I wrote this a couple months ago and just wanted to get some feedback on it. In the printBoard()
function, you see I commented out the system function. I've read this is considered bad practice. Does anyone know of any alternative to clearing the terminal window? I thought it'd be a nice touch to clear the window instead of just having the updated board appear below the previous.
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define BOARD_ROWS 6
#define BOARD_COLS 7
void printBoard(char *board);
int takeTurn(char *board, int player, const char*);
int checkWin(char *board);
int checkFour(char *board, int, int, int, int);
int horizontalCheck(char *board);
int verticalCheck(char *board);
int diagonalCheck(char *board);
int main(int argc, char *argv[]){
const char *PIECES = "XO";
char board[BOARD_ROWS * BOARD_COLS];
memset(board, ' ', BOARD_ROWS * BOARD_COLS);
int turn, done = 0;
for(turn = 0; turn < BOARD_ROWS * BOARD_COLS && !done; turn++){
printBoard(board);
while(!takeTurn(board, turn % 2, PIECES)){
printBoard(board);
puts("**Column full!**\n");
}
done = checkWin(board);
}
printBoard(board);
if(turn == BOARD_ROWS * BOARD_COLS && !done){
puts("It's a tie!");
} else {
turn--;
printf("Player %d (%c) wins!\n", turn % 2 + 1, PIECES[turn % 2]);
}
return 0;
}
void printBoard(char *board){
int row, col;
//system("clear");
puts("\n ****Connect Four****\n");
for(row = 0; row < BOARD_ROWS; row++){
for(col = 0; col < BOARD_COLS; col++){
printf("| %c ", board[BOARD_COLS * row + col]);
}
puts("|");
puts("-----------------------------");
}
puts(" 1 2 3 4 5 6 7\n");
}
int takeTurn(char *board, int player, const char *PIECES){
int row, col = 0;
printf("Player %d (%c):\nEnter number coordinate: ", player + 1, PIECES[player]);
while(1){
if(1 != scanf("%d", &col) || col < 1 || col > 7 ){
while(getchar() != '\n');
puts("Number out of bounds! Try again.");
} else {
break;
}
}
col--;
for(row = BOARD_ROWS - 1; row >= 0; row--){
if(board[BOARD_COLS * row + col] == ' '){
board[BOARD_COLS * row + col] = PIECES[player];
return 1;
}
}
return 0;
}
int checkWin(char *board){
return (horizontalCheck(board) || verticalCheck(board) || diagonalCheck(board));
}
int checkFour(char *board, int a, int b, int c, int d){
return (board[a] == board[b] && board[b] == board[c] && board[c] == board[d] && board[a] != ' ');
}
int horizontalCheck(char *board){
int row, col, idx;
const int WIDTH = 1;
for(row = 0; row < BOARD_ROWS; row++){
for(col = 0; col < BOARD_COLS - 3; col++){
idx = BOARD_COLS * row + col;
if(checkFour(board, idx, idx + WIDTH, idx + WIDTH * 2, idx + WIDTH * 3)){
return 1;
}
}
}
return 0;
}
int verticalCheck(char *board){
int row, col, idx;
const int HEIGHT = 7;
for(row = 0; row < BOARD_ROWS - 3; row++){
for(col = 0; col < BOARD_COLS; col++){
idx = BOARD_COLS * row + col;
if(checkFour(board, idx, idx + HEIGHT, idx + HEIGHT * 2, idx + HEIGHT * 3)){
return 1;
}
}
}
return 0;
}
int diagonalCheck(char *board){
int row, col, idx, count = 0;
const int DIAG_RGT = 6, DIAG_LFT = 8;
for(row = 0; row < BOARD_ROWS - 3; row++){
for(col = 0; col < BOARD_COLS; col++){
idx = BOARD_COLS * row + col;
if(count <= 3 && checkFour(board, idx, idx + DIAG_LFT, idx + DIAG_LFT * 2, idx + DIAG_LFT * 3) || count >= 3 && checkFour(board, idx, idx + DIAG_RGT, idx + DIAG_RGT * 2, idx + DIAG_RGT * 3)){
return 1;
}
count++;
}
count = 0;
}
return 0;
}