Help with opening files

This is a discussion on Help with opening files within the C++ Programming forums, part of the General Programming Boards category; Hey all, I need to open a file for reading. I know that usually you would declare an object like ...

  1. #1
    Registered User
    Join Date
    Sep 2002
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    92

    Question Help with opening files

    Hey all,
    I need to open a file for reading. I know that usually you would declare an object like so:
    Code:
    fstream InputFile; // declaring a stream object
    InputFile.open("myfile", ios::in);
    Only problem is I need to declare the filename I need to open at a prompt. In other words, 'myfile' is the filename that needs to be opened but its a variable. How would I go about doing that? Thank you.

  2. #2
    Used Registerer jdinger's Avatar
    Join Date
    Feb 2002
    Posts
    1,065
    Code:
    #include <string>
    
    string Filename;
    
    cin<<Filename;
    //of course, you want to put some error checking after the cin
    
    ifstream ifs;
    ifs.open(Filename.c_str(),ios::in);

  3. #3
    Registered User
    Join Date
    Sep 2002
    Posts
    92

    One more thing(a sentinel-check)

    How about if you want to check if the user entered an escape sentinel like 0 to exit out of the program. Would your code look something like this?
    Code:
    if (Filename.c_str() == '0'){
        cerr << "Thank  you for using this program";
        return 0;
    }

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