Unicode 转换为符号 C++

Question

I want to convert my unicode string (unic) which is "U+XXXX" to "\\uxxxx" so I could print a symbol, yet I get the following error: incomplete universal character name \\u|\u003c/i>

string unic = "U+xxxx";
unic.substr(2);
string symb="\u";
unic.insert(0, symb);
cout<<unic<<endl;

Answer 1

In addition to the backslash issue already pointed, you must assign unic.substr(2) to a variable because it is not a destructive operation :

string unic = "U+xxxx";
unic = unic.substr(2);
string symb="\\u";
unic.insert(0, symb);
cout<<unic<<endl;