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,

Answer 1

you can just use another string to verify the extension like this :

string fileName;

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

//string txt = fileName.Right(4);
string ext="";
for(int i = fileName.length()-1;i>fileName.length()-5;i--)
{
    ext += fileName[i];
}
cout<

checking if equals "txt." cause i starts with the length of the filename so ext is filled in the opposite way