我需要你的帮助来解决这个在 MIPS 程序集中排序的问题：
如何编写 MIPS 程序来读取仅包含十进制整数的文本文件并按降序对它们进行排序。
该程序应执行以下操作：
■ 打开一个文本文件并将其内容读入一个字符数组。该数组应限制为 1000 个字符。MARS 提供用于打开和读取文本文件的系统调用。
■ 逐个字符遍历数组。将每个十进制字符串转换为二进制。十进制字符串由一个或多个十进制字符组成。它应该以空格或换行符结尾。忽略并跳过所有其他字符。将所有十进制整数存储到单词数组中。整数数组的大小应限制为 100 个字。
■ 按降序对整数数组进行排序。
■ 显示排序后的数组
实际上我对数组进行排序没有问题，因为我有它，但是处理文本文件，从中读取，转换为十进制插入数组的问题。
你有什么想法 ？注释 ？建议？
提前谢谢
更新：有人问这是什么问题？问题是如何从 txt 文件中读取，将数字转换为十进制？这就是问题。
好的，，，我将发布与您的问题类似的问题的部分解决方案（虽然很复杂），，，
数据初始化
# Data Buffers
m1Buff: .space 20000 # File 1 Data Buffer
numBuff: .space 200 # String Number Buffer
# Arrays
m1: .double 1:100
从文件读取并保存到缓冲区的代码
############################################################
#### Open the file for reading
li $v0, 13 # system call for open file
la $a0,m1File # input file name
li $a1, 0 # flags
li $a2, 0 # Open for reading (mode is 0: read, 1: write)
syscall # open a file (file descriptor returned in $a0)
move $t0, $a0 # save the fd (syscall below will overwrite $a0)
############################################################
#### read from file just opened
li $v0, 14 # system call to read from file
la $a1,m1Buff # address of buffer to store read data.
li $a2, 20000 # max num of cahrs to read.
syscall # read from file
############################################################
#### Getting number of characters read from file.
move $s0,$a0 # $s0 = number of read characters
############################################################
#### Close the file
li $v0, 16 # system call for close file
move $a0, $t0 # Restore fd
syscall # close file
############################################################
至于转换为十进制数 ,,, 我在 2 年前编写了这个程序来将字符串转换为浮点数（它还读取指数，即 2.23E5） ,,, 在您的情况下，您需要将字符串转换为十进制更容易,,, 你应该能够弄清楚如何自己做下面的过程,,,
#####################################################################################################
#####################################################################################################
## String To FP Procedure
##
## INPUTS : A String That Is Terminated With Null Char.
## $a0 = address of String
##
## Author : Manaf Abu.Rous
#####################################################################################################
#####################################################################################################
str2float:
move $t1,$a0 # load Address Of Sttring In $t1
li $t0,10 # t0 = 10
mtc1 $t0,$f2 # move $t0 to $f2
cvt.d.w $f2,$f2 # f2 = 10 ( Used for Multiplication & Division )
li $t0,0 # t0 = 0
mtc1 $t0,$f4 # move $t0 to $f4
cvt.d.w $f4,$f4 # f4 = 0 = Integer Part. (Used To Generage The Integer Part Of The Number)
li $t0,0 # t0 = 0
mtc1 $t0,$f6 # move $t0 to $f6
cvt.d.w $f6,$f6 # f6 = 0 = Fraction Part. (Used To Generage The Fraction Part Of The Number)
li $t6,0 # $t6 = 0 = Exponent Part. (Used To Generage The Exponent Part Of The Number)
li $t3,0 # $t3 = 0 ( Used To Determine The Sign Of The Number, +ve = 0, -ve = 1 )
li $t4,0 # $t4 = 0 ( Used To Count The Number of Digits In a Fraction )
li $t5,0 # $t5 = 0 ( Used To Determine If The Next Char Is a Fraction , Yes = 1, No = 0)
li $t7,0 # $t5 = 0 ( Used To Determine If The Next Char Is an Exponent , Yes = 1, No = 0)
#---------------------------------------------------------
#------------------------------------------------------------------------------
# Loop for visiting the buffer Char by Char and Constructing an Integer String
#------------------------------------------------------------------------------
readLoop:
lb $t2,0($t1) # load byte (char) in $t2
#--------------------------------------------------------------------
# -------- Check For "-" Sign
bne $t2,0x2d,skipNeg # check if char = "-" ? if yes > sign reg = 1.
li $t3,1 # $t3 = 1 ( Used To Determine The Sign Of The Number )
j NextChar
skipNeg:
#--------------------------------------------------------------------
#--------------------------------------------------------------------
# -------- Check For "." Dot
bne $t2,0x2e,skipDot # check if char = "." ? if yes > Go Read Fraction
li $t5,1 # $t3 = 1 > Next Chars Are Fractinos
j NextChar
skipDot:
#--------------------------------------------------------------------
#--------------------------------------------------------------------
# -------- Check For "E" Exponent
bne $t2,0x45,skipE # check if char = "E" ? if yes > Go Read Exponent
li $t7,1 # $t3 = 1 > Next Chars Are Exponent
j NextChar
skipE:
#--------------------------------------------------------------------
#--------------------------------------------------------------------
# -------- Check For Null Char ( End Of String)
beq $t2,0x00,FinishNumber # check if char = Null ? if yes > we are done with the number.
#--------------------------------------------------------------------
#---------------------------------
# Check What's The Current Char
#---------------------------------
beq $t7,1,readExponent # if $t7 = 1 (Next Char is Exponenet) Jump To ReadExponent
beq $t5,1,readFraction # if $t7 = 1 (Next Char is Exponenet) Jump To ReadFraction
#-------------------------------------------------------------------------
# --------- Read Integer Part Of Char And Convert Them To Float
readInteger:
subi $t2,$t2,0x30 # subtract 0x30 from char to convert it to a number.
mtc1 $t2,$f10 # move $t2 to $f6
cvt.d.w $f10,$f10 # f6 = converte integer to a FP number.
mul.d $f4,$f4,$f2 # =((old)+2 X 10)
add.d $f4,$f4,$f10 # =((old)+ 2)
j NextChar
#-------------------------------------------------------------------------
#-------------------------------------------------------------------------
# --------- Read Fraction Part Of Char And Convert Them To Float
readFraction:
subi $t2,$t2,0x30 # subtract 0x30 from char to convert it to a number.
mtc1 $t2,$f10 # move $t2 to $f6
cvt.d.w $f10,$f10 # f6 = converte integer to a FP number.
mul.d $f6,$f6,$f2 # =((old)+2 X 10)
add.d $f6,$f6,$f10 # =((old)+ 2)
addi $t4,$t4,1 # Increment Fractions Digits Counter
j NextChar
#-------------------------------------------------------------------------
#-------------------------------------------------------------------------
# --------- Read Exponenet Part Of Char And Convert Them To Integer
readExponent:
li $t0,10
subi $t2,$t2,0x30 # subtract 0x30 from char to convert it to a number.
mult $t6,$t0 # =((old)+2 X 10)
mflo $t6
add $t6,$t6,$t2 # =((old)+ 2)
j NextChar
#-------------------------------------------------------------------------
NextChar:
addiu $t1,$t1,1 # increment the address for the next buffer byte.
j readLoop
###################################### Finish Number Code ######################################
FinishNumber:
# Finalizing Fraction Part And Adding It To Integer Part ------------------
beq $t5,0,skipFrac # If There's No Fraction Part Then Skip. ($t5 != 1) > Skip
li $t0,1 # $t0 = 1
mtc1 $t0,$f20 # move $t0 (Counter) to $f20
cvt.d.w $f20,$f20 # f20 = 1
FracLoop: #-------- Loop To Multiply 10 By It Self (Fraction Ditigs Counter) Times
mul.d $f20,$f20,$f2 # $f20 = $f20 X $f2 ($f20 = $f20 X 10)
addi $t4,$t4,-1 # Decrement Fraction Digits Counter
bgtz $t4,FracLoop
div.d $f6,$f6,$f20 # $f6 = $f6 / $f20 ($f6 = Fraction Part / FractionsDigits X 10 )
add.d $f4,$f4,$f6 # $f4 = $f4 + $f6 ( $f4 = IntegerPart + Fraction Part )
skipFrac:
# -------------------------------------------------------------------------
# Exponent Part -----------------------------------------------------------
beq $t7,0,skipExp # If There's No Exponenet Part Then Skip. ($t7 != 1) > Skip
beq $t6,1,skipExp # If The Exponent Is = 1 Then Skip
addi $t6,$t6,-1 # Correct Exponent.
mov.d $f18,$f4
ExpLoop: #-------- Loop To Compute The Exponenet (Multiply Number By It Self (Expoenet) Times)
mul.d $f4,$f4,$f18 # $f4 = $f4 X $f4 ( Multiply Number By It Self )
addi $t6,$t6,-1 # Decrement Fraction Digits Counter
bgtz $t6,ExpLoop
skipExp:
# -------------------------------------------------------------------------
# Checking Sign Register --------------------------------------------------
bne $t3,1,skipSign # if $t3 != 1 Then Skip
neg.d $f4,$f4 # $f4 = - $f4
skipSign:
# -------------------------------------------------------------------------
# Save The Number In $f0 To Be Returned
mov.d $f0,$f4 # $f0 = Converted String ( To Be Returned )
################################### End Of Finish Number Code ##################################
jr $ra # Return
#####################################################################################################
# End Of Procedure
#####################################################################################################
现在剩下的是从文件缓冲区中读取，，循环遍历字符，，将它们转换为十进制数，，，并将它们保存到数组中。
使用 $v0=13,$a1=0,$a2=0 的系统调用打开文件。
然后使用 $v0=14 的系统调用将其读入缓冲区。