number2:
mov ah,40h ;prompt user for 2nd number
mov bx,1 ;
mov cx,SIZEOF entNum2 ;
mov dx,OFFSET entNum2 ;
int 21h ;
mov ah,1 ;read 2nd number from standard input
int 21h ;
mov num2,al ;
sub num2,30h ;prepare number for bound check
cmp num2,0h ;bound check for 2nd number
jg L2 ;
jmp number2 ;
L2: ;
cmp num2,8h ;
jl addNumbers ;
jmp number2 ;
addNumbers:
mov ah,40h ;prints message
mov bx,1 ;
mov cx,SIZEOF sumStr ;
mov dx,OFFSET sumStr ;
int 21h ;
mov al,num1 ;prepare number for printing
add al,num2 ;
add al,30h ;
cmp al,39h ;
jbe over ;
add al,7h ;
over: ;print hex sum
mov ah,6 ;
mov dl,al ;
int 21h ;
loop again
exit
main ENDP
END main
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