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- /**
- * fifteen.c
- *
- * Implements Game of Fifteen (generalized to d x d).
- *
- * Usage: fifteen d
- *
- * whereby the board's dimensions are to be d x d,
- * where d must be in [DIM_MIN,DIM_MAX]
- *
- * Note that usleep is obsolete, but it offers more granularity than
- * sleep and is simpler to use than nanosleep; `man usleep` for more.
- */
- #define _XOPEN_SOURCE 500
- #include <cs50.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <unistd.h>
- // constants
- #define DIM_MIN 3
- #define DIM_MAX 9
- // board
- int board[DIM_MAX][DIM_MAX];
- // dimensions
- int d;
- // prototypes
- void clear(void);
- void greet(void);
- void init(void);
- void draw(void);
- bool move(int tile);
- bool won(void);
- int main(int argc, string argv[])
- {
- // ensure proper usage
- if (argc != 2)
- {
- printf("Usage: fifteen d\n");
- return 1;
- }
- // ensure valid dimensions
- d = atoi(argv[1]);
- if (d < DIM_MIN || d > DIM_MAX)
- {
- printf("Board must be between %i x %i and %i x %i, inclusive.\n",
- DIM_MIN, DIM_MIN, DIM_MAX, DIM_MAX);
- return 2;
- }
- // open log
- FILE *file = fopen("log.txt", "w");
- if (file == NULL)
- {
- return 3;
- }
- // greet user with instructions
- greet();
- // initialize the board
- init();
- // accept moves until game is won
- while (true)
- {
- // clear the screen
- clear();
- // draw the current state of the board
- draw();
- // log the current state of the board (for testing)
- for (int i = 0; i < d; i++)
- {
- for (int j = 0; j < d; j++)
- {
- fprintf(file, "%i", board[i][j]);
- if (j < d - 1)
- {
- fprintf(file, "|");
- }
- }
- fprintf(file, "\n");
- }
- fflush(file);
- // check for win
- if (won())
- {
- printf("ftw!\n");
- break;
- }
- // prompt for move
- printf("Tile to move: ");
- int tile = get_int();
- // quit if user inputs 0 (for testing)
- if (tile == 0)
- {
- break;
- }
- // log move (for testing)
- fprintf(file, "%i\n", tile);
- fflush(file);
- // move if possible, else report illegality
- if (!move(tile))
- {
- printf("\nIllegal move.\n");
- usleep(500000);
- }
- // sleep thread for animation's sake
- usleep(500000);
- }
- // close log
- fclose(file);
- // success
- return 0;
- }
- /**
- * Clears screen using ANSI escape sequences.
- */
- void clear(void)
- {
- printf("\033[2J");
- printf("\033[%d;%dH", 0, 0);
- }
- /**
- * Greets player.
- */
- void greet(void)
- {
- clear();
- printf("WELCOME TO GAME OF FIFTEEN\n");
- usleep(2000000);
- }
- /**
- * Initializes the game's board with tiles numbered 1 through d*d - 1
- * (i.e., fills 2D array with values but does not actually print them).
- */
- void init(void)
- {
- int n = d*d-1;
- int i, j;
- for(i = 0; i < d; i++){
- for(j = 0; j< d; j++){
- board[i][j] = n;
- n -=1;
- }
- }
- // Switching numbers 1 and 2 if d is an even num
- int x = d % 2;
- if((x== 0) && (i = d-1)){
- // Creating temporary variables to aid in number switching
- int temp[1];
- //Switching numbers 1 and 2
- temp[0] = board[i][j-3];
- board[i][j-3] = board[i][j-2];
- board[i][j-2] = temp[0];
- }
- }
- /**
- * Prints the board in its current state.
- */
- void draw(void)
- {
- for(int i = 0; i< d; i++){
- for(int j = 0; j< d; j++){
- //Printing underscore to create a blank space
- if(board[i][j] == 0){
- char hide = '_';
- printf(" %2c ", hide);
- }else
- {
- //Printing the numbers with spaces around it
- printf(" %2i ", board[i][j]);
- }
- }
- printf("\n\n");
- }
- }
- /**
- * If tile borders empty space, moves tile and returns true, else
- * returns false.
- */
- bool move(int tile)
- {
- for(int i = 0; i< d; i++){
- for(int j = 0; j< d; j++){
- //Find the hidden number
- if(board[i][j] == 0){
- //Find tile
- for(int a = 0; a< d; a++){
- for(int b = 0; b< d; b++){
- if(tile == board[a][b]){
- /*
- Switch position of tile with Hidden num
- Some temporary vaariables to aid in switching
- */
- int num1[1];
- int num2[1];
- //If Hidden num is to the right of tile
- if(board[a][b +1] == board[i][j]){
- num1[0] = board[i][j];
- num2[0] = board[a][b];
- board[i][j] = num2[0];
- board[a][b] = num1[0];
- return true;
- //If Hidden num is to the left of tile
- }else if(board[a][b -1] == board[i][j]){
- num1[0] = board[i][j];
- num2[0] = board[a][b];
- board[i][j] = num2[0];
- board[a][b] = num1[0];
- return true;
- //If Hidden num is below tile position
- }else if(board[a-1][b] == board[i][j]){
- num1[0] = board[i][j];
- num2[0] = board[a][b];
- board[i][j] = num2[0];
- board[a][b] = num1[0];
- return true;
- //If Hidden num is on top of tile
- }else if(board[a+1][b] == board[i][j]){
- num1[0] = board[i][j];
- num2[0] = board[a][b];
- board[i][j] = num2[0];
- board[a][b] = num1[0];
- return true;
- }
- }
- }
- }
- }
- }
- }
- return false;
- }
- /**
- * Returns true if game is won (i.e., board is in winning configuration),
- * else false.
- */
- bool won(void)
- {
- for(int i= 0; i< d; i++){
- for(int j= 1; j< d; j++){
- //Are the tiles in ascending order?
- if(board[i][j-1] > board[i][j]){
- return false;
- }
- }
- }
- return false;
- }
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