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Re:如果没有输入了，不会停留在cin那一句上吗？

Posted by hong_liming at 2003-07-08 12:35:24 on Problem 1000
In Reply To:如果没有输入了，不会停留在cin那一句上吗？ Posted by:waterine at 2003-07-07 19:31:06

c++和pascal不太一样,pascal中最后一项数据读完,eof(f)就返回真了,而c++在这时不去判断文件是否读完.最后一项数据读完以后,再读下一项,产生一个错误,(但并不会停留,只是所读变量没有被赋值),这时eof(f)检测到这个错误才意识到文件已经读完了,返回真.
书上是这么写的,
if(!cin)等价于if(cin.fail())
if(cin)等价于if(cin.good())

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多谢！:) (0) waterine 2003-07-08 17:55:51

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