Tryggvi

#include <iostream>

using namespace std;

void inputter(int inntak,char alpha[9], char stafur)
{
    alpha[inntak-1] = stafur;
}

char stafbreytir(char stafur)
{
    if(stafur=='O')
    {
        stafur='X';
    }
    else if(stafur=='X')
    {
        stafur='O';
    }
    return stafur;
}

int checker(char alpha[9])
{
    char winner;
    if((alpha[0]=='X' && alpha[4]=='X' && alpha[8]=='X')||(alpha[2]=='X' && alpha[4]=='X' && alpha[6]=='X'))//Ská X
    {
        winner = 'X';
    }
    else if((alpha[0]=='O'&&alpha[4]=='O'&&alpha[8]=='O')||(alpha[2]=='O'&&alpha[4]=='O'&&alpha[6]=='O'))//Ská O
    {
        winner = 'O';
    }
    else if((alpha[0]=='X'&&alpha[1]=='X'&&alpha[2]=='X')||(alpha[3]=='X'&&alpha[4]=='X'&&alpha[5]=='X')||(alpha[6]=='X'&&alpha[7]=='X'&&alpha[8]=='X'))//lóðrétt X
    {
        winner = 'X';
    }
    else if((alpha[0]=='O'&&alpha[1]=='O'&&alpha[2]=='O')||(alpha[3]=='O'&&alpha[4]=='O'&&alpha[5]=='O')||(alpha[6]=='O'&&alpha[7]=='O'&&alpha[8]=='O'))//lóðrétt O
    {
        winner = 'O';
    }
    else if((alpha[0]=='X'&&alpha[3]=='X'&&alpha[6]=='X')||(alpha[1]=='X'&&alpha[4]=='X'&&alpha[7]=='X')||(alpha[2]=='X'&&alpha[5]=='X'&&alpha[8]=='X'))//Lárett X
    {
        winner = 'X';
    }
    else if((alpha[0]=='O'&&alpha[3]=='O'&&alpha[6]=='O')||(alpha[1]=='O'&&alpha[4]=='O'&&alpha[7]=='O')||(alpha[2]=='O'&&alpha[5]=='O'&&alpha[8]=='O'))//Lárett O
    {
        winner = 'O';
    }
    else
    {
        winner = 'N';
    }
    return winner;
}

int input(char stafur, char alpha[9])
{
    int inntak,teljari=0;
    while(teljari < 10)
    {
    cout << stafur << " position: ";
    cin >> inntak;
    if(!isdigit(inntak))
    {
        cin.clear();
        cin.ignore(100, '\n');
        cout << "Illegal move!" << "bug" << endl;
    }
    else if(alpha[inntak-1] == 'X' || alpha[inntak-1] == 'O'||inntak > 9)
    {
        cout << "Illegal move!" << endl;
        inntak = 0;
    }
    else
    {
        teljari = 10;
    }
    }
    return inntak;
}

void drawer(char alpha[8])
{
    int data[9]={1,2,3,4,5,6,7,8,9};
    for(int i=0;i < 9;i++)
    {
        if(i == 2||i == 5)
        {
            if(alpha[i] == 'X'||alpha[i] == 'O')
            {
                cout << alpha[i] << " \n";
            }
            else
            {
                cout << data[i] << " \n";
            }
        }
        else
        {
            if(alpha[i] == 'X'||alpha[i] == 'O')
            {
                cout << alpha[i] << " ";
            }
            else
            {
                cout << data[i] << " ";
            }
        }
    }
    cout << endl;
}

int main()
{
    char alpha[9]={'E','E','E','E','E','E','E','E','E'};
    char stafur = 'O', winner;
    int inntak, teljari = 0;

    while(teljari < 10)
    {
    drawer(alpha);
    stafur = stafbreytir(stafur);
    inntak = input(stafur,alpha);
    inputter(inntak,alpha,stafur);
    winner = checker(alpha);
    if(winner=='O'||winner=='X')
    {
        drawer(alpha);
        cout << "Winner is: " << winner << endl;
        teljari=10;
    }
    }
    return 0;
}