在while循环中使用文本作为条件 [英] Using text as condition in a while loop

问题描述

使用文本作为while循环的条件时遇到麻烦，目前的基本编码为:

Im having some trouble with using text as an condition for a while loop, currently the basic coding is:

result=struct('val','yes');

while result.val=='yes'
result.val=input('more digits?');
end

因此，正如您所看到的，Im试图做的就是只要用户输入是"就保持循环继续进行.但这就是我所拥有的一个探秘之一.有没有一种方法可以消除写"的需要(例如，是，而不是是")?其次，当我运行代码时，它给我错误信息使用==时出错，矩阵尺寸必须一致.".我意识到这与是"比不"更长有关，但我不知道如何解决.尽管考虑到程序仍然会终止，但这并不是一个真正的问题，但这是我想要摆脱的烦恼.

So as you see, what Im trying to do is keeping the loop going as long as the user types in 'yes'. But thats one of the probelmes I am having; Is there a way to get rid of the need to write the ''(e.g yes instead of 'yes')? Secondly, when I run the code it gives me the error message "Error using == ,Matrix dimensions must agree.". I realise this have to do with the word yes being longer than no, but I don't know how to fix it. It's not really an issue though considering its the the program ends anyway, but it is an annoyance I would like to get rid off.

推荐答案

要比较字符串，请使用

To compare strings, use strcmp, or strcmpi to ignore case. It will handle comparison of different length strings. For example:

strcmpi(result.val,'yes')

如果要在输入的开头搜索子字符串，例如仅搜索'y'，请考虑

If you want to search for a substring, such as just a 'y', at the beginning of the input, consider strncmpi (strncmpi(result.val,'y',1)) or just check the first character (result.val(1)).

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