string Mips如何存储用户输入字符串
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Mips how to store user input string
提问by jason dancks
I used to think I knew how to do this. But then I actually tried to do it. Here's the program I wrote but the Berkeley S*** simulator for mac said there was a syntax error on the last line. What did I do wrong?
我曾经以为我知道如何做到这一点。但后来我真的尝试这样做了。这是我编写的程序，但适用于 mac 的 Berkeley S*** 模拟器说最后一行存在语法错误。我做错了什么？
.text
.globl __start
__start:
la $a0,ask
li $v0,4
syscall
li $v0,8
syscall
la $t0,buffer
move $t0,$v0
syscall
la $a0,ret
li $v0,4
syscall
move $a0,$t0
li $v0,4
syscall
.data
ask: .asciiz "Enter string: "
ret: .asciiz "You wrote: "
buffer: .space 100
回答by jason dancks
Ok. I found a program buried deep in other files from the beginning of the year that does what I want. I can't really comment on the suggestions offered because I'm not an experienced spim or low level programmer.Here it is:
好的。从年初开始，我发现了一个深埋在其他文件中的程序，它可以执行我想要的操作。我无法真正评论所提供的建议，因为我不是经验丰富的垃圾邮件或低级程序员。这里是：
.text
.globl __start
__start:
la $a0,str1 #Load and print string asking for string
li $v0,4
syscall
li $v0,8 #take in input
la $a0, buffer #load byte space into address
li $a1, 20 # allot the byte space for string
move $t0,$a0 #save string to t0
syscall
la $a0,str2 #load and print "you wrote" string
li $v0,4
syscall
la $a0, buffer #reload byte space to primary address
move $a0,$t0 # primary address = t0 address (load pointer)
li $v0,4 # print string
syscall
li $v0,10 #end program
syscall
.data
buffer: .space 20
str1: .asciiz "Enter string(max 20 chars): "
str2: .asciiz "You wrote:\n"
###############################
#Output:
#Enter string(max 20 chars): qwerty 123
#You wrote:
#qwerty 123
#Enter string(max 20 chars): new world oreddeYou wrote:
# new world oredde //lol special character
###############################
回答by AceRam
# This code works fine in QtSpim simulator
.data
buffer: .space 20
str1: .asciiz "Enter string"
str2: .asciiz "You wrote:\n"
.text
main:
la $a0, str1 # Load and print string asking for string
li $v0, 4
syscall
li $v0, 8 # take in input
la $a0, buffer # load byte space into address
li $a1, 20 # allot the byte space for string
move $t0, $a0 # save string to t0
syscall
la $a0, str2 # load and print "you wrote" string
li $v0, 4
syscall
la $a0, buffer # reload byte space to primary address
move $a0, $t0 # primary address = t0 address (load pointer)
li $v0, 4 # print string
syscall
li $v0, 10 # end program
syscall
