Question

.Modify the following program so it can add two numbers between the values 0 and 9 The current program only handles one digit as the sum Your program must handle up to 9+9 as input and output up to 18 Here is the starter program ORIG x3000 ;begin at x3000 ; input two numbers IN input an integer character (ascii) TRAP 231 LD R3, HEXN30subtract x30 to get integer ADD RO, RO, R3 ADD R1, RO, x0move the first integer to register 1 IN input another integer [TRAP 23) ADD RO, RO, R3convert it to an integer add the numbers ADD R2, RO, R1 ;add the two integers ; print the results LEA RO, MESGload the address of the message string PUTS ADD RO, R2, x0 move the sum to RO, to be output LD R3, HEX30add 30 to integer to get integer character ADD RO, RO, R3 OUT "PUTS" outputs a string TRAP 221 ;display the sum TRAP 21) ;stop HALT. TRAP 25) ; data MESG .STRINGZ "The sum of those two numbers is:" HEXN30 FILL XFFDO-30 HEX HEX30 FILL x0030; 30 HEX END

; original codes provided as following

.ORIG x3000        ; begin at x3000

; input two numbers

IN                               ; input an integer character (ascii) {TRAP 23}

LD R3, HEXN30 ; subtract x30 to get integer

ADD R0, R0, R3

ADD R1, R0, x0 ; move the first integer to register 1

IN                               ; input another integer {TRAP 23}

ADD R0, R0, R3 ; convert it to an integer

; add the numbers

ADD R2, R0, R1 ; add the two integers

; print the results

LEA R0, MESG      ; load the address of the message string

PUTS                         ; "PUTS" outputs a string {TRAP 22}

ADD R0, R2, x0   ; move the sum to R0, to be output

LD R3, HEX30      ; add 30 to integer to get integer character

ADD R0, R0, R3

OUT                           ; display the sum {TRAP 21}

; stop

HALT       ; {TRAP 25}

; data

MESG .STRINGZ "The sum of those two numbers is: "

HEXN30 .FILL xFFD0 ; -30 HEX

HEX30 .FILL x0030 ; 30 HEX

.END

Answer 1

solution:

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