装配算法

Question

这是我的算法，用于将数字除以2，直到商数达到0它停止，但我需要打印剩余部分，使其为二进制，我尝试在下面的代码中。但是当我运行它时，它不会打印任何东西。

 a = userInput/2
 if (a doesNotEqual 0)
 {
  while(quotient doesNotEqual 0)
  { 
    quotient=a/2
    a = quotient
   }
 }

!!!!!!

.section ".data"

prompt: .asciz "\nEnter a number: "
format: .asciz "%d"


prompt2: .asciz "\nPlease choose one of the following options: \n 1. Print the number in binary seperating each 4 bits with a space. \n"
prompt3: .asciz " 2. blahblahblahblahblahblahblahblahblahblahblahblah. \n 3. blahblahbalhblahblahbla. \n"
prompt4: .asciz " 4. blahblahblahblahblahblahblahb \n 5. Enter in a new number \n 6. Quit the program\n\n"
format2: .asciz "%d"


string: .asciz "\nYou entered option: %d\n"

string1: .asciz "%d"




define(a,l0)
define(quotient, l1)
define(remainder, l2)


!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
.align 4
input: .word 0
input2: .word 0


.align 4
.section ".text"
.global main
main:
save %sp, -96, %sp


clr   %a
clr   %quotient

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
set   prompt, %o0
call  printf
nop
set   format, %o0
set   input, %o1
call  scanf
nop
ld   [%o1], %g1                  ! g1 = userInput #


set   prompt2, %o0               ! menu
call  printf
nop
set   prompt3, %o0
call  printf
nop
set   prompt4, %o0
call  printf
nop
                                 ! menu
set   format2, %o0
set   input2, %o1
call  scanf
nop
set  input2, %o1
ld   [%o1], %g2                 ! g2 = option selected
set  string, %o0
mov  %g2, %o1
call printf
nop                             ! this is a check to see that g2 is indeed the option selected

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!problem somewhere below
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

mov   %g1, %o0
call  .div
mov   2, %o1
mov   %o0, %a                      ! a = input #/2
cmp   %a, 0                        ! if (a doesNotEqual 0)
be    done

test:

cmp   %quotient, 0                ! while(quotient doesNotEqual 0)
be    done1
nop
mov   %a, %o0
call  .div
mov   2, %o1                      
mov   %o0, %quotient              ! quotient = a/2


mov   %a, %o0
call  .rem
mov   2, %o1
mov   %o0, %remainder
set   string1, %o0
mov   %remainder, %o1
call  printf
nop

mov   %quotient, %a               ! a = quotient

ba    test
nop

done:
done1:

ret
restore

Answer 1

因为您在nl和input之间交错input2，后者将不再对齐，因此总线错误。顺便说一句，我已经看到你多次做nl这件事了，我相信我已经告诉过你这根本没有意义。 scanf不使用第三个参数，因为格式字符串只有一个字段说明符，即使它有，也不会是换行符。

你可能还有其他问题，这只是我发现的第一个问题。学习使用调试器。