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Very simplest code, takes string as input in upper case and result it in lower case

Discussion in 'Assembly Language Programming (ALP) Forum' started by Shayaan_Mustafa, Sep 3, 2013.

  1. Shayaan_Mustafa

    Shayaan_Mustafa New Member

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    Hello experts!

    I am trying to making a program which takes string as input in upper case and give result in lower case.

    First, I wrote a program which takes a letter as input in upper case and give result in lower case.
    Here is that program,
    Code:
    .model small
    .stack 32h
    .code
    mov ah,08
    int 21h
    add al,20h
    mov dl,al
    mov ah,02h
    int 21h
    mov ah,4ch
    int 21h
    end
    Now I want to write a program which takes string as input in upper case and give output the same string as lower case,
    Here is what I did so far,
    Code:
    .model small
    .stack 100h
    .data
    string db 20
    .code
    mov ax,@data
    mov ds,ax
    mov dx,offset string
    mov ah,0ah
    int 21h
    mov ah,4ch
    int 21h
    end
    In the second code, I have written a program which takes input in any case. But what should I do now to convert it in lower case?

    NOTE: I am using MASM v6.11 and using windows 7. Intel assembly Language

    Thank you
     

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