Reading 2 diffrent lines into array

[youknowitsme]

Hello there, I wrote a code that uses algorithm of bubble sorting, but it works only if I input one line (set) of numbers like:

4(how many numbers I want to sort) 45 6 78 12 <numbers to sort
3 45 67 12 <another example

Here is how input and output should look


INPUT:
6 3 4 1 2 6 5

6 8 2 2 6 4 3

OUTPUT:
3 1 4 2 6 5
3 1 2 4 6 5
3 1 2 4 5 6
1 3 2 4 5 6
1 2 3 4 5 6
result:
1 2 3 4 5 6

2 8 2 6 4 3
2 2 8 6 4 3
2 2 6 8 4 3
2 2 6 4 8 3
2 2 6 4 3 8
2 2 4 6 3 8
2 2 4 3 6 8
2 2 3 4 6 8
result:
2 2 3 4 6 8

And here is my code:

#include <iostream>

using namespace std;

int main()
{
    bool changed = true;
    int size;
    int *tab = 0;
    tab = new int[size];

    cin >> size;
    tab[0] = size;

    cin.getline (tab,size);

    do
    {
        changed = false;
        for (int i = 1; i < size; ++i)
        {
                if (tab[i] > tab[i + 1])
                {
                    swap(tab[i], tab[i + 1]);
                    for (int p = 1; p <= size; p++)
                    cout << tab[p] << " ";

                    cout << "\n";
                    changed = true;
                }

        }

    }while(changed);

    cout << "result: \n";
    for (int p = 1; p <= size; p++)
    cout << tab[p] << " ";
}

INPUT/OUTPUT of my program

INPUT:
6 3 4 1 2 6 5

6 8 2 2 6 4 3

OUTPUT:
3 1 4 2 6 5
3 1 2 4 6 5
3 1 2 4 5 6
1 3 2 4 5 6
1 2 3 4 5 6
result:
1 2 3 4 5 6

It works when I put 2 lines in input but it calculates only first set, second is ignored. How to make it reading more than 1 set that user inputs? I can't find an answer since some days and it's eating me. Thanks for advance nad please use some easy strategy, some people were saying about vectors and stuff but I have no idea how to use it. Basically I want it to read each set of numbers put it into some array maybe? And then loop is doing job for each of arrays... How to make that?

[mike246]

Try a 2D array

int intArray[ 2 ][ 50 ]

This can then hold two sets of up to 50 different integers, you can then pass each set individually to a bubble sort function.

Also, it would be easier to not prompt the user for the number of integers in each list, instead let the user keep entering integers until a senital value is entered (like -1 for example).

If you don't know how to use 2D arrays, here's an article
http://www.cplusplus.com/forum/articles/7459/

[youknowitsme]

The thing is I can get 2 or more maybe 6 or 4 sets to test, depends how an internal application wants to test my application. Also senital value isn't an option, I have to do it like it's shown. User input one set, and every new set in new line. Any other ideas?

[youknowitsme]

Nevermind, solved this, topic to close.