我正在学习MIPS，我正在尝试接受用户输入，将其存储在.data中，然后输出它。这是我目前的代码。
.data
test:
.word 4 #make a 4 byte (32 bit) space in memory for a word with address insert_into
Input:
.asciiz "\Please Enter a Positive Integer: " #in unused memory store an integer
Triangular_Output:
.asciiz " is a Triangular Number."
Not_Triangular_Output:
.asciiz " is not a Triangular Number: "
.text
main:
la $a0, Input #load address Ask_Input from memory and store it into arguement register 0
li $v0, 4 #loads the value 4 into register $v0 which is the op code for print string
syscall #reads register $v0 for op code, sees 4 and prints the string located in $a0
la $a0, test #sets $a0 to point to the space allocated for writing a word
li $v0, 5 #load op code for getting an integer from the user into register $v0
syscall #reads register $v0 for op code, sees 8 and asks user to input a string, places string in reference to $a0
la $a0, test #load address insert_into from memory and store it into arguement register 0
li $v0, 1 #loads the value 1 into register $v0 which is the op code for print integer
syscall #reads register $v0 for op code, sees 4 and prints the string located in $a0
la $a0, Triangular_Output #load address Tell_Output from memory and store it into arguement register 0
li $v0, 4 #loads the value 4 into register $v0 which is the op code for print string
syscall #reads register $v0 for op code, sees 4 and prints the string located in $a0
li $v0, 10 #loads op code into $v0 to exit program
syscall #reads $v0 and exits program
我收到了这个
请输入正整数：6
268500992是一个三角数。
我知道问题在于我正在阅读测试的地址而不是内容，但我无法弄清楚如何让它读取测试。
我正在MARS中编译这个
答案 0 :(得分：1)
我已修复了下面的错误。但是，在我们达到一些风格点之前......
我总是赞扬好评。你的是每条指令的明确措辞。这是因为你刚开始并试图理解每条指令及其作用。
但是，好的评论应该表明意图（即）算法正在做什么而不仅仅是模仿指令。指令是“如何”，评论应该是“什么/为什么”。
所以，在我能够诊断并修复你的程序之前，我做的第一件事就是稍微减少评论。另外，我喜欢遵循80列规则，特别是对于asm。
如果syscall行有一个，那么 li $v0,...确实不需要评论。
如果您在记住给定指令的作用时遇到问题，请考虑顶部的注释块，该块会解释每个注释的机制。你正在重复指令集引用，但它比在每一行上做的更好
这是简化的代码，带有注释和修复的错误：
.data
# make a 4 byte (32 bit) space in memory for a word with address insert_into
# in unused memory store an integer
test: .word 4
Input: .asciiz "\Please Enter a Positive Integer: "
Triangular_Output: .asciiz " is a Triangular Number."
Not_Triangular_Output: .asciiz " is not a Triangular Number: "
.text
main:
la $a0,Input # address of string to print
li $v0,4 # syscall for print string
syscall
# NOTE/BUG: syscall 5 does _not_ need $a0 to be preset and it returns the
# read value in $v0
la $a0,test # get address of test
li $v0,5 # syscall getting an integer from the user
syscall
# here are two ways to save off the value:
move $t0,$v0 # save to a register that won't be clobbered
sw $v0,test # save to memory location
# NOTE/BUG: we do _not_ want the _address_ of test, but rather its
# _contents_ (i.e.) use "lw" instead of "la"
la $a0,test # get address of test
lw $a0,test # get value of test
li $v0,1 # syscall for print integer
syscall
la $a0,Triangular_Output
li $v0,4 # syscall for print string
syscall
li $v0,10 # syscall for program exit
syscall
这是编写程序的一种稍微瘦一点的方法：
.data
# make a 4 byte (32 bit) space in memory for a word with address insert_into
# in unused memory store an integer
test: .word 4
Input: .asciiz "\Please Enter a Positive Integer: "
Triangular_Output: .asciiz " is a Triangular Number."
Not_Triangular_Output: .asciiz " is not a Triangular Number: "
.text
main:
la $a0,Input # address of string to print
li $v0,4 # syscall for print string
syscall
li $v0,5 # syscall getting an integer from the user
syscall
# NOTE: this assumes we will use the value later -- otherwise, we could
# replace the _two_ move instructions with a single "move $a0,$v0"
move $t0,$v0 # save to a register that won't be clobbered
move $a0,$t0 # get value to print
li $v0,1 # syscall for print integer
syscall
la $a0,Triangular_Output
li $v0,4 # syscall for print string
syscall
li $v0,10 # syscall for program exit
syscall