c++ oop homework help ??

[kapoor]

I have c++ homework due tomorrow and need help.. i tried learning online but no help.. if anyone can help , please do . basically i have to write the class and functions for the main function.. and idk where to start. i paid attention but still very confusing.

1. Complete the program. Sort the cards in order least to greatest

int main() {
vector<Card> cards(5);
cards[0].setNumber (2);
cards[1].setNumber(6);
cards[2].setNumber(10);
cards[3].setNumber(7);
cards[4].setNumber(5);

sort_cards(cards);
print_cards(cards);
return 0;
}

[JayhawkZombie]

I have no idea why I'm still awake.

But alas, I am.

Do you have a class declaration given to you?
Giving you this program and saying "complete it" is very vague.

What have you tried so far?

[kapoor]

no i don't have a class declaration.. my professor just told me to write the header files and class for the main program.. and I'm confused as how to start it

[JayhawkZombie]

That's unusual, but alright.

Well, from what I can see, it looks like there is only one class used here - "cards".
What sort of member variables does it look like it has? What sort of functions does it look like it has? are "sort_cards" and "print_cards" member functions or just functions that take a "cards" object?

[kapoor]

sort and print are just regular functions using sort from <algorithm> library

[kapoor]

here is what i did so far:
#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;


void sort_cards( vector<int> cards){

sort(cards.begin(), cards.begin() + 4);

}

class Card{
public:
vector<int> cards;

void setNumber (int x) {
cards.push_back(x);
}

};

int main() {
vector<Card> cards(5);
cards[0].setNumber (2);
cards[1].setNumber(6);
cards[2].setNumber(10);
cards[3].setNumber(7);
cards[4].setNumber(5);

sort_cards(cards);
print_cards(cards);
return 0;
}

[JayhawkZombie]

Alright. The sort looks OK, except for one thing:

sort(cards.begin(), cards.begin() + 4);
You might want to change that '4' to cards.size();. There are actually 5 cards, not 4.

Do you have sample output for the "print_cards" function? What is the output supposed to looks like?

[kapoor]

the output is just the numbers in order .. like 2,5,6,7,10

[kapoor]

also I'm confused as to whether the class name should be called Card or cards

[JayhawkZombie]

vector<Card>. You put the type name in <>.

[kapoor]

my professor wrote that code .. maybe it's a typedef? like for every int , the alias would be Card ? or am I wrong

[JayhawkZombie]

A vector can store anything - it uses templates.

If you want to have a vector of integers, you can use vector<int>.
If you want a vector of strings, you can use vector<string>

There's a bit about templates that I'd have to talk about to really explain it, but a vector can hold any class/item (as long as it is instantiable). But you have to tell it what it is holding by putting the type (class name) inside the '<>'.