Connect4

#include <iostream>

using namespace std;

int whichRow(char placement[9][7], int column);
int checkWinner(char board[9][7], char key);

int main()
{
    cout << "Welcome to Connect 4!\nPlayer 1 has 'O' tokens and Player 2 has 'X' tokens\nLet's get started!\n\n";

    //variable decleration
    char gameBoard[9][7];
    int colNum, player, count, row, winner = 0;
    char token[2] = {'O', 'X'};
    bool gameOver = false;


    //fills the gameboard
    for(int i = 0; i < 9; i++){//rows
        for(int j = 0; j < 7; j++){//columns
            gameBoard[i][j] = ' ';
        }//end for
    }//end for (fill array)

    count = 0;

    //loops for constant user input until checkWinner returns true
    while(gameOver == false){
        player = count%2;
        cout << "Player " << player +1 << ", Choose a column (1-7):";
        cin >> colNum;

        //prompts user to enter a number within the bounds of the board
        while(colNum > 7 || colNum < 1){
            cout << "\nThat column does not exist.\nEnter a different number:";
            cin >> colNum;
            // row = whichRow(gameBoard, colNum-1);
        }//end while

        row = whichRow(gameBoard, colNum-1);

        //prompts user to enter a different column # if selected column is full
        while(row == -1){
            cout << "That column is full. Please select another: ";
            cin >> colNum;
            row = whichRow(gameBoard, colNum-1);
        }//end while

        gameBoard[row][colNum-1] = token[player];

        //prints gameboard with tokens
        for(int i = 0; i < 9; i++){//rows
            cout << "|";
            for(int j = 0; j < 7; j++){//columns
                cout << gameBoard[i][j] << "|";
            }//end for
            cout << endl;
        }//end for

        cout << "=============== \n";
        winner = checkWinner(gameBoard, token[player]);

        //prints the winner
        if(winner == 1){
            cout << endl << "Player " << player+1 << " is the winner!!!\n";
            cout << "Congratulations, you win 50 coins!\n\n";
            for(int i = 0; i < 50; i++)
                cout << " coin ";
            cout << "\n\nWhat can you do with these virtual coins? Nothing!\nHave a great day!\n";
            break;
        }//end if Game Over

        //used to alternate player turns
        count++;
    }//end while


    return 0;
}//end main

//checks if there is a token in the selected column and returns the index of the row to place the new token
//checks for full rows and returns indicator to prompt user to enter a different row
int whichRow(char placement[9][7], int column){
    int i;
    for(i = 8; i >= 0; i--){
        if(placement[i][column] == ' ')
            return i;
        if(placement[0][column] != ' ')
            return -1;
    }//end for

    return i-1;
}//end whichRow


//checks for a winner after every turn and returns 'true' if there is a winner and 'false' if there is not
int checkWinner(char board[9][7], char key){
    //horizontal search
    for(int i = 0; i < 9; i++){//rows
        for(int j = 0; j < 4; j++){//columns
            if(board[i][j] == key && board[i][j+1] == key && board[i][j+2] == key && board[i][j+3] == key)
                return true;
        }//end for
    }//end for

    //vertical search
    for(int i = 0; i < 7; i++){//columns
        for(int j = 0; j < 6; j++){//rows
            if(board[j][i] == key && board[j+1][i] == key && board[j+2][i] && board[j+3][i] == key)
                return 1;
        }//end for
    }//end for

    //right slope search
    for(int i = 0; i < 6; i++){//rows
        for(int j = 0; j < 4; j++){//columns
            if(board[i][j] == key && board[i+1][j+1] == key && board[i+2][j+2] == key && board[i+3][j+3] == key)
                return 1;
        }//end for
    }//end for

    //left slope search
    for(int i = 0; i < 6; i++){//rows
        for(int j = 6; j > 2; j--){//columns
            if(key == board[i][j] && key == board[i+1][j-1] && key == board[i+2][j-2] && key == board[i+3][j-3])
                return 1;
        }//end for
    }//end for

    return 0;
}//end linSearch