Forum: Programmerings lek

#include <iostream>
#include <vector>
#include <sstream>
#include <map> // for pair
 
using namespace std;
 
pair<unsigned int, unsigned int> get_size(vector<vector<double> > v);
vector<vector<double> > make_matris();
void print_matris(vector<vector<double> > v);
 
int main()
{
    vector< vector<double> > matrisA = make_matris();
    vector< vector<double> > matrisB = make_matris();
 
    cout << "Resultat: " << endl;
 
    pair<unsigned int, unsigned int> sizeA, sizeB;
    sizeA = get_size(matrisA);
    sizeB = get_size(matrisB);
 
    if (sizeA.second != sizeB.first)
    {
        // Odefinierat.
        cout << "Odefinierat" << endl;
        return 1;
    }
 
    vector<vector<double> > res;
 
    for (unsigned int h = 0; h < matrisA.size(); h++)
    {
        vector<double> line;
        for (unsigned int w = 0; w < matrisB[0].size(); w++)
        {
            double val = 0;
            /* ------------------------------- */
            /* Line: A:h, col B:w */
            /* ------------------------------- */
 
            /** 0 to width of matris A **/
            for (unsigned int c = 0; c < matrisA[h].size() ; c++)
            {
                val += (matrisA[h][c] * matrisB[c][w]);
            }
 
            line.push_back(val);
        }
        res.push_back(line);
    }
    print_matris(res);
    return 0;
}
 
pair<unsigned int, unsigned int> get_size(vector<vector<double> > v)
{
    unsigned int max_w = 1;
    vector< vector<double> >::const_iterator i;
    for (i = v.begin(); i != v.end(); i++)
    {
        if ((*i).size() >= max_w)
            max_w = (*i).size();
    }
    return make_pair(v.size(),max_w);
}
 
vector<vector<double> > make_matris()
{
    vector<vector<double> > m;
    string input;
    cout << "Mata in matris:" << endl;
    do
    {
        vector<double> line;
        double tmp;
        getline(cin, input);
 
        /* Only valid if input is not empty */
        if (input != "")
        {
            istringstream l(input);
            while (l >> tmp)
                line.push_back(tmp);
            m.push_back(line);
        }
 
    }
    while (input != "");
    return m;
}
 
void print_matris(vector<vector<double> > v)
{
    vector<vector<double> >::const_iterator h;
    for (h = v.begin(); h != v.end(); h++)
    {
        vector<double>::const_iterator w;
        for (w = (*h).begin(); w != (*h).end(); w++)
        {
            cout << (*w) << " ";
        }
        cout << endl;
    }
}