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check_and_flipover.c
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#include <stdio.h>
//extern int gameboard[9][9]; //use gameboard[1][1]~gameboard[8][8]
unsigned long long shift(int i, int j)
{
unsigned long long temp=1;
return temp<<(((8-i)<<3)+(8-j));
}
int check_legal_flip(int row, int column, int color, int flip, unsigned long long *my_board, unsigned long long *opponent_board)
{
int legal=0;
int opponent_color;
int i,j;
unsigned long long int temp=1;
unsigned long long board[3];
if(color==1)
opponent_color=2;
else
opponent_color=1;
board[color]=*my_board;
board[opponent_color]=*opponent_board;
/*check empty*/
// if(gameboard[row][column]!=0)
// return legal;
if((board[1]&shift(row,column))!=0 || (board[2]&shift(row,column))!=0)
return legal; //return 0;
/*check up*/
for(i=row-1;i>0;--i)
if((board[opponent_color]&shift(i,column))==0){
// printf("%llx\n",board[color]);
if((board[color]&shift(i,column))!=0 && i!=row-1){
legal=1;
if(flip==0)
return legal;
for(j=i+1;j<row;++j){
// gameboard[j][column]=color;
board[color]|=shift(j,column);
board[opponent_color]&=~shift(j,column);
}
}
break;
}
/*check down*/
for(i=row+1;i<=8;++i)
if((board[opponent_color]&shift(i,column))==0){
if((board[color]&shift(i,column))!=0 && i!=row+1){
legal=1;
if(flip==0)
return legal;
for(j=i-1;j>row;--j){
// gameboard[j][column]=color;
board[color]|=shift(j,column);
board[opponent_color]&=~shift(j,column);
}
}
break;
}
/*check right*/
for(i=column+1;i<=8;++i)
if((board[opponent_color]&shift(row,i))==0){
if((board[color]&shift(row,i))!=0 && i!=column+1){
legal=1;
if(flip==0)
return legal;
for(j=i-1;j>column;--j){
// gameboard[row][j]=color;
board[color]|=shift(row,j);
board[opponent_color]&=~shift(row,j);
}
}
break;
}
/*check left*/
for(i=column-1;i>0;--i)
if((board[opponent_color]&shift(row,i))==0){
if((board[color]&shift(row,i))!=0 && i!=column-1){
legal=1;
if(flip==0)
return legal;
for(j=i+1;j<column;++j){
// gameboard[row][j]=color;
board[color]|=shift(row,j);
board[opponent_color]&=~shift(row,j);
}
}
break;
}
/*check upper right*/
for(i=1;(row-i)>0 && (column+i)<=8;++i)
if((board[opponent_color]&shift((row-i),(column+i)))==0){
if((board[color]&shift((row-i),(column+i)))!=0 && i!=1){
legal=1;
if(flip==0)
return legal;
for(j=i-1;j>0;--j){
// gameboard[(row-j)][(column+j)]=color;
board[color]|=shift((row-j),(column+j));
board[opponent_color]&=~shift((row-j),(column+j));
}
}
break;
}
/*check bottom left*/
for(i=1;(row+i)<=8 && (column-i)>0;++i)
if((board[opponent_color]&shift((row+i),(column-i)))==0){
if((board[color]&shift((row+i),(column-i)))!=0 && i!=1){
legal=1;
if(flip==0)
return legal;
for(j=i-1;j>0;--j){
// gameboard[(row+j)][(column-j)]=color;
board[color]|=shift((row+j),(column-j));
board[opponent_color]&=~shift((row+j),(column-j));
}
}
break;
}
/*check upper left*/
for(i=1;(row-i)>0 && (column-i)>0;++i)
if((board[opponent_color]&shift((row-i),(column-i)))==0){
if((board[color]&shift((row-i),(column-i)))!=0 && i!=1){
legal=1;
if(flip==0)
return legal;
for(j=i-1;j>0;--j){
// gameboard[(row-j)][(column-j)]=color;
board[color]|=shift((row-j),(column-j));
board[opponent_color]&=~shift((row-j),(column-j));
}
}
break;
}
/*chech bottom right*/
for(i=1;(row+i)<=8 && (column+i)<=8;++i)
if((board[opponent_color]&shift((row+i),(column+i)))==0){
if((board[color]&shift((row+i),(column+i)))!=0 && i!=1){
legal=1;
if(flip==0)
return legal;
for(j=i-1;j>0;--j){
// gameboard[(row+j)][(column+j)]=color;
board[color]|=shift((row+j),(column+j));
board[opponent_color]&=~shift((row+j),(column+j));
}
}
break;
}
if(legal){
// gameboard[row][column]=color;
board[color]|=shift(row,column);
*my_board=board[color];
*opponent_board=board[opponent_color];
}
return legal;
}