fstreams

This is a discussion on fstreams within the C++ Programming forums, part of the General Programming Boards category; I am trying to write a program to practice for an upcoming test that is supposed to take in these ...

  1. #1
    UpTooLate
    Join Date
    Feb 2008
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    New York
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    Question fstreams

    I am trying to write a program to practice for an upcoming test that is supposed to take in these names and numbers from a file and then take the average of all the numbers of the file. I am not allowed to use getline. Our teacher hinted that you can use cin to stuff 2 things on one line like this;
    int x, y;
    cin >> x >> y;
    but I'm not sure how that works.

    The file (Sect51.dat) looks something like this:
    Will 66
    Matthew 85
    Andy 97
    Sarah 24
    Rachel 76
    Mandy 94

    This is what I have so far, but it is not working.
    Code:
    #include <fstream>
    #include <iostream>
    using namespace std;
    
    int main()
    {
    	ifstream WOW;
    	WOW.open("Sect51.dat");
    	string x;
    	int y, aNumber;
    	int count = 0;
    	while (WOW >> aNumber)
    	{
    		cin >> x >> y;
    		count++;
    		y += y;
    		
    	}
    	cout << "The average is " << y / count << "." << endl;
    	return 0;
    }

  2. #2
    and the Hat of Guessing tabstop's Avatar
    Join Date
    Nov 2007
    Posts
    14,185
    So, every loop you try to read (1) aNumber, (2) x, and (3) y. But ... there's not three things on each line. So don't try to read aNumber.

  3. #3
    Registered User
    Join Date
    Jan 2005
    Posts
    7,319
    Also, you're using cin, but that's for console input. Use your ifstream for file input.

    And pay attention to the values y will have as the loop progresses.

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