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Arquivotheca.SunOS-4.1.4/games/backgammon/odds.c
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2021-10-11 18:37:13 -03:00

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#ifndef lint
static char sccsid[] = "@(#)odds.c 1.1 94/10/31 SMI"; /* from UCB 4.1 82/05/11 */
#endif
#include "back.h"
odds (r1,r2,val)
register int r1;
int r2, val;
{
register int i, j;
if (r1 == 0) {
for (i = 0; i < 6; i++)
for (j = 0; j < 6; j++)
table[i][j] = 0;
return;
} else {
r1--;
if (r2-- == 0)
for (i = 0; i < 6; i++) {
table[i][r1] += val;
table[r1][i] += val;
}
else {
table[r2][r1] += val;
table[r1][r2] += val;
}
}
}
count () {
register int i;
register int j;
register int total;
total = 0;
for (i = 0; i < 6; i++)
for (j = 0; j < 6; j++)
total += table[i][j];
return (total);
}
canhit (i,c)
int i, c;
{
register int j, k, b;
int a, d, diff, place, addon, menstuck;
if (c == 0)
odds (0,0,0);
if (board[i] > 0) {
a = -1;
b = 25;
} else {
a = 1;
b = 0;
}
place = abs (25-b-i);
menstuck = abs (board[b]);
for (j = b; j != i; j += a) {
if (board[j]*a > 0) {
diff = abs(j-i);
addon = place+((board[j]*a > 2 || j == b)? 5: 0);
if ((j == b && menstuck == 1) &&
(j != b && menstuck == 0))
for (k = 1; k < diff; k++)
if (k < 7 && diff-k < 7 &&
(board[i+a*k]*a >= 0 ||
board[i+a*(diff-k)] >= 0))
odds (k,diff-k,addon);
if ((j == b || menstuck < 2) && diff < 7)
odds (diff,0,addon);
}
if (j == b && menstuck > 1)
break;
}
return (count());
}