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An Assembly Language Program to read a letter in lower case and print it after converting it in to Upper case
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.MODEL SMALL .STACK 100H .DATA PROMPT_1 DB 'Enter the Lower Case Letter : $' PROMPT_2 DB 'The Upper Case Letter is : $' .CODE MAIN PROC MOV AX, @DATA ; initialize DS MOV DS, AX LEA DX, PROMPT_1 ; load and print PROMPT_1 MOV AH, 9 INT 21H MOV AH, 1 ; read a letter INT 21H MOV BL, AL ; save the letter in BL MOV AH, 2 ; return carriage MOV DL, 0DH INT 21H MOV DL, 0AH ; line feed INT 21H LEA DX, PROMPT_2 ; load and print PROMPT_2 MOV AH, 9 INT 21H SUB BL, 20H ; convert a lower case letter to upper case letter MOV AH, 2 ; print the Upper case letter MOV DL, BL INT 21H MOV AH, 4CH ; return control to DOS INT 21H MAIN ENDP END MAIN |