A few questions on classes!..

Discussion in 'C++' started by Natrius, Sep 10, 2006.

  1. Natrius

    Natrius New Member

    Sep 10, 2006
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    I just recently registred at this forum and I must say it seems to be a nice and friendly place!
    I'm currently studying a beginners course in C++ and I'm a bit stuck right now.. So I thought perhaps it might be a good idea to ask soem questions here and see if any of you guys could help me out!

    My problems are the following..

    1. I'm making a program with a default constructor and an overloaded constructor. They're both called by different rules and produces a testline of text when called. The assignment is to give the overloaded constructor default arguments to see what happens. I wonder, what is a default argument i an overloaded constructor?

    2. How do you instance an object from a class in different scope?

    3. How do you send an object "by value" to a function?

    4. Here's a "Non class" question.
    How do you make a function which swaps the values of two indexes on a vector (like swaps numbers[1] with numbers[2])?
    I've tried to make this but it only works when showing the results of the swap in the function, not when I show the results in the main function. When doing that it remains unchanged.
    Here's the code I've used. What am I doing wrong?

    #include <iostream>
    #include <vector>
    using namespace std;
    int swap_values(vector<int>numbers);
    int main ()
        cout << "Let's swap vector values\n";
        cout << "Enter value 1 " << endl;
        cin >> numbers[1];
        cout << "Enter value 2 " << endl;
        cin >> numbers[2];
        cout << "vector 1: " << numbers[1] << endl;
        cout << "vector 2: " << numbers[2] << endl;
        cout << "vector 3: " << numbers[3] << endl;
        cout << "vector 1: " << numbers[1] << endl;
        cout << "vector 2: " << numbers[2] << endl;
        cout << "vector 3: " << numbers[3] << endl;      
        return 0;
    int swap_values(vector<int>numbers)
        numbers[3] = numbers[1];
        numbers[1] = numbers[2];
        numbers[2] = numbers[3];
        return 1;
    Thanks a lot for helping me! It means a lot!


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