MIPS如何比较从输入中获取的字符？ [英] MIPS how can you compare a character taken from input?

问题描述

我的程序询问用户他/她正在考虑的号码是否在列表中。用户输入y或n。如何检查用户是否在汇编中输入y或n？如果等于121（对于'y'的十进制ASCII码）或分支，如果值等于110（对于'n'

My program asks the user if the number he/she is thinking of is in a list. The user inputs a y or an n. How can I check if a user has entered y or n in assembly? Is it sufficient to put the user input into a register and branch if equal to 121 (decimal ASCII code for 'y') or branch if the value is equal to 110 (decimal ASCII code for 'n'?

提前感谢

推荐答案

可以使用系统调用代码读取字符系统调用代码12，那么字符（二进制ASCII代码）将被存储在$ v0中，然后你可以使寄存器等于121，另一个寄存器等于110.然后分支如果相等。

One can use the system call code for Read Character, which should be system call code 12, then the character (binary ASCII code) will be stored in $v0. Then you can make a register equal to 121 and another to 110. Then branch if equal.

SPIM系统调用代码：
http://www.doc.ic.ac.uk/lab/secondyear/spim/node8.html

SPIM system call codes: http://www.doc.ic.ac.uk/lab/secondyear/spim/node8.html

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