Question

MIPS Assembly Language

Write a MIPS assembly language program that asks the user to input an integer and then prints out a string that shows how that integer should be encoded using 16 bits. Your program should handle both positive and negative valued inputs. Your program should also print out an error message if the given input cannot be expressed as a 16 bit signed integer.

As an example, if the input is 12, your program should output “0000000000001100”. If the input is 34000, your program should print out an error since the largest 16 bit signed integer is 215 - 1 = 32767.

Answer 1

.data

ask_str1: .asciiz "Enter a number between -32768 , 32767 :: "

printError: .asciiz "Number out of range!! Exiting...."

result_str: .asciiz ""

printMessage: .asciiz "Binary conversion is : "

.align 2

.text

.globl __start

__start:

# ask and store the first number

li $v0, 4

la $a0, ask_str1

syscall

li $v0, 5

syscall

bgt $v0,32767,exit

blt $v0,-32768,exit

move $s0, $v0

li $v0, 4

la $a0, printMessage

syscall

jal print_bin

# New Line

li $v0, 10

syscall

print_bin:

add $t0, $zero, $s0 # put our input ($a0) into $t0

add $t1, $zero, $zero # Zero out $t1

addi $t3, $zero, 1 # load 1 as a mask

sll $t3, $t3, 15 # move the mask to appropriate position

addi $t4, $zero, 16 # loop counter

loop:

and $t1, $t0, $t3 # and the input with the mask

beq $t1, $zero, print # Branch to print if its 0

add $t1, $zero, $zero # Zero out $t1

addi $t1, $zero, 1 # Put a 1 in $t1

j print

print: li $v0, 1

move $a0, $t1

syscall

srl $t3, $t3, 1

addi $t4, $t4, -1

bne $t4, $zero, loop

jr $ra

exit:

li $v0, 4

la $a0, printError

syscall

output: