Question
Basically, the only work to do on this code is to : 1 - Print a space character between each of the four (4) bits
Basically, the only work to do on this code is to :
1- Print a space character between each of the four (4) bits
2- Display a meaningful error message and terminate if the number is out of range. Recall that the largest signed one byte number is 0111 11112= 27 - 1 = 127. The smallest possible number is 1000 00002 = -27 = -128.
.data
the_num: .asciiz "Enter a number in decimal: "
result_str: .asciiz ""
space: .asciiz " "
lessThanError: .asciiz "Number should be less than equal to 127!!! Exiting..."
greaterThanError: .asciiz "Number should be greater than equal to -128!!! Exiting..."
.align 2
.text
.globl __start
__start:
# ask and store the first number
li $v0, 4
la $a0, the_num
syscall
li $v0, 5
syscall
move $a0, $v0
jal print_bin
# New Line
li $v0, 11
li $a0, 10
syscall
j __start
print_bin:
add $t0, $zero, $a0 # put our input ($a0) into $t0
add $t1, $zero, $zero # Zero out $t1
addi $t3, $zero, 1 # load 1 as a mask
sll $t3, $t3, 7 # move the mask to appropriate position
addi $t4, $zero, 8 # 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
showLessError:
li $v0, 4
la $a0, lessThanError
syscall
j exit
showGreaterError:
li $v0, 4
la $a0, greaterThanError
syscall
j exit
exit:
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