Addition of Two Numbers - Assembly Language - MASM

SUM OF TWO NUMBERS

Program:

.model small

.stack 200H

.data

   msg1 DB 10,13,'Enter the first no: $'

   msg2 DB 10,13,'Enter the second no: $'

   msg3 DB 10,13,'sum = $'

   newline DB 10,13, ' $'

.code

   print MACRO msg ;macro definition

   PUSH AX

   PUSH DX

   MOV AH,09H

   MOV DX,offset msg

   INT 21H

   POP DX

   POP AX

   ENDM

.startup

   print msg1

   CALL readnumtoAX

   MOV CX,AX

   print newline

   print msg2

   CALL readnumtoAX

   print newline

   print msg3

   ADD ax,cX

   CALL displayAX

.exit

readnumtoAX PROC NEAR

   PUSH BX

   PUSH CX

   MOV CX,10

   MOV BX,00

back:

   MOV AH,01H

   INT 21H

   CMP AL,'0'

   JB skip

   CMP AL,'9'

   JA skip

   SUB AL,'0'

   PUSH AX

   MOV AX,BX

   MUL CX

   MOV BX,AX

   POP AX

   MOV AH,00

   ADD BX,AX

   JMP back

skip:

   MOV AX,BX

   POP CX

   POP BX

   RET

readnumtoAX ENDP

displayAX PROC NEAR

   PUSH DX

   PUSH CX

   PUSH BX

   PUSH AX

   MOV CX,0

   MOV BX,10

back1:

   MOV DX,0

   DIV BX

   PUSH DX

   INC CX

   OR AX,AX

   JNZ back1

back2:

   POP DX

   ADD DL,30H

   MOV AH,02H

   INT 21H

   LOOP back2

   POP AX

   POP BX

   POP CX

   POP DX

   RET

  displayAX ENDP

end

Output:

F:\>adn1

Enter the first no: 27

Enter the second no: 32

sum = 59