void add(vector<int>& data, vector<string>& names)
{
    //some constants to make modifying the prompts a bit more simple.
    //note on the variable names: I use prefix notation, ergo
    //"agoals" stands for "Away goals", that is, goals made by the away team
    // prefix "h" is "home".
    const string NOTINT="Your input could not be converted to a sensible number! Make sure your input is a non-negative integer!";
    const string TOOLONG="Your input was too long! Please make sure that the name you input is, at maximum, 8 characters.";
    const string HNAMEPROMPT="Please input the name of the home team: ";
    const string ANAMEPROMPT="Please input the name of the away team: ";
    const string HGOALPROMPT= "Please input the number of goals made by the home team: ";
    const string AGOALPROMPT= "Please input the number of goals made by the away team: ";
    //temporary variable so I can do things to user input when needed
    string input="";
    //variable for storing the name of home team. Made nine characters long
    //because of the incoming while-loop
    string hname="         ";
    //same as above, for away team
    string aname="         ";
    //homegoals, initialization for incoming loops
    int hgoals=-1;
    //awaygoals, same as above
    int agoals=-1;
    //some slave variables so calculations don't have to be done a million times per
    //iteration of the function
    int helper1 = 0;
    int helper2 = 0;
    //this is why I initialized the names as I did.
    //I want the names to be at max 8 long, and the
    //program will keep pestering the user until it gets something
    //less or equal than eight characters
    while(hname.size()>8)
    {
        cout << HNAMEPROMPT;
        cin >> hname;
        if(hname.size>8)
        {
            //print error message if too long string
            cout TOOLONG; << endl;
        }
    }
    //same as above, only for away team's name
    while(aname.size()>8)
    {
        cout << ANAMEPROMPT;
        cin >> aname;
        if(aname.size>8)
        {
            cout TOOLONG; << endl;
        }
    }
    //parseint function used in this loop returns -1
    //if bullshit happens, so we'll keep pestering until
    //bullshit doesn't happen
    while(hgoals==-1)
    {
        cout << HGOALPROMPT;
        cin >> input;
        hgoals = parseInt(input);
        //if after attempting to make input into int it still remains
        //at error value, print error
        if(hgoals<0)
        {
            cout << NOTINT;
        }
    }
    //same as above while loop
    while(agoals==-1)
    {
        cout << AGOALPROMPT;
        cin >> input;
        agoals = parseInt(input);
        if(hgoals<0)
        {
            cout << NOTINT;
        }
    }
    //three simple, self-explanotary if-clauses
    if(hgoals>agoals)
    {
        cout << hname << " Won! Final score: " << hgoals << " - " << agoals;
    }
    if(hgoals<agoals)
    {
        cout << aname << " Won! Final score: " << hgoals << " - " << agoals;
    }
    if(hgoals==agoals)
    {
        cout << "The match was a draw! Final score: " << hgoals << " - " << hgoals;
    }
    //format() makes sure that input is in same format every time:
    //capital letter at the start, rest lowercase.
    //there are issues with it that I do not know how to solve
    format(hname);
    //exists(a,b) searches string vector
    //a for the string b, and returns the index
    //of b if found. If not, returns -1
    helper1=exists(names, hname);
    helper2=exists(names,aname);
    //if name is not found in "names", means it doesn't exist yet. Add the needed info
    //IMPORTANT NOTE ABOUT DATA FORMATTING!!!
    //names of teams are stored in one function
    //and data in another.
    //the order of the data, starting from index 0
    //is as follows
    //
    //0: overall points of team
    //1: overal wins
    //2: -||- losses
    //3: -||- draws
    //4: -||- goals scored
    //5: -||- goals suffered
    //
    //thus, any information of a team at
    //index i of "names" vector
    // can be accessed by multiplying i by 6
    //and adding tthe wanted number between 0 and 5
    if(helper1 == -1)
    {
        //helper1==-1, that means home team doesn't exist in the name list yet
        //add the dataset described above. Note that win scores you 3 points, draw 1 and loss 0
        if(hgoal>agoal)
        {
            data.push_back(3);
            data.push_back(1);
            data.push_back(0);
            data.push_back(0);
            data.push_back(hgoals);
            data.push_back(agoals);
        }
        if(hgoal<agoal);
        {
            data.push_back(0);
            data.push_back(0);
            data.push_back(1);
            data.push_back(0);
            data.push_back(hgoals);
            data.push_back(agoals)
        }
        if(hgoal==agoal);
        {
            data.push_back(0);
            data.push_back(0);
            data.push_back(1);
            data.push_back(0);
            data.push_back(hgoals);
            data.push_back(agoals)
        }
    }
    //same as above. Helper2 is away team, so info is fed accordingly
    if(helper2 == -1)
    {
        if(hgoal>agoal)
        {
            data.push_back(0);
            data.push_back(0);
            data.push_back(0);
            data.push_back(1);
            data.push_back(hgoals);
            data.push_back(agoals);
        }
        if(hgoal<agoal);
        {
            data.push_back(3);
            data.push_back(1);
            data.push_back(0);
            data.push_back(0);
            data.push_back(hgoals);
            data.push_back(agoals)
        }
        if(hgoal==agoal);
        {
            data.push_back(1);
            data.push_back(0);
            data.push_back(1);
            data.push_back(0);
            data.push_back(hgoals);
            data.push_back(agoals)
        }
    }
    if(helper1 != -1 && helper2 !=-1)
    {
        //both teams exist because helpers are both != -1
        //so info is fed in with the formula described at the start of this function
        data[helper1*6+4]=data[helper1*6+4]+hgoals;
        data[helper2*6+4]=data[helper2*6+4]+agoals;
        data[helper1*6+5]=data[helper1*6+5]+agoals;
        data[helper2*6+5]=data[helper2*6+5]+hgoals;
        if(hgoal>agoal)
        {
            data[helper1*6]=data[helper1*6]+3;
            data[helper1*6+1]=data[helper1*6+1]+1;
            data[helper2*+2]=data[helper2*+2]+1
        }
        if(hgoal<agoal)
        {
            data[helper2*6]=data[helper2*6]+3;
            data[helper2*6+1]=data[helper2*6+1]+1;
            data[helper1*+2]=data[helper1*+2]+1
        }
        if(hgoal==agoal);
        {
            data[helper1*6]=data[helper1*6]+1;
            data[helper2*6]=data[helper2*6]+1;
            data[helper1*6+3]=data[helper1*6+3]+1;
            data[helper2*6+3]=data[helper2*6+3]+1;
        }
    }
}