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An Assembly Language Program that reads a two characters compare them and prints the smallest character ( Simulation of If-Else structure ) .
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.MODEL SMALL .STACK 100H .DATA PROMPT_1 DB 'Enter the First character : $' PROMPT_2 DB 'Enter the Second character : $' PROMPT_3 DB 'The smallest character 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 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 LEA DX, PROMPT_2 ; load and print PROMPT_2 MOV AH, 9 INT 21H MOV AH, 1 ; read a character INT 21H MOV BH, AL ; save the input character into BH MOV AH, 2 ; carriage return MOV DL, 0DH INT 21H MOV DL, 0AH ; line feed INT 21H LEA DX, PROMPT_3 ; load and print PROMPT_3 MOV AH, 9 INT 21H CMP BL, BH ; compare the BL and BH JNBE @ELSE ; jump to label @ELSE if BL>BH MOV DL, BL ; move first character into DL JMP @DISPLAY ; jump to label @DISPLAY @ELSE: ; jump label MOV DL, BH ; move second character into DL @DISPLAY: ; jump label MOV AH, 2 ; print the character INT 21H MOV AH, 4CH ; return control to DOS INT 21H MAIN ENDP END MAIN |