How to Add Two Binary Number in Assembly Language emu8086

Taking user input in assembly language emu8086 is little bit difficult then other language . Generally , working with machine language is difficult than any high level language. It does not give you anything smoothly . But if you can grab it once ,you will find interest using this.In assembly it is not possible to take a  number containing more than one digit at once or not possible to show a  number containing more than one digit at easily.We have to take user input one by one character and also print by one.So it is little bit difficult to process big project. Lets see a program that will take two binary numbers as user input and will show them as output, also add them and print their sum.

This program will take two binary number(each of the number should be 8 bit in maximum) from user and show the numbers as output and also show their sum. 




include 'EMU8086.INC'     ;include library 

.MODEL SMALL
.STACK 100h
.DATA   
   i DB 8        ;variable declaration 
   j DB 8
   k DB 16
   s DW ?

.CODE   
     MAIN PROC
        MOV AX,@DATA
        MOV DS,AX
        
        PRINT "Enter First Number:"
        
        XOR BX,BX                 ;set initially bx register's value to 'zero'
        XOR CX,CX                 ;set initially bx register's value to 'zero'

        
        
        MOV AH,1             ;for taking user input
        INT 21h
        
        NUM1:                  ;level for taking first input
            CMP AL,0DH          ;pressing 'enter' will end the fisrt number
            JE SECOND
            
            AND AL,0FH          ;this is for masking.it will give you the original value from ascii value
            SHL BL,1             ;left shift current value for next storing
            OR  BL,AL            ;store the value in 'BL' register
            
            INT 21h
            JMP NUM1
      
      SECOND:        
      
      PRINTN
      PRINT "Enter Second Number:"
        
      NUM2:                    ;level for taking second input

            MOV AH,1
            INT 21h
            CMP AL,0DH
            JE SUM
            
            AND AL,0FH
            SHL CL,1
            OR  CL,AL
            
            JMP NUM2    
         
      SUM:         ;now two inputs are in bx and cx register
      
      ADD s,BX    ;add bx with s and keep it in s
      ADD s,CX    ;add cx with s and keep it in s.so out sum is in 's'

       
      PRINTN
      PRINT "First Number:"
             
      NUMBER1:         ;level for print first input
            CMP i,0
            JE OUTPUT1
            
            SHL BL,1     ;it is not possible to print a whole number at once in assembly language.we should shift one bit in left and the value will be store in carry flag.thus we will print the total number
            JC P1        ;check if the carry flag value is equal to 1 
            JNC P0       ;check if the carry flag value is equal to 0

      P1:                 ;level for print 1
         MOV DL,'1'
         MOV AH,2
         INT 21h
         SUB i,1
         JMP NUMBER1
      P0:                 ;level for print 0
         MOV DL,'0'
         MOV AH,2
         INT 21h
         SUB i,1
         JMP NUMBER1
       
      OUTPUT1: 
      PRINTN
      PRINT "Second Number:"
         
      NUMBER2:      ;level for print second input
            CMP j,0
            JE OUTPUT2
            
            SHL CL,1
            JC Q1
            JNC Q0
      Q1:               ;kevel for print 1
         MOV DL,'1'
         MOV AH,2
         INT 21h
         SUB j,1
         JMP NUMBER2
      Q0:                    ;level for print 0
         MOV DL,'0'
         MOV AH,2
         INT 21h
         SUB j,1
         JMP NUMBER2
    
     OUTPUT2:
     PRINTN
     PRINT "Their Sum:"
     SHOW:               ;now we should print their sum in the same way
           CMP k,0
           JE EXIT
           
           SHL s,1
           JC R1
           JNC R0
      R1:              ;level for print 1
         MOV DL,'1'
         MOV AH,2
         INT 21h
         SUB k,1
         JMP SHOW
      R0:               ;level for print 0
         MOV DL,'0'
         MOV AH,2
         INT 21h
         SUB k,1
         JMP SHOW
     EXIT:           ;terminate programme
        ret 
         
       MAIN ENDP
  END MAIN
 



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Hexadecimal input output and add two numbers.click to see the code
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