如何打印带有输入整数的二进制数? [英] How do I print a binary number with an inputed integer?

问题描述

我正在尝试将输入的整数转换为二进制，但似乎无法在程序中找到错误.我能够加载输入的数字以及打印出8位二进制数字，但是1都没有被打印.我究竟做错了什么?

I'm trying to convert a inputed integer to binary and I cannot seem to find the error within my program. I'm able to load the inputed number as well as print out a 8 digit binary number, however none of the 1's are being printed. What am I doing wrong?

 enterNum: 
.asciiz "Enter your number (base 10):  "
 printBaseTwo: 
.asciiz "The number in base 2 is:  "
 #-----------------------------------------------------------------------

.text
#Print out string, collect intger input
main: li $v0, 4
      la $a0, enterNum
      syscall
  li $v0, 5
  syscall
  move $t0, $v0


#create mask/print out the second string and prepare to print out binary
mask: 
  andi $t1, $zero, 1
  sll $t1, $t1, 7
  addi $t2, $zero, 8
  li $v0, 4
  la $a0, printBaseTwo
  syscall


 # compares mask to integer, starting at the most sig place
 # if the mask is zero, print out zero
 loop: 
  and $t3,$t0, $t1
  beq $t3, $zero, print
  add $t3, $zero, $zero
  addi $t3, $zero, 1
  j print


 print: 
      #prepares to print integer in $a0
  li $v0, 1

      # moves either 1 or 0 into $a0 to be printed
  move $a0, $t3
  syscall

      # shifts over right 1, getting closer to 0
  srl $t1, $t1, 1

      #lowers count
  addi $t2, $t2, -1

      #loop back to beginning if not finished printing binary Num
  bne $t2, $zero, loop
  beq $t2, $zero, exit
 exit: 
  li $v0, 10
  syscall

推荐答案

我要从32位MIPS版本开始回答这个问题.

I'm answering this question starting from a 32-bit MIPS version.

首先，当要求十进制数时，MIPS将其保存为32位数字在其寄存器中.因此，我做出了以下判断:

First of all, when asking for a decimal number, MIPS saves this as a 32-bit number in its registers. Therefore I did the following adjusments:

andi $t1, $zero, 1
sll $t1, $t1, 7
addi $t2, $zero, 8

成为:

add $t1, $zero, 1
sll $t1, $t1, 31
addi $t2, $zero, 32

注意如何将andi更改为addi.如果您使用的是8位版本的MIPS，则这是唯一必要的调整.

Notice how I changed the andi into addi. If you were working in an 8-bit version of MIPS, this would be the only necessary adjustment.

希望我能解决您的问题，它可以在此处的MARS模拟器中正常工作！

I hope I solved your question, it works in the MARS-simulator overhere!

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