c++ - How to check if string ends with .txt

Question

I am learning basic C++, and right now I have gotten a string from a user and I want to check if they typed the entire file name (including .txt) or not. I have the string, but how can I check if the string ends with ".txt" ?

string fileName;

cout << "Enter filename: 
";
cin >> fileName;

string txt = fileName.Right(4);

The Right(int) method only works with CString, so the above code does not work. I want to use a regular string, if possible. Any ideas?

Answer 1

Unfortunately this useful function is not in the standard library. It is easy to write.

bool has_suffix(const std::string &str, const std::string &suffix)
{
    return str.size() >= suffix.size() &&
           str.compare(str.size() - suffix.size(), suffix.size(), suffix) == 0;
}