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编写代码的指令如下：

**编写一个SPIM汇编语言程序convert.s。该程序将执行以下操作： 提示用户输入表示摄氏度或华氏度的字母。

C 或 c 表示输入的温度以摄氏度为单位。

F 或 f 表示输入的温度是华氏温度。

如果输入的字母不是 C、c、F 或 f，则打印出错误消息“Wrong Letter！”

提示用户输入一个整数，表示与刚刚输入的字母匹配的温度。

将温度转换为对应的温度。
这里有两个公式供您参考：F = (9 * C / 5) + 32

C = 5 * (F - 32) / 9

使用适当的消息打印出转换后的值。**

这是我写的代码：

## Program name: convert.s
## 
## Purpose: 
##         -It's going to prompt the user to enter F, f, C, or c  
##         -It will convert from Celsius to Fahrenheit or from Fahrenheit to Celsius
##         -If the user enters a different letter, it will not convert and it's going to show an error
## Formula of conversion:
##    F = (9 * C / 5) + 32
##  
##    C = 5 * (F - 32) / 9
##
##   t0- Temperature integer
##   t1- Choice between C or F
##   t2- t1 choice 
##   a0- points to strings to be printed 
##
##
#################################################
#                                               #
#               text segment                    #
#                                               #
#################################################

.text
.globl__start
__start:               #Execution starts here

la $a0, Userchoice    #Print prompt on terminal
li $a1, 3             #System call to print
li $v0, 8
syscall               #Out a string

move $t1, $a0

## User's choice 
lb $t2, ($t1)      #get byte from the input letter
beq $t2, 'C', Celsius # jump to celsius
beq $t2, 'c', Celsius 
beq $t2, 'F', Fahrenheit #jump to fahrenheit
beq $t2, 'f', Fahrenheit
j error     #if user enters wrong letter, jump to error

## F to C
Fahrenheit: 
  la $a0, promtFahrenheit
  li $v0, 4
  syscall

   li $v0,5 #Reads integer
   syscall
   jal F2C

   move $t3, $t0 
   j printFarenheit

F2C
  sub $t0, $v0, 32 #Subtract 32 to F
  mul $t0, $t0, 5  #Multiply by 5
  div $t0, $t0, 9  #Divide by 9
  jr $ra


## C to F
Celsius: 
  la $a0, promptCelsius
  li $v0, 4 
  syscall 

   li $v0, 5  #reads integer
   syscall
   jal C2F 
   move $t3, $v0
   j printCelsius

C2F:
  mult $t0, $v0, 9 #Multiply by 9 
  div $t0, $t0, 5  #Divide by 5
  addi $t0, $t0, 32 #Add 32
  jr $ra

## Error
error:
  la $a0, error #Print error 
  li $v0, 4
  syscall
  j end #program ends here

## Print 
printCelsius: 
  la $a0, ansC #print string 
  li $v0, 4
  syscall

  move $a0, $t3 #print result
  li $v0, 4
  syscall

  la $a0, endl #print out a new line 
  li $v0, 4
  syscall

  j end #end program

printFahrenheit:
  la $a0, ansC #print string
  li $v0, 4
  syscall

  move $a0, $t3 #print result 
  li $v0, 1
  syscall

  la $a0, endl #print out a new line 
  li $v0, 4    
  syscall 

  j end #end program

## End Program
end: 
  la $a0, endl # print out and start new line
  li $v0, 4
  syscall 
  li $v0, 10
  syscall #bye

#################################################
#                       #
#               data segment            #
#                       #
#################################################

.data 

Userchoice: .space 3

prompt: .asciiz "Type 'C' to enter temperature in Celsius\nand 'F' to enter temperature in Fahrenheit: "

promptCelsius: .asciiz "Enter temperature in Celsius: "
ansC: .asciiz "The temperature in Celsius is: "

promptFahrenheit: .asciiz "Enter temperature in Fahrenheit: "
ansF: .asciiz "The temperature in Celsius is: "

error: .asciiz "Incorrect letter! Try again.\n"

endl: .asciiz "\n"

# End of file convert.s

但是当我将此代码添加到 PCSPim 时，我得到一个错误，我不知道如何修复它！请帮忙！！

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