Created
April 15, 2015 17:10
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15 puzzle
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/* 15 puzzle */ | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <string.h> | |
#include <ctype.h> | |
#include <time.h> | |
typedef enum _Boolean { False = 0, True = -1 } Boolean; | |
Boolean confirm(char const *msg) { | |
char str[256]; | |
for (;;) { | |
if (msg != NULL) { | |
printf(msg); | |
} | |
printf(" [y/n]? "); | |
fgets(str, 256, stdin); | |
str[0] = tolower(str[0]); | |
if (str[0] == 'y') { | |
return True; | |
} else if (str[0] == 'n') { | |
return False; | |
} | |
} | |
} | |
void initPuzzle(int puzzle[4][4]) { | |
int i, j, n = 1; | |
for (i = 0; i < 4; i++) { | |
for (j = 0; j < 4; j++) { | |
puzzle[i][j] = n & 0xF; | |
n++; | |
} | |
} | |
} | |
Boolean checkPuzzle(int const puzzle[4][4]) { | |
int i, j, n = 1; | |
for (i = 0; i < 4; i++) { | |
for (j = 0; j < 4; j++) { | |
if (puzzle[i][j] != (n & 0xF)) { | |
return False; | |
} | |
n++; | |
} | |
} | |
return True; | |
} | |
int movePanels(int puzzle[4][4], int const number) { | |
int xs = -1, ys = -1, xn = -2, yn = -2; | |
int i, j, m; | |
for (i = 0; i < 4; i++) { | |
for (j = 0; j < 4; j++) { | |
if (puzzle[i][j] == number) { | |
xn = j; | |
yn = i; | |
} else if (puzzle[i][j] == 0) { | |
xs = j; | |
ys = i; | |
} | |
} | |
} | |
if (xs != xn && ys != yn) { | |
return 0; | |
} | |
if (xs > xn) { | |
for (j = xs; j > xn; j--) { | |
puzzle[ys][j] = puzzle[ys][j - 1]; | |
} | |
m = xs - xn; | |
} else if (xs < xn) { | |
for (j = xs; j < xn; j++) { | |
puzzle[ys][j] = puzzle[ys][j + 1]; | |
} | |
m = xn - xs; | |
} else if (ys > yn) { | |
for (i = ys; i > yn; i--) { | |
puzzle[i][xs] = puzzle[i - 1][xs]; | |
} | |
m = ys - yn; | |
} else /* if (ys < yn) */ { | |
for (i = ys; i < yn; i++) { | |
puzzle[i][xs] = puzzle[i + 1][xs]; | |
} | |
m = yn - ys; | |
} | |
puzzle[yn][xn] = 0; | |
return m; | |
} | |
void shuffle(int puzzle[4][4], int const times) { | |
int i, j, t; | |
int xs, ys; | |
int p, k = 0; | |
for (t = 0; t < times; t++) { | |
for (i = 0; i < 4; i++) { | |
for (j = 0; j < 4; j++) { | |
if (puzzle[i][j] == 0) { | |
xs = j; | |
ys = i; | |
goto loopescape; | |
} | |
} | |
} | |
loopescape: | |
p = rand() % 3; | |
if (k == 0) { | |
for (i = 0; i < 4; i++) { | |
if (puzzle[i][xs] == 0) { | |
continue; | |
} | |
if (p == 0) { | |
movePanels(puzzle, puzzle[i][xs]); | |
break; | |
} else { | |
p--; | |
} | |
} | |
} else { | |
for (j = 0; j < 4; j++) { | |
if (puzzle[ys][j] == 0) { | |
continue; | |
} | |
if (p == 0) { | |
movePanels(puzzle, puzzle[ys][j]); | |
break; | |
} else { | |
p--; | |
} | |
} | |
} | |
k = !k; | |
} | |
} | |
void printPuzzle(int const puzzle[4][4]) { | |
int i, j; | |
for (i = 0; i < 4; i++) { | |
for (j = 0; j < 4; j++) { | |
if (j > 0) { | |
putchar(' '); | |
} | |
if (puzzle[i][j] > 0) { | |
printf("%2d", puzzle[i][j]); | |
} else { | |
putchar(' '); | |
putchar('*'); | |
} | |
} | |
putchar('\n'); | |
} | |
} | |
Boolean game(void) { | |
Boolean complete = False; | |
int n, p, t, m; | |
int puzzle[4][4]; | |
char str[256]; | |
initPuzzle(puzzle); | |
shuffle(puzzle, 1000); | |
t = 0; | |
for (;;) { | |
loophead: | |
printf("---------------------- %d moves\n", t); | |
printPuzzle(puzzle); | |
printf("move number [1-15]? "); | |
fgets(str, 256, stdin); | |
for (p = 0; isprint(str[p]); p++) { | |
if (!isdigit(str[p])) { | |
if (confirm("do you give up") == True) { | |
puts("gave up"); | |
goto gameend; | |
} else { | |
goto loophead; | |
} | |
} | |
} | |
if (strlen(str) > 3) { | |
puts("illegal number"); | |
continue; | |
} | |
n = atoi(str); | |
m = movePanels(puzzle, n); | |
if (m == 0) { | |
if (n > 0 && n < 16) { | |
puts("cannot move"); | |
} else { | |
puts("illegal number"); | |
} | |
continue; | |
} else { | |
t += m; | |
} | |
if (checkPuzzle(puzzle) == True) { | |
printf("complete (total %d moves)", t); | |
complete = True; | |
goto gameend; | |
} | |
} | |
gameend: | |
return complete; | |
} | |
int main(void) { | |
srand((unsigned)time(NULL)); | |
puts("* 15 puzzle *"); | |
do { | |
if (game() == False) { | |
break; | |
} | |
} while (confirm("do you continue") == True); | |
return 0; | |
} |
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