Setting a class as a parameter?

[mrspiff]

Hey All,
I have a quick question on an assignment I have to do

I need to be able to write a function that takes an input stream and a video(from a class Video), out of 4 total video variables, as a parameter. The function that i called "inputVideo" is supposed to read information from the input stream into the video parameter. We are not supposed to do any prompting in the function.

So far I only know how to take an input stream as a parameter, but I'm getting really confused on how to take a video as one and then read the information from one to the other, without prompting in the function.

Also I'm confused on how to call the function in main.

Here is some code I have written out that uses the class and such that is directly in main:

cout << "Please enter the information for your video in the following format: "
       << endl;
       << "The title, the number of videos owned, number of videos available:" 
       << endl;
 
//read info. from video1 and put info. into it
    while (isspace(cin.peek()))
        cin.ignore();
    getline(cin, temp);
    video1.setTitle(temp);
    cin >> tempint;
    video1.setNumOwned(tempint);
    cin >> tempint2;
    video1.setNumAvailable(tempint2);

What I'm trying to figure out now is how to still prompt the user in main, like above, and then use the "inputVideo" function to read the information from the keyboard.

Any help would be greatly appreciated.
Thanks,

mrspiff

[ilikepython]

Hey All,
I have a quick question on an assignment I have to do

I need to be able to write a function that takes an input stream and a video(from a class Video), out of 4 total video variables, as a parameter. The function that i called "inputVideo" is supposed to read information from the input stream into the video parameter. We are not supposed to do any prompting in the function.

So far I only know how to take an input stream as a parameter, but I'm getting really confused on how to take a video as one and then read the information from one to the other, without prompting in the function.

Also I'm confused on how to call the function in main.

Here is some code I have written out that uses the class and such that is directly in main:

cout << "Please enter the information for your video in the following format: "
       << endl;
       << "The title, the number of videos owned, number of videos available:" 
       << endl;
 
//read info. from video1 and put info. into it
    while (isspace(cin.peek()))
        cin.ignore();
    getline(cin, temp);
    video1.setTitle(temp);
    cin >> tempint;
    video1.setNumOwned(tempint);
    cin >> tempint2;
    video1.setNumAvailable(tempint2);

What I'm trying to figure out now is how to still prompt the user in main, like above, and then use the "inputVideo" function to read the information from the keyboard.

Any help would be greatly appreciated.
Thanks,

mrspiff

Try something like this:

void inputVideo(istream &theStream, Video &theVideo)
{
    int x;
    theStream >> x;
    theVideo.value = x;
}
 

I don't really understand how you will prompt for the variable in main and at the same time read it from the keyboard in inputVideo. By prompt do you mean display a message?:

int main()
{
    Video video1;
    cout << "Please enter a value: ";
    inputVideo(cin, video1);
 
    return 0;
}
 

[mrspiff]

Yes, that is exactly what I don't understand either. Your first code post is what I thought we had to do, but when looking at the directions I get confused.

Here is what the directions say:

Write a function, inputVideo, that takes an input stream and a video as a parameter. This funtion should have a precondition that the input stream is open. The function should read information from the input stream into the video parameter. The function should NOT do any prompting.

(by prompting I assume not asking for variables.)

(in main)
Prompt the user to enter the information for video3, then use the inputVideo to read information from the keyboard into video3.

Any idea?

[mrspiff]

To top it off there is also an output function "outputVideo" that should be included also. Using the same parameters that should output the video information to the screen...

Hope that helps

[sicarie]

I would recommend pseudocoding the individual functions. If you pseudocode your main, you don't have to worry about the implementation of your functions, just what you pass and return to them. Then you can pseudocode them later - that helps cut down on everything you have to keep in your head. For example, your first function, you are given an fstream. You don't care where it came from, you just have it, you want to check it to make sure it is open, and then use it.

Does that help, or do you have a more specific algorithm question?

[mrspiff]

Yeah, I get the idea....

An example would help a ton though.