如果语句不正常工作

如果语句不正常工作

本文介绍了如果语句不正常工作?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述



我使用调试器查看并查看,并且似乎无法找出为什么IF语句总是打印该消息。IF语句检查是否yesno !='Y'||(或)'N'
但不管如果我键入y或Y或n N或HB它将显示...。我不知道什么动作,使得更多!我不能找到它的错误?

  if(yesno!='Y'||'N'){。 .. 

解决方案

|| 并不意味着你的想法。正确的方法是:

  if(yesno!='Y'&& yesno!='N' .. 

这会评估&&

请注意


$

b $ b

  if(yesno!='Y'|| yesno!='N'){... 

会始终为真,因为任何给定的字符都是不是不是N.这可能不是你想要的。


I've looked and looked with the debugger and cannot seem to figure out why the IF statement always prints the message.

The IF statement checks to see if yesno != 'Y' ||(or) 'N'but regardless if i type y or Y or n N or H B it will show... . Im not sure what move to make anymore! I cant seem to find where its going wrong?

if(yesno != 'Y' || 'N') { ...

Thanks guys.

解决方案

The || doesn't quite mean what you think it means. The correct approach is:

if (yesno != 'Y' && yesno != 'N') { ...

This evaluates each side of the && independently, and the result is true if both sides are true.

Note that

if (yesno != 'Y' || yesno != 'N') { ...

will always be true because any given character is either not Y or it is not N. This is probably not what you want.

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08-06 02:58