Write an assembly language program to convert an uppercase letter to a lowercase letter.

Experiment Name: Write an assembly language program to convert an uppercase letter to a lowercase letter.

Objective:

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

          (ii) Input a Character.

          (iii) Output a Character.

Source code:

.model small

.stack

.data

          Adb 0dh,0ah, “ENTER an INPUT...”, 0dh, 0ah, “$”

          Bdb0dh,0ah, “The OUTPUT is...”,0dh,0ah, “$”

.code

 main proc

          mov ax,@data

          mov ds,ax

          lea dx, A

          mov ah,09h

          int 21h

          mov ah,01h

          int 21h

          add al,20h

          mov bl,al

          lea dx,B

          mov ah,09h

          int 21h

          mov dl,bl

          mov ah,02h

          int 21h

          mov ah,4ch

          int 21h

main endp

end main

Input/output:

          C:\Users\CSE422>prb18

          ENTER an INPUT…

          A

          The OUTPUT is …

          a