Classes and Function in C++ | Together C & C++ | Page 1

hearty haloBOT Feb 16, 2023, 6:12 AM

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sand moat Feb 16, 2023, 7:17 AM

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What is "a Wallet 3"?

uncut harbor Feb 16, 2023, 7:17 AM

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A Wallet 3 by adding wallet 1 and wallet 2

sand moat Feb 16, 2023, 7:18 AM

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You already did that.

uncut harbor Feb 16, 2023, 7:18 AM

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Wallet w3(w1.getQuarters() + w2.getQuarters(), w1.getDimes() + w2.getDimes(), w1.getNickles() + w2.getNickles(), w1.getCents() + w2.getCents());

cout << endl
     << "W3:";
cout << "\t" << w3.getQuarters() << " quarters" << endl;
cout << "\t" << w3.getDimes() << " dimes" << endl;
cout << "\t" << w3.getNickles() << " nickels" << endl;
cout << "\t" << w3.getCents() << " cents" << endl;

double total3 = ((w3.getQuarters() * 25 + w3.getDimes() * 10 + w3.getNickles() * 5 + w3.getCents()) / 100.0);
cout << "\t--------> amount = $" << total3 << endl;

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Instead of these lines in the main function to have the Wallet 3

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we will create it by using a regular function outside the main function

sand moat Feb 16, 2023, 7:20 AM

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Make a function, copy/paste the code into it 🤷

uncut harbor Feb 16, 2023, 7:21 AM

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What do you mean ?

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you mind showing me a code ?

sand moat Feb 16, 2023, 7:22 AM

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void f(Wallet w1, Wallet w2) {
Wallet w3(w1.getQuarters() + w2.getQuarters(), w1.getDimes() + w2.getDimes(), w1.getNickles() + w2.getNickles(), w1.getCents() + w2.getCents());

    cout << endl
         << "W3:";
    cout << "\t" << w3.getQuarters() << " quarters" << endl;
    cout << "\t" << w3.getDimes() << " dimes" << endl;
    cout << "\t" << w3.getNickles() << " nickels" << endl;
    cout << "\t" << w3.getCents() << " cents" << endl;

    double total3 = ((w3.getQuarters() * 25 + w3.getDimes() * 10 + w3.getNickles() * 5 + w3.getCents()) / 100.0);
    cout << "\t--------> amount = $" << total3 << endl;
}

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It's just your code with void f(Wallet w1, Wallet w2) {} around it.

uncut harbor Feb 16, 2023, 7:24 AM

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Wallet addTwoWallets(Wallet w1, Wallet w2);

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This is a hint from the homework

sand moat Feb 16, 2023, 7:25 AM

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So just use addTwoWallets instead of f.

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And return w3; at the end.

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And you probably don't want to print it.

uncut harbor Feb 16, 2023, 7:30 AM

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Can I just have these line in the Function void f(Wallet w1, Wallet w2) {
Wallet w3(w1.getQuarters() + w2.getQuarters(), w1.getDimes() + w2.getDimes(), w1.getNickles() + w2.getNickles(), w1.getCents() + w2.getCents());

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And then I will print the wallet in the main ?

sand moat Feb 16, 2023, 7:31 AM

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Almost. w3 only lives inside f and you cannot access it from main. That's why addTwoWallets returns a Wallet.

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That way you can access the result later.

uncut harbor Feb 16, 2023, 7:34 AM

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I got errors

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What is your code if you do that way

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like Function to add 2 wallets

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and then print out the result at the main function

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?

sand moat Feb 16, 2023, 7:37 AM

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Like I said, you take the hint:
Wallet addTwoWallets(Wallet w1, Wallet w2)
The code:
Wallet w3(w1.getQuarters() + w2.getQuarters(), w1.getDimes() + w2.getDimes(), w1.getNickles() + w2.getNickles(), w1.getCents() + w2.getCents());
and the return:
return w3;
and that should be it.

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Well you also need the { and }.

uncut harbor Feb 16, 2023, 7:40 AM

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Let's say If we just have these line in the main function

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out << endl
<< "W3:";
cout << "\t" << w3.getQuarters() << " quarters" << endl;
cout << "\t" << w3.getDimes() << " dimes" << endl;
cout << "\t" << w3.getNickles() << " nickels" << endl;
cout << "\t" << w3.getCents() << " cents" << endl;

double total3 = ((w3.getQuarters() * 25 + w3.getDimes() * 10 + w3.getNickles() * 5 + w3.getCents()) / 100.0);
cout << "\t--------> amount = $" << total3 << endl;

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What's the function look like out side the main ?

sand moat Feb 16, 2023, 7:41 AM

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If you do it properly it should be std::ostream &operator<<(std::ostream &os, const Wallet &w).

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But void print(Wallet w) will do too.

uncut harbor Feb 16, 2023, 7:43 AM

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Could you show the code you do by the void print(Wallet w)

sand moat Feb 16, 2023, 7:43 AM

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I'm confused why you need that.

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void print(Wallet w) {
cout << endl
         << "W3:";
    cout << "\t" << w.getQuarters() << " quarters" << endl;
    cout << "\t" << w.getDimes() << " dimes" << endl;
    cout << "\t" << w.getNickles() << " nickels" << endl;
    cout << "\t" << w.getCents() << " cents" << endl;

    double total3 = ((w.getQuarters() * 25 + w.getDimes() * 10 + w.getNickles() * 5 + w.getCents()) / 100.0);
    cout << "\t--------> amount = $" << total3 << endl;
}

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There is no intelligence, it's just copy/paste.

uncut harbor Feb 16, 2023, 7:45 AM

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Maybe I misunderstood the requires of the homework

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I am also confused the questions on the homework from my professor too

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I know how to do it niw

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thank you for your helping

sand moat Feb 16, 2023, 7:46 AM

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Putting the printing into a function makes sense, because print(w2); print(w3); is a lot shorter than your previous code.

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And you'll also need print(w3);.

uncut harbor Feb 16, 2023, 7:47 AM

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Got it

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thank you

hearty haloBOT Feb 16, 2023, 7:52 AM

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@uncut harbor Has your question been resolved? If so, run !solved :)

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@uncut harbor

Please Do Not Delete Posts!

Please don't delete forum posts. They can be helpful to refer to later and other members can learn from them. In the future you can use !solved to close a post and mark a post as solved.

uncut harbor Feb 16, 2023, 8:00 AM

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!solved

#Classes and Function in C++