C++ 输出到文本文件时的换行符
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C++ New line character when outputting to a text file
提问by James Warner
This is just a quick question. But I am trying to output data to a file, which works fine. However I am also trying to implement a new line at the appropriate point so the data, prints on individual lines.
这只是一个简短的问题。但我正在尝试将数据输出到一个文件中，该文件工作正常。但是，我也试图在适当的点实现一个新行，以便数据打印在单独的行上。
This is how my code currently looks:
这是我的代码目前的样子：
main.cpp
主程序
Writer w("Output.txt");
w.writeString("The number of words in the script are: ");
w.writeInt(count);
w.writeEol();
w.writeString("The number of Officers in the script are: ");
w.writeInt(ofCount);
w.writeEol();
w.writeString("The number of Courtiers in the script are: ");
w.writeInt(cCount);
w.close();
Writer.cpp
Writer.cpp
void Writer::writeEol()
{
out << "\n" << endl;
}
My code has to be implemented this way as my whole system is built around it like this.
我的代码必须以这种方式实现，因为我的整个系统都是围绕它构建的。
So my question is, how would I adjust my Writer::writeEol() to add a new line to my output file?
所以我的问题是，我将如何调整我的 Writer::writeEol() 以在我的输出文件中添加一个新行？
My output file currently comes out like this:
我的输出文件目前是这样的：
The number of words in the script are: 32339The number of Officers in the script are: 2The number of Courtiers in the script are: 9
Any help is greatly appreciated. :)
任何帮助是极大的赞赏。:)
回答by Mario
Without a proper question I can just guess what you're trying to learn, so feel free to update your "question" with an actual question:
如果没有正确的问题，我只能猜测您要学习的内容，因此请随时使用实际问题更新您的“问题”：
You're essentially writing two line breaks into the file, depending on the encoding (i.e. Windows or Unix line breaks) you won't see the difference:
您基本上是在文件中写入两个换行符，具体取决于编码（即 Windows 或 Unix 换行符），您不会看到区别：
std::endlwill automatically include the correct character to create a linebreak. There's no need to write "\n"as well.
std::endl将自动包含正确的字符以创建换行符。也没必要写"\n"。
Also you don't have to pass std::endlto the stream unless you really want a line break at the specific position:
此外，std::endl除非您真的想要在特定位置换行，否则您不必传递给流：
std::cout << "The result is: ";
std::cout << 50 << std::endl;
Keep in mind that depending on your editor you might not see all line breaks, e.g. Windows Notepad won't show a line break with only \n. It will instead appear as an invisible character. For actual line breaks that are accepted you'd beed \r\n. In comparison, the Open Source editor Notepad++ accepts and displays both kinds of line breaks.
请记住，根据您的编辑器，您可能不会看到所有换行符，例如 Windows 记事本不会显示仅带有\n. 相反，它将显示为一个隐形字符。对于被接受的实际换行符，你会 beed \r\n。相比之下，开源编辑器 Notepad++ 接受并显示两种换行符。
回答by icabod
In your writeEol()method, you output both a newline (\n), and you write out a std::endl. These both have the effect of writing out a newline, which is what you want. However, the std::endlwill also flush the stream, which in some cases is not desireable (it could cause slowdown if the stream is flushed after every line).
在您的writeEol()方法中，您既输出换行符 ( \n)，又写出std::endl. 这些都具有写出换行符的效果，这正是您想要的。但是，它std::endl也会刷新流，这在某些情况下是不可取的（如果在每行之后刷新流，可能会导致速度减慢）。
I think that your code will do what you want (albeit with two newlines), but as shuttle87 states, you only need a \nat the end of each line to achieve the desired affect.
我认为您的代码会做您想做的事情（尽管有两个换行符），但正如 Shuttle87 所述，您只需要\n在每行末尾添加一个即可实现所需的效果。
