Needing help with this assignment. It needs to be in LC-3 assembly language. Wri

Question

Needing help with this assignment. It needs to be in LC-3 assembly language.

Write an LC-3 assembly language program that counts the number of positive and negative numbers in a sequence of numbers that are stored beginning at address x3300. The last number in the sequence is 0. Your program must start at address x3000 The program's output must be the following 2 lines: Count of negative numbers: n Count of positive numbers: mmmm Where nnnn and mmm are the number of negative and positive numbers respectively Number of digits in nnnn and mmmm is not fixed. You can not assume any upper bounds on nnnn and nnn

Explanation / Answer

.orig x6000

LD R2, SEQUENCE ; R2 = x3300

AND R1, R1, 0 ; R1 = 0 (clear before add) positive number

AND R3, R3, 0 ; R3 = 0 (clear before add) negative number

LOOP LDR R0, R2, 0 ; R0 <-- mem[R2 + 0] ;

CMPI R0, R0, 0

BRz LOOP_DONE

CMPI R0, R0, 0

BRn NEG ; if R0 < 0 then NEG

ADD R1, R1, 1 ; R1++

BR NEXT

NEG ADD R3, R3, 1 ; R3++

NEXT ADD R2, R2, 4

BR LOOP ; loop

LOOP_DONE LEA R0, msg_pos ;load the address of the msg_pos

PUTS ;Prints the message string

ADD R0, R1, 0

OUT

LOOP_DONE LEA R0, msg_neg ;load the address of the msg_pos

PUTS ;Prints the message string

ADD R0, R3, 0

OUT

HALT ; halt

SEQUENCE .fill x3300

msg_pos .STRINGZ " Count of negative numbers: "

msg_neg .STRINGZ " Count of positive numbers: "

.end

Related Questions

Navigate

• Browse (All)
• Browse N
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.