Working with strings
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Use std::string.
Beware: a string literal (e.g. "Hello World") is NOT a std::string but a const *char.
Most std functions and classes do not take a std::string as an argument, but a *char.
E.g.:
ifstream inf("file.txt"); // Ok, because "file.txt" is a *char.
std::string file = "file.txt";
ifstream inf(file); // Fail, because file is not a *char but a std::string.
// Solution:
ifstream inf(file.to_c); // Ok.std::string is actually an object that has a .to_c member that casts the string to a *char.