Assembly 如何从字符串输入中删除逗号

我正在开发一个使用MIPS本机指令的程序，该程序允许用户输入三个十进制数作为以null结尾的字符串

每个数字不能超过六位数。如果用户输入逗号（例如123456），请从内存中删除该逗号

第一个数字存储在内存地址0x10000000中，第二个数字存储在0x10000008中，第三个数字存储在0x1000010中

• 我的代码在

  firstNumCounterChr

• 代码不增加$t0

• 代码不增加地址中的下一个字节

我的代码效率很低。我已经知道了，但我发现这样比使用子程序更容易，因为我几乎不理解MIPS

请建议

代码

.globl main
.globl main2
.globl main3
.globl firstNumCountChr
.globl firstIncremincrem
.globl secondNumCountChr
.globl secondNumIncrem
.globl thirdNumCountChr
.globl thirdNumInCrem

.data  

.text              
# 0x10000000 will store first number        
# 0x10000008 will store second number      
# 0x10000010 will store third number

main:    

#Input first number                                                                                                                                                                                                                                                                                                                                          
lui $a0, 0x1000                                                                                                                                                                
ori $a0, 0x0000             #reads number into memory(0x10000000)                                                                                                                                                                                                                                           
addi $a1, $0, 8             #7 characters 
addi $v0, $0, 8                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
syscall   

#removing comma of first number
addi $t1, 0               #$t1 is the counter set to 0  
add $t3, 0x2c             # 0x2c is acsii of "," in hex

firstNumCountChr:

lb $t2, 0($a0)            #load first byte from address in $a0
beq $t2, $0, end          #if $t2 == 0 go to end
or $0, $0, $0             #NOP
bne $t2, $t3, firstNumIncrem     #branch if symbol doesn't equal ","
or $0, $0, $0
add $t4, $a0, $0          #$t4 will save position of "," 

firstNumIncrem:

addi $t0, $0, 1           #increment address
addi $t1, $t1, 1          #increment counter
j firstNumCountChr               #loop


main2:

#inputing second number                                                                                                                                                                                                                                                                                                                                                                                        
lui $a0, 0x1000                                                                                                                                                          
ori $a0, 0x0008             #reads number into memory(0x10000008)                                                                                           
addi $a1,$0, 8              #7 characters   
addi $v0, $0, 8                                                                                                                                                                                                                                                                                                                                  
syscall 

#removing comma of second number
addi $t1, 0               # $t1 is the counter set to 0  
add $t3, 0x2c             # 0x2c is acsii of "," in hex

secondNumCountChr:

lb $t2, 0($a0)            # load first byte from address in $a0
beq $t2, $0, end          # if $t2 == 0 go to end
or $0, $0, $0             # NOP
bne $t2, $t3, secondNumIncrem     # branch if symbol doesn't equal ","
or $0, $0, $0             # NOP
add $t4, $a0, $0          # $t4 will save position of ","

secondNumIncrem:

addi $t0, $0, 1           #increment address
addi $t1, $t1, 1          #increment counter
j secondNumCountChr               #loop    

main3:                                                                                                                                                                  

#inputting third number                                                                                                                                                                                                                                                                                                                                                                                  
lui $a0, 0x1000                                                                                                                                                        
ori $a0, 0x0010              #reads number into memory(0x10000010)                                                                  
addi $a1, $0, 8              #7 characters  
addi $v0,$0, 8                                                                                                                                                                                                      
syscall  

#removing comma of third number
addi $t1, 0               #$t1 is the counter set to 0  
add $t3, 0x2c             # 0x2c is acsii of "," in hex

thirdNumCountChr:

lb $t2, 0($a0)            #load first byte from address in $a0
beq $t2, $0, end          # if $t2 == 0 go to end
or $0, $0, $0
bne $t2, $t3, thirdNumIncrem     #branch if symbol doesn't equal ","
or $0, $0, $0
add $t4, $a0, $0          # $t4 will save position of ","

thirdNumIncrem:

addi $t0, $0, 1           #increment address
addi $t1, $t1, 1          #increment counter
j thirdNumIncrem               #loop

end:
add $0, $0, $0

---

用户不能输入超过1个逗号？这将使您的8个字节溢出，包括0终止符。另外，不要将读/写数据放入

.text

部分；这是针对代码和只读数据的。在

.bss

部分中放置标签和

.skip 8

，或在

.data

中保留空间。您不需要子程序，但可以使用循环执行第一、第二和第三个数字。使用一个不同的寄存器来跟踪起始地址，并在一个外部循环中将其递增8

bne

在另一个寄存器中的结束地址上，因此您有一个

do{…string_buf+=8；}while（string_buf！=endp）循环。你有没有试过用C或其他语言设计算法？像
tmp=*src++；如果（tmp！='，'）*dst++=tmp，您可以通过从dst=src开始执行此操作。如果你在商店之后才检查
0
addi$t1，0
@Michael，我的天啊，我本想做addi$t1，0，0的话，它会免费复制nul终结者。谢谢知道如何遍历字符串吗？