Write an assembly language program to calculate the following expression Y=M+N – P+1

Experiment Name: Write an assembly language program to calculate the following expression

Y=M+N – P+1

Objective:

(i) To know about several command in the Assembly language.

(ii) Input a Character.

(iii) Output a Character.

Source code:

Print macro msg

                   Lea dx,msg

                   Mov ah,09h

                   Int 21h

Endm

Dosseg

.model small

.stack

.data

                   Msg1 db 0dh,0ah, ‘M=$’

                   Msg2 db 0dh,0ah, ‘N=$’

                   Msg3 db 0dh,0ah, ‘P=$’

                   Msg4 db 0dh,0ah, ‘Y=M+N – P+1=$’

.code

Main proc

                   Mov ax,@data

                   Mov ds,ax

                   Print msg1

                   Mov ah,01h

                   Int 21h

                   Sub al,30h

                   Push ax

                   Print msg2

                   Mov ah,01h

                   Int 21h

                   Sub al,30h

                   Push ax

                   Print msg3

                   Mov ah,01h

                   Int 21h

                   Sub al,30h

                   Push ax

                   Pop cx

                   Pop sx

                   Pop  ax

                   Mov ah,00

                   Add al,bl

                   Sub al,cl

                   Add al,01

                   Push ax

                   Print msg4

                   Pop ax

                   Mov dl,al

                   Add dl,30h

                   Mov ah,02h

                   Int 21h

                   Mov ah,4ch

                   Int 21h

Main endp

End main

Input/output:

          M= 1

          N=2

          P=3

          Y=M+N – P+1 = 1