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An Assembly Language Program that reads a character and prints it only if it is a Upper Case Letter ( Simulation of If-Else then structure ).
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.MODEL SMALL .STACK 100H .DATA PROMPT DB 'Enter the character : $' MSG_1 DB 'The input letter is : $' MSG_2 DB 'The input character is not an Upper Case Letter.$' .CODE MAIN PROC MOV AX, @DATA ; initialize DS MOV DS, AX LEA DX, PROMPT ; load and print PROMPT MOV AH, 9 INT 21H MOV AH, 1 ; read a character INT 21H MOV BL, AL ; save the input character into BL MOV AH, 2 ; carriage return MOV DL, 0DH INT 21H MOV DL, 0AH ; line feed INT 21H CMP BL, "A" ; compare input character and "A" JB @DISPLAY ; jump to label @DISPLAY if input<A CMP BL, "Z" ; compare input character and "Z" JA @DISPLAY ; jump to label @DISPLAY if input>Z LEA DX,MSG_1 ; load and print MSG_1 MOV AH, 9 INT 21H MOV AH, 2 ; print the character MOV DL, BL INT 21H JMP @EXIT ; jump to label @EXIT @DISPLAY: ; jump label LEA DX,MSG_2 ; load and print MSG_2 MOV AH, 9 INT 21H @EXIT: ; jump label MOV AH, 4CH ; return control to DOS INT 21H MAIN ENDP END MAIN |