write_testfile.asm

.data
 ask_str1: .asciiz "Enter a number PLEASE: "
 result_str: .asciiz ""
 .align 2

.text
 .globl __start

__start:
 # ask and store the first number
 li $v0, 4
 la $a0, ask_str1
 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, 31 # move the mask to appropriate position
 addi $t4, $zero, 32 # 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