开发一个项目，用于搜索段落中的单词，并可以执行两个不同的操作。一个是找到或不存在的单词。另一个是使用MIPS替换另一个相同大小的单词。
答案 0 :(得分：0)
有一个程序来查找单词的长度，看看是否有帮助： 。数据
的字符串： .asciiz“在遥远的星系之前永远创造了 被称为地球的神话中的星球，广阔的文明已经得到了解决 统治银河系的是一个星际帝国，它是从一个废墟中创造出来的 世代相持的旧共和国“ 返回： .asciiz“\ n” wordcntmsg： .asciiz“长度x的字数\ n” 新队： .asciiz“\ n” 字长： .ascii“character word =”
.align 4
表：.space 100
.text
.globl main
主：
la $t0, string # stores the address for string in $t0
la $s1, TABLE
addi $t2, $0, 32 # stores the ascii value for space in $t2
LOOP： lbu $ t1,0（$ t0）＃加载下一个字符 beq $ t1，$ 0，DONE #END OF STRING NOP beq $ t1，$ t2，RESETWLC #space NOP addi $ s0，$ s0,1 #inclement word length cnt。 addi $ t0，$ t0,1 #point下一个字符。 j LOOP NOP
RESETWLC： #inclement这个单词长度的单词lenght cnt ＃来自内存位置。（$ s1） #ref memory location。
beq $s0,$0,PreviousSF
nop
# address computation
add $t3,$0,$s0 #
addi $t3,$t3,-1
sll $t3,$t3,2 # multiply 4 to get byte address.
add $t3,$t3,$s1 # get momory address.
lw $t4,0($t3) # get previous word length cnt from the memory.
addi $t4,$t4,1
sw $t4,0($t3) # inclement and store the cnt back.
add $s0,$0,$0 #reset word length cnt
PreviousSF：
addi $ t0，$ t0,1 #point下一个字符。
j LOOP
nop
完成：＃打印并退出..
beq $s0,$0,PRINT
nop
# address computation
add $t3,$0,$s0 #
addi $t3,$t3,-1
sll $t3,$t3,2 # multiply 4 to get byte address.
add $t3,$t3,$s1 # get momory address.
lw $t4,0($t3) # get previous word length cnt from the memory.
addi $t4,$t4,1
sw $t4,0($t3) # inclement and store the cnt back.
PRINT：
la $ a0，wordcntmsg
li $ v0,4
系统调用
li $ t0,26
li $ t1,1
P_LOOP：移动$ a0，$ t1 li $ v0,1 系统调用 la $ a0，字长 li $ v0,4 系统调用 添加$ t3，$ 0，$ t1＃ addi $ t3，$ t3，-1 sll $ t3，$ t3,2＃乘以4得到字节地址。 添加$ t3，$ t3，$ s1＃get momory address。 lw $ a0,0（$ t3）＃从内存中获取前一个字长cnt li $ v0,1 系统调用 la $ a0，换行 li $ v0,4 系统调用 addi $ t1，$ t1,1 beq $ t1，$ t0，EXIT NOP j P_LOOP NOP
退出：addi $ v0，$ 0,10 系统调用＃退出程序
LB_SUB: #
add $t4, $0, $a0 #
srl $t4, $t4, 2 #
sll $t4, $t4, 2 #
sub $t5, $a0, $t4 #
addi $t7, $0, 8 #
mul $t6, $t5, $t7 #
lw $v0, 0($t4) #
addi $t8, $0, 24 #
sub $t8, $t8, $t6 #
sll $v0, $v0, $t8 #
srl $v0, $v0, 24 #
jr $ra #
答案 1 :(得分：0)
.data
para: .space 1000 # Pre allocate space for the input paragraph
copypara: .space 1000 #copy the original paragraph
input: .space 30 # Pre allocate space for the input word
copy: .space 30 # Duplicate string to store the word
replace: .space 30 # The alternative word
replacemsg: .asciiz "Enter the word you want to replace with the word you want to find: \n" #display the msg to enter the alternative word
ask: .asciiz "Enter the paragraph:\n" # Display msg to enter the paragraph
askwd: .asciiz "Enter the word you want to find:\n" # Display msg to enter the word you want to find
nomatch: .asciiz "Sorry...The word is not present in the given paragraph.\n"
match: .asciiz "Number of times the word present in the paragraph is :-\n"
line: .asciiz "\n"
origpar: .asciiz "\nTHE ORIGINAL PARAGRAPH IS:- \n-----------------------------------------------------------------------------\n"
result: .asciiz "-----------------------------------------------------------------------------\nTHE MODIFIED PARAGRAPH IS:-\n-----------------------------------------------------------------------------\n"
error: .asciiz "Sorry...The word you you want to replace with is not the same size of the word you want to find.\n"
#======================================================================================================================================================================
#-----------------------------------------------------------------------------------------------------
# USE OF REGISTERS:
#
# $s5- Stores characters of copypara
# $t5- Stores ascii value of new line
# $s2- Stores characters of word to find
# $s4- Stores characters of word to replace
# $s0- Stores characters of copy,.i.e , the extracted word
# $s1- Stores characters of the entered paragraph
# $t4- Counts the number of characters in the word to find and also acts as a counter
# $t7- Stores the number of times the find word is found
# $t6- Counts the number of characters in the extracted word
# $t0- Stores the characters of the input paragraph and is also used in the case comparision
# $t8- Stores the characters of the input paragraph
# $t2- Stores the characters of the word to find and the extracted word
# $t3- Stores the characters of the extracted word and also used in case comparision
# $s7- Stores the numer of characters of the word to find and the extracted word that are equal
#
#----------------------------------------------------------------------------------------------------
.text
main:
# print the msg to enter the paragraph
li $v0,4
la $a0,ask
syscall
# Take the input paragraph
la $a0,para
li $a1,1000 # allocate 1000 empty space
li $v0,8
syscall
la $s5,copypara #load the the base address of the copypara
# print the msg to enter the word you want to find
li $v0,4
la $a0,askwd
syscall
# take the word
la $a0,input
li $a2,30 # create 30 empty spaces
li $v0,8
syscall
move $s2,$a0 # move the adress of the input word from $a0 to $s2
# print the msg to enter the word you want to replace
li $v0,4
la $a0,replacemsg
syscall
# take the word
la $a0,replace
li $a2,30
li $v0,8
syscall
move $s4,$a0 # the alternative word address is on $s4
# Assign the recquired ascii values in registers and load the base address of the recquired variables in their respective registers
li $t5,10 # ascii value of new line
la $s0,copy # loading the addresses of copy of extracted word and the original para
la $s1,para # loading the address of the paragraph
li $t4,1 # count the number of letters present in input word
li $t7,0 # count the number of times the word present
# Count the number of letters prsent in the input word
lb $t6,0($s2)
count:
beq $t6,10,countreplace
addiu $s2,$s2,1
lb $t6,0($s2)
addi $t4,$t4,1
j count
# This block count the number of letters present in replace word
countreplace :
la $s4,replace
li $t1,1
lb $t3,0($s4)
counting:
beq $t3,10,minor
addiu $s4,$s4,1
lb $t3,0($s4)
addi $t1,$t1,1
j counting
# This minor restores the variable containts in their respecive registers
minor:
li $t6,1 # count the number of letters present in the extracted word
la $s2,input # load the base address of the input word
lb $t0,0($s1) # loading the first character of the para
j extract
# This block stores the the replace word in place of the input word iff the word is found
store2:
la $s4,replace
li $t0,1
storing2:
beq $t0,$t4,intr
lb $t2,0($s4)
sb $t2,0($s5)
addiu $t0,$t0,1
addiu $s4,$s4,1
addiu $s5,$s5,1
j storing2
j intr
# This block is used to restore the original word present in the paragraph if the input word is not found
store1:
li $t0,1
la $s0,copy
storing1:
beq $t0,$t6,intr
lb $t2,0($s0)
sb $t2,0($s5)
addiu $t0,$t0,1
addiu $s0,$s0,1
addiu $s5,$s5,1
j storing1
# This block is used to re-initialize the register containt after one itteration
intr:
la $s4,replace
lb $t0,0($s1)
beq $t0,10,Display
la $s0,copy
li $t6,1
addiu $s1,$s1,1
lb $t0,0($s1)
sb $t8,0($s5)
addiu $s5,$s5,1
# This block is used to extract each word from the paragraph and store it in another variable called copy
extract:
lb $t8,0($s1)
beq $t0,32,compare
beq $t0,46,compare
beq $t0,10,compare
beq $t0,44,compare
beq $t0,40,compare
beq $t0,41,compare
beq $t0,39,compare
beq $t0,34,compare
beq $t0,45,compare
beq $t0,58,compare
beq $t0,59,compare
beq $t0,63,compare
beq $t0,33,compare
beq $t0,123,compare
beq $t0,125,compare
beq $t0,91,compare
beq $t0,93,compare
beq $t0,96,compare
beq $t0,95,compare
sb $t0,0($s0)
addi $t6,$t6,1
addiu $s0,$s0,1
addiu $s1,$s1,1
lb $t0,0($s1)
j extract
#Compare the extracted word and the input word
compare:
sb $t5,0($s0)
la $s2,input
la $s0,copy
lb $t2,0($s2)
lb $t3,0($s0)
bne $t6,$t4,store1
li $s7,0
check:
bne $t2,$t3,checkagain
backagain:
addi $s7,$s7,1
beq $s7,$t4,success
addiu $s2,$s2,1
addiu $s0,$s0,1
lb $t2,0($s2)
lb $t3,0($s0)
j check
# This block is used to handle the case sensitiveness of the program
checkagain:
addi $t3,$t3,32
addi $t0,$t3,-64
beq $t2,$t3,backagain
beq $t2,$t0,backagain
j store1
# This block is used to count the number of times the word is present in the paragraph
success:
addi $t7,$t7,1
j store2
# This block display the messeges according to their results
Display:
bne $t4,$t1,errormsg
beq $t7,0,msg
li $v0,4
la $a0,match
syscall
li $v0,1
la $a0,($t7)
syscall
li $v0,4
la $a0,line
syscall
li $v0,4
la $a0,origpar
syscall
li $v0,4
la $a0,para
syscall
li $v0,4
la $a0,result
syscall
li $v0,4
la $a0,copypara
syscall
j exit
msg:
li $v0,4
la $a0,nomatch
syscall
li $v0,4
la $a0,origpar
syscall
li $v0,4
la $a0,para
syscall
j exit
errormsg:
li $v0,4
la $a0,match
syscall
li $v0,1
la $a0,($t7)
syscall
li $v0,4
la $a0,line
syscall
li $v0,4
la $a0,error
syscall
li $v0,4
la $a0,origpar
syscall
li $v0,4
la $a0,para
syscall
# The exit block
exit:
li $v0,10
syscall