2-D vectors..string2int

From: Rich (dodd004_at_csusm.edu)
Date: 07/31/04 

Date: 31 Jul 2004 09:57:30 -0700

HI,

I am working on a program which implements the simplex aglorithm. I
have decided to use a vector of vectors to set up my matrix. My
initial thought was to fill the row vector with type string, then
convert all but the operator(<=,>=,=) column to type int. This is
proving a bit harder then I thought. I thought the member function
atoi() did this, but I'm having problems. I'm also having some
problems with this code that I have been working on. I am able to fill
the first row, but that's about it. It seems to skip all but the first
iteration. Do I need to flush the stream buffer? Any tips on the
conversion from string to int(is it possible)? I'm a new user and
appreciate any input at all. Thanks for your time, this has sure taken
up some of mine. I'm compiler on Unix AIX 5.1

class TheMatrix
{
        public:
                vector <string> P;
                vector< vector<string> > M;
                
        ~TheMatrix();
                void ReadIn();
                void AsktoReadIn();
};

// Deconstructor
TheMatrix::~TheMatrix()
{}

void TheMatrix::ReadIn()
{
string eqn;
string temp;

{
cout<<"Enter an equation:\n" << endl;
getline(cin, eqn);
istringstream ins;
ins.str(eqn);
        string eqn;
        string temp;
        
        {
                cout<<"Enter an equation:\n" << endl;
                getline(cin, eqn);
                istringstream ins;
                ins.str(eqn);

                //vector <string> X;

                while (ins >> temp)
                {
                
                        P.push_back(temp);
                
                }
                M.push_back(P);
        }
        

}

void TheMatrix::AsktoReadIn()
{
        char ch;
        //ReadIn();
        do
        {
                
                ReadIn();
                cout << "another equation?";
                cin >> ch; //seems to be skipping by this???
        }while (ch=='y');

        for (int i = 0; i < M.size(); i++)
        {
                for (int j = 0; j < P.size(); j++)
                {
                        cout << P[j] << " ";
                }
                
        }

}

int main()
{
        TheMatrix A;
            A.AsktoReadIn();
        return 0;

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