1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
|
#include <stdio.h>
#include <stdlib.h>
int b[3][3]; /* board. 0: blank; -1: computer; 1: human */
//winning patter
int check_winner()
{
int i;
for (i = 0; i < 3; i++) {
if (b[i][0] && b[i][1] == b[i][0] && b[i][2] == b[i][0]) //vertical winning pattern
return b[i][0];
if (b[0][i] && b[1][i] == b[0][i] && b[2][i] == b[0][i]) //vertical winning attern
return b[0][i];
}
if (!b[1][1]) return 0;
//diagonal winning pattern 1
if (b[1][1] == b[0][0] && b[2][2] == b[0][0]) return b[0][0];
if (b[1][1] == b[2][0] && b[0][2] == b[1][1]) return b[1][1];
//diagonal winning pattern 2
if (b[0][0] == b[1][1] && b[1][1] == b[2][2]) return b[0][0];
if (b[2][0] == b[1][1] && b[1][1] == b[0][2]) return b[0][2];
return 0;
}
//definte X, O
void board()
{
const char *t = "X O";
int i, j;
for (i = 0; i < 3; i++, putchar('\n'))
for (j = 0; j < 3; j++)
printf("%c ", t[b[i][j] + 1]);
printf("-----\n");
}
//Construct 9x9 table
#define for_ij for (i = 0; i < 3; i++) for (j = 0; j < 3; j++)
int best_i, best_j;
int test_move(int val, int depth)
{
int i, j, score;
int best = -1, changed = 0;
if ((score = check_winner())) return (score == val) ? 1 : -1;
for_ij{
if (b[i][j]) continue;
changed = b[i][j] = val;
score = -test_move(-val,depth + 1);
b[i][j] = 0;
if (score <= best) continue;
if (!depth) {
best_i = i;
best_j = j;
}
best = score;
}
return changed ? best : 0;
}
const char* game(int user)
{
int i, j, k, move, win = 0;
for_ij b[i][j] = 0;
printf("Board postions are numbered so:\n1 2 3\n4 5 6\n7 8 9\n\n");
printf("\t\t\t You have O, Computer have X.\n\n");
for (k = 0; k < 9; k++, user = !user) {
while (user) {
//Player enters Move
printf("\t\t\t your move: ");
if (!scanf("%d", &move)) {
scanf("%*s");
continue;
}
if (--move < 0 || move >= 9) continue;
if (b[i = move / 3][j = move % 3]) continue;
b[i][j] = 1;
break;
}
//Computer's move
if (!user) {
if (!k) { /* Computer random moves*/
best_i = rand() % 3;
best_j = rand() % 3;
}
else
test_move(-1, 0);
b[best_i][best_j] = -1;
printf("My move: %d\n", best_i * 3 + best_j + 1);
}
//Decide winner
board();
if ((win = check_winner()))
return win == 1 ? "You win.\n\n" : "You lose.\n\n";
}
return "A draw.\n\n";
}
int main()
{
int first = 0;
while (1) printf("%s", game(first = !first));
return 0;
}
|
