Read data from file and put into vector

This is a discussion on Read data from file and put into vector within the C++ Programming forums, part of the General Programming Boards category; Hi everyone. I'm new to this board and am just starting to learn C++. I'm having difficulties with part of ...

  1. #1
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    Read data from file and put into vector

    Hi everyone. I'm new to this board and am just starting to learn C++. I'm having difficulties with part of a problem I'm trying to solve. I need to read data from a file, which contains integers representing date and time, and insert the data into a vector.

    My data file for appointments are layed out like so, representing month day year hour minute:

    05 16 2012 09 00
    08 30 2011 10 30

    My elementary vector so far looks like this:

    vector<Appointment*> fileData;
    fileData[0] = new Appointment(read_month_data_from_file, read_day_data_from_file, read_year_data_from_file, read_hour_data_from_file, read_minute_data_from_file);

    I've added the read_ parts to represent where the data needs to be transfered into.

    Any help would be greatly appreciated. Thanks for the time and help in advance.

  2. #2
    Registered User manasij7479's Avatar
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    Overload the >> Operator for Appointment and get the values like you do with std::cin, only replacing it with the name of your object.
    Manasij Mukherjee | gcc-4.9.2 @Arch Linux
    Slow and Steady wins the race... if and only if :
    1.None of the other participants are fast and steady.
    2.The fast and unsteady suddenly falls asleep while running !



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    Thanks for the reply manasij. I'm not seeing how that helps solve my problem (I'm new, so I'm most likely not making the connection properly).

    So I need to get data from:
    ifstream input_data;
    input_data.open("appointments.txt");

    And put that data into:
    vector<Appointment*> fileData;
    fileData[0] = new Appointment(read_month_data_from_file, read_day_data_from_file, read_year_data_from_file, read_hour_data_from_file, read_minute_data_from_file);

  4. #4
    C++ Witch laserlight's Avatar
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    Do you really need to store Appointment pointers? Why not use a std::vector<Appointment> instead? If you do have a good reason to use pointers, why not use a std::vector<std::shared_ptr<Appointment>> or std::vector<std::unique_ptr<Appointment>> instead?

    Quote Originally Posted by optimus203
    My elementary vector so far looks like this:

    vector<Appointment*> fileData;
    fileData[0] = new Appointment(read_month_data_from_file, read_day_data_from_file, read_year_data_from_file, read_hour_data_from_file, read_minute_data_from_file);
    One problem is that you need to actually create the element in the vector, e.g., by using push_back.
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

  5. #5
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    Code:
    int m, d, y, h, n;
    while (input_data >> m >> d >> y >> h >> n)
    	fileData.push_back(new Appointment(m, d, y, h, n));

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