2nd lab ( Take input in small letter and print Capital letter)

.MODEL SMALL   ; IN THIS COURSE ALL MODEL ARE SMALL
.STACK 100H    ; WE ALWAYS USE STACK 100H


.DATA     ; DATA SEGMENT
CR EQU 0DH   ; MAKE ODH IN CF.. IF WE NEED ODH WE CAN CALL IT USING CR,   CR = ODH
LF EQU 0AH   ; SAME ALSO WE CAN USE OAH BY LF,   LF = OAH

MSG1 DB "Enter a Lowwer Case: $"    ; DB - Define Byte. 8 bits,   DW - Define Word. Generally 2 bytes on a typical x86 32-bit system
                         ; $ SIGN IS USE TO END THE STING. IT HELP TO FIND THE STRING ENDING
MSG2 DB CR,LF,"In upper case it is: "   ; WE DO NOT GIVE $ BECAUSE WE WANT TO PRINT THE UPPER CASE ALSO
                                        ; WE USE CR,LF TO PRINT A NEW LINE AFTER 1ST STRING END
RESULT DB ?, "$"  ; WE USE $ SIGN HERE TO PRINT THIS ALO




.CODE

MAIN PROC       ; MAIN CODE START HERE

    ;PROGRAMME SEGMENT PREFIX
    MOV AX,@DATA
    MOV DS,AX    ; INITILATION OF DS



     LEA DX,MSG1   ; FOR STRING PRINT WE USE LEA FUNCTION TO LOAD THE STRING ; [FULL MEANING LEA : LOAD EFFICIENT ADRESS]
     MOV AH,9     ; FOR STRING PRINT WE USE AH,9 WHICH PRINT MY LOADED STRINT WHICH WAS MSG
     INT 21H      ; IT WILL INTRUPT THE WORK.


     MOV AH,1       ; IT WILL TAKE INPUT A LOWER CASE
     INT 21H        ; THE WORL WILL DONE HERE
     SUB AL,20H     ; IN ASCII CODE LOWER LETTER VALUE - 20 = UPPER LETTER,  SO WE MINIUS 20 FROM INPUT VALUE
     MOV RESULT,AL  ; NOW MOVE THE UPPER CASE VALUE IN RESULT. RESULT CONTAIN NOW THE UPPER CASSE OF THE INPUT



     LEA DX,MSG2   ; NOW LOAD SECOND STRING  TO PRINT
     MOV AH,9      ; IT WILL PRINT THE STRING
     INT 21H       ; MAKE THE COMPUTER TO DO IT



    MOV AX,4CH ; TERMINATED THE CODE AND EXIT
    INT 21H
    MAIN ENDP
END MAIN