Please help me complete the fourInARow() function of this Connect Four code. Thanks. The code is below:

#include  // only difference is on lines 93 and 95 // we will not check for "4 in a row", so you can use either code using namespace std; const int RSIZE = 6; const int CSIZE = 7; const char BLANK = '.'; const char P1 = 'X'; const char P2 = 'O'; char winner(char board[RSIZE][CSIZE]); string play(char board[RSIZE][CSIZE], int col, char who); bool fourInARow(char board[RSIZE][CSIZE], int i, int j, int dr, int dc); void print(char board[RSIZE][CSIZE]); int main() { char board[RSIZE][CSIZE]; for(int i=0; i< RSIZE; i++) { for(int j=0; j < CSIZE; j++) { board[i][j] = BLANK; } } string message = ""; char player = P2; while( !winner(board)) { if(player == P2 && message == "") // rotate player turns { player = P1; } else if(player == P1 && message == "") { player = P2; } print(board); cout << message << endl; message = ""; cout << "Which column do you wish to play in? "; char ans; cin >> ans; string dump; getline(cin, dump); if('1' <= ans && ans <= '7') { message = play(board,ans-'1', player); } else { message = "Not a valid move, try again..."; } } print(board); cout << endl; if(winner(board) == P1) { cout << "The mighty " << P1 << "s reign supreme! "; } else if(winner(board) == P2) { cout << "The " << P2 << "s have completed world domination! "; } else if(winner(board) == BLANK) { cout << "Zzzzzzzzzzzzz... draw "; } else { cout << "Derp... something went wrong!"; } } char winner(char board[RSIZE][CSIZE]) { int blanks = 0; for(int i=0; i< RSIZE; i++) { for(int j=0; j < CSIZE; j++) // loop through all cells on board { if(board[i][j] == BLANK) // count how many blanks { blanks++; } for(int k=2; k < 6; k++) // check all four directions (up/down, left/right, up-right/down-left, up-left/down-right). { int dr=k/3, dc=3+dr-k ; // dr & dc change in row/column. so up/down means dr=1, dc=0 if(board[i][j] != BLANK && fourInARow(board,i,j,dr,dc)) // if 4 in a row (or more) return which player won (char) { return board[i][j]==P1?P1:P2; } } } } if(blanks == 0) // board full and no winner { return BLANK; } else // still going! { return 0; } } bool fourInARow(char board[RSIZE][CSIZE], int i, int j, int dr, int dc) { // FILL ME IN FOR PART B! return 0; } string play(char board[RSIZE][CSIZE], int col, char who) { for(int i=RSIZE-1; i >= 0; i--) { if(board[i][col] == BLANK) { board[i][col] = who; return ""; } } return "That column is full (idiot)."; } void print(char board[RSIZE][CSIZE]) { cout << " "; for(int i=0; i < RSIZE; i++) { for(int j=0; j < CSIZE; j++) { cout << board[i][j]; } cout << endl; } for(int i=1;i<8;i++) { cout << i; } cout << endl; }