Gettina a Segmentation fault runtime error.

[Jfunch]

I keep getting a Segmentation fault error when i run my program, i read that this is an error with memory or somthing, i was hoping someone could point out where the problem in my program is. My code is below.

#include <iostream>
#include <vector>

using namespace std;

class sequence
{

public:
        void read();

        int print(vector<int>&) const;

        int getelement(sequence x,int i);

        sequence();

        sequence(int s);
private:
        int next;

        vector<int> v2;
};





int main(){
        sequence x;
        x.read();
        int element;
        int i;
        cout << "please enter the element you would like returned." << endl;
        cin >> i;
        element = x.getelement(x,i);
        return 0;
}

sequence :: sequence()
{



}
sequence:: sequence(int s)
{
        vector<int> v2(s);

}
void sequence::read()
{
        vector<int> v2;
        int s;
        cout << "Enter the number of integers" << endl;
        cin >> s;
        cout << "Enter your sequence, place a negative number at end." << endl;
        cin >> next;

        while(next > 0)
        {

                v2.push_back(next);
                cin >> next;
        }
         for(unsigned int i = 0; i < v2.size(); i++)
        {
                cout << v2[i];
        }


}
int sequence::print(vector<int>&)const
{


        for(unsigned int i = 0; i < v2.size(); i++)
        {
                cout << v2[i];
        }
}
int sequence::getelement(sequence x,int i)
{
        int a;
        return x.v2[a];
}

[c++sux]

what compiler are you using?
Most compilers allow a step through compilation process where you can compile a line of code at a time. This is useful as when it gets to a line with an error it will tell you and BAM theres your problem!

Seg faults are usually caused when you access memory that doesnt belong to you.
Example : an array
char ARRAY[10] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
cout << ARRAY [25];
will seg fault as your accessing a part of memory that doesnt belong to your program.

I dont know for sure but id recommend commenting out your print function as it has a for loop that may be accessing memory that is not assigned to your program! But definently go look debugger commands if ur using linux g++
or google how to compile step by step with your compiler

[pecet]

Use code tags.

Probably your problem is in void sequence::read() method. You store some data to local vector<int> v2, then you try to read from sequence::v2, but this is completly another vector. And since it's not populated, you get seg fault.
There are some other issues in code. You shuold get good book about OO programming.