Exam 3 bonus Programming Problem Write the program in Notepad® and run it succes

Question

Exam 3 bonus Programming Problem

Write the program in Notepad® and run it successfully in SPIM before uploading it to eCampus as a text file with .s extension. If not running correctly, include comments on what assembly error or output you are getting.

Your program is to print the binary representation of a decimal number using a divide by 2 conversion routine.

1. Use syscall 4 to prompt for a number between -128 and 127 as listed in the data declaration label prompt:

2. Input a number (using syscall 5)

3. If the number is not within the limits, print message at label err: and try again.

4. Convert this decimal number to binary and output its binary representation to the console using divide by 2 method.

4a. Push each remainder on the stack then pop them and print them using syscall 1. A header as listed in the data declaration label ans: should precede that.

4b. The magnitude of the number will always be 8 bits with MSB =1 for negative numbers and 0 for positive numbers.

5. The program will continue prompting for a number as long as y is entered when prompted as listed in the data declaration label newin:

5a. If any other character is entered, the program prints the message at label term: in the data declaration and exits the program.

Hint: The 8-bit binary representation of a negative number m is the same as that of positive number equal to 256 + m.

The beginning of the program and the data declaration are given below

# Program to convert a number between -128 and 127 to its binary equivalent and

# outputs its binary representation to the console.

.text

main:             

.data

prompt:         .asciiz " Input a decimal number between -128 and 127: "

ans:               .asciiz " Binary representation is "

err:                 .asciiz " input error - try again!"

term:             .asciiz " Program terminated"

newin:           .asciiz "Do you want to try another number? (y for yes) "

Explanation / Answer

.data

prompt: .asciiz " Input a decimal number between -128 and 127: "

ans: .asciiz " Binary representation is "

err: .asciiz " input error - try again!"

term: .asciiz " Program terminated"

newin: .asciiz "Do you want to try another number? (y for yes) "
.text
main:
li $v0,4
la $a0,prompt
syscall

input:
li $v0 5
syscall
move $t1 $v0

#
push:
beq $t3 0 pop
rem $t3 $t1 2
mov $s0 $t3
sw $s0 0x0($sp)
addi $sp $sp -4
div $t3 $t3 2

pop:
li $v0 4
la $a0 ans
syscall
beq $sp 0 exit
addi $sp $sp +4
lw $t4 ($sp)

li $v0 4
la $a0 $t4
syscall

#

bgt $t1 127 l1
blt $t1 -128 l1

l1:
li $v0,4
la $a0,err
syscall
j l2

l2:
li $v0 4
la $a0 newin
syscall
#respond
li $v0 5
syscall
move $t2 $v0
beq $t2 'y' input
j exit

exit:
li $v0,4
la $a0,term
li $v0 10
syscall

Related Questions

Navigate

• Browse (All)
• Browse E
• Subjects

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