如何在 C++ 中打印 \"
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how to print \" in C++
提问by user788171
I need to print a string that says exactly:
我需要打印一个字符串，准确地说：
std::string("-I\"/path/to/dir\" ");
Basically, I need to do this because I am using C++ code to generate C++ code.
基本上，我需要这样做，因为我使用 C++ 代码来生成 C++ 代码。
I want to write the above string via an ofstream, so something like
我想通过一个 ofstream 写上面的字符串，所以像
ofstream fout;
fout << the_string << endl;
The problem is that I cannot do \\"inside a string.
问题是我不能\\"在字符串里面做。
回答by sehe
Just escape the slash as well asthe quotes! I.e. \"--> \\\"
只需避开斜杠和引号！即\"-->\\\"
fout << "std::string(\"-I\\"/path/to/dir\\" \");" << std::endl;
in C++0x/C++11
在 C++0x/C++11
fout << R"(std::string("-I\"/path/to/dir\" ");)" << std::endl;
which uses a raw string literal1
它使用原始字符串文字1
See both versions tested live at http://ideone.com/TgtZK
在http://ideone.com/TgtZK 上查看现场测试的两个版本
1For which unsurprisingly the syntax highlighters for ideone.com and stackoverflow are not yet prepared :)
1意料之中的是，ideone.com 和 stackoverflow 的语法高亮器还没有准备好:)
回答by Adam Zalcman
This works:
这有效：
#include <iostream>
using std::cout;
using std::endl;
int main() {
cout << "std::string(\"-I\\"/path/to/dir\\" \");" << endl;
return 0;
}
printing
印刷
std::string("-I\"/path/to/dir\" ");
The point is: you need to escape both the slash and the quote.
关键是：您需要同时转义斜杠和引号。
回答by Мitke
You might wanna try to put additional "/" character, because the single "/" will not be parsed as string. I think it should work (I'm Java/C# guy, and I have encountered this problem myself couple of times).
您可能想尝试添加额外的“/”字符，因为单个“/”不会被解析为字符串。我认为它应该可以工作（我是 Java/C# 人，我自己也遇到过这个问题几次）。
回答by Karoly Horvath
I hope I understood your question correctly:
我希望我正确理解了你的问题：
Escape \and escape ":
逃脱\和逃脱"：
\\\"
\\\"
