求指点 const 使用问题
程序代码：#include<stdio.h>
#include<stdlib.h>
#include<stdbool.h>
#include<ctype.h>
#include<string.h>
const int SIZE=6;
const char comp_c='@';
//char const player_c='O';
const char player_c='O';//程序报错起始位置
void display(char board[][SIZE]);
int valid_moves(char board[][SIZE],bool moves[][SIZE],char player);
void make_move(char board[][SIZE],int row,int col,char player);
void computer_move(char board[][SIZE],bool moves[][SIZE],char player);
int best_move(char board[][SIZE],bool moves[][SIZE],char player);
int get_score(char board[][SIZE],char player);
int main(void)
{
char board[SIZE][SIZE]={0};
bool moves[SIZE][SIZE]={false};
int row=0;
int col=0;
int no_of_games=0;
int no_of_moves=0;
int invalid_moves=0;
int comp_score=0;
int user_score=0;
char y=0;
int x=0;
char again=0;
bool next_player=true;
do
{
next_player=!next_player;
no_of_moves=4;
for(row=0;row<SIZE;row++)
for(col=0;col<SIZE;col++)
board[row][col]=' ';
board[SIZE/2-1][SIZE/2-1]=board[SIZE/2][SIZE/2]='O';
board[SIZE/2-1][SIZE/2]=board[SIZE/2][SIZE/2-1]='@';
/*int mid=SIZE/2;
board[mid-1][mid-1]=board[mid][mid]=player_c;
board[mid-1][mid]=board[mid][mid-1]=comp_c;*/
do
{
display(board);
if(next_player=!next_player)
{
if(valid_moves(board,moves,player_c))
{
for( ; ; )
{
printf("Please enter your move (row column):");
scanf("%d%c",&x,&y);
y=tolower(y)-'a';
x--;
if(x>=0&&y>=0&&x<SIZE&&y<SIZE&&moves[x][y])
{
make_move=(board,x,y,player_c);//程序报错，const char无法转换成void
no_of_moves++;
break;
}
else
printf("Not a valid move,try again.\n");
}
}
else
if(++invalid_moves<2)
{
printf("\nYou have to pass,press return");
scanf("%c",&again);
}
else
printf("\nNeither of us can go ,so the game is over.\n");
}
else
{
if(valid_moves(board,moves,'@'))
{
invalid_moves=0;
computer_move(board,moves,'@');
no_of_moves++;
}
else
{
if(++invalid_moves<2)
printf("\nI have to pass,your go\n");
else
printf("\nNeither of us can go,so the game is over.\n");
}
}
}while(no_of_moves<SIZE*SIZE&&invalid_moves<2);
display(board);
comp_score=user_score=0;
for(row=0;row<SIZE;row++)
for(col=0;col<SIZE;col++)
{
comp_score +=board[row][col]==comp_c;
user_score +=board[row][col]==player_c;
}
printf("The final score is:\n");
printf("Computer %d\n User %d\n\n",comp_score,user_score);
printf("Do you want to play again (y/n):");
scanf("%c",&again);
}while(tolower(again)=='y');
printf("\nGoodbye\n");
//system("pause");
return 0;
}
void display(char board[][SIZE])
{
int row=0;
int col=0;
char col_label='a';
printf("\n");
for(col=0;col<SIZE;col++)
printf(" %c",col_label+col);
printf("\n");
for(row=0;row<SIZE;row++)
{
printf(" +");
for(col=0;col<SIZE;col++)
printf("---+");
printf("\n%2d|",row+1);
for(col=0;col<SIZE;col++)
printf(" %c |",board[row][col]);
printf("\n");
}
printf(" +");
for(col=0;col<SIZE;col++)
printf("---+");
printf("\n");
}
int valid_moves(char board[][SIZE],bool moves[][SIZE],char player)
{
int rowdelta=0;
int coldelta=0;
int x=0;
int y=0;
int no_of_moves=0;
int row=0;
int col=0;
char opponent=(player==player_c)?comp_c:player_c;
for(row=0;row<SIZE;row++)
for(col=0;col<SIZE;col++)
moves[row][col]=false;
for(row=0;row<SIZE;row++)
for(col=0;col<SIZE;col++)
{
if(board[row][col] !=' ')
continue;
for(rowdelta=-1;rowdelta<=1;rowdelta++)
for(coldelta=-1;coldelta<=1;coldelta++)
{
if(row+rowdelta<0||row+rowdelta>=SIZE||col+coldelta<0||col+coldelta>=SIZE||(rowdelta==0&&coldelta==0))
continue;
if(board[row+rowdelta][col+coldelta]==opponent)
{
x=row+rowdelta;
y=col+coldelta;
for(;;)
{
x +=rowdelta;
y +=coldelta;
if(x<0||x>=SIZE||y<0||y>=SIZE)
break;
if(board[x][y]==' ')
break;
if(board[x][y]==player)
{
moves[row][col]=true;
no_of_moves++;
break;
}
}
}
}
}
return no_of_moves;
}
void make_move(char board[][SIZE],int row,int col,char player)
{
int rowdelta=0;
int coldelta=0;
int x=0;
int y=0;
char opponent=(player==player_c)?comp_c:player_c;
board[row][col]=player;
for(rowdelta=-1;rowdelta<=1;rowdelta++)
for(coldelta=-1;coldelta<=1;coldelta++)
{
if(row+rowdelta<0||row+rowdelta>=SIZE||col+coldelta<0||col+coldelta>=SIZE||(rowdelta==0&&coldelta==0))
continue;
if(board[row+rowdelta][col+coldelta]==opponent)
{
x=row+rowdelta;
y=col+coldelta;
for(;;)
{
x +=rowdelta;
y +=coldelta;
if(x<0||x>=SIZE||y<0||y>=SIZE)
break;
if(board[x][y]==' ')
break;
if(board[x][y]==player)
{
while(board[x-=rowdelta][y-=coldelta]==opponent)
board[x][y]=player;
break;
}
}
}
}
}
void computer_move(char board[][SIZE],bool moves[][SIZE],char player)
{
int best_row=0;
int best_col=0;
int new_score=0;
int score=100;
int row=0;
int col=0;
char temp_board[SIZE][SIZE];
bool temp_moves[SIZE][SIZE];
char opponent=(player==player_c)?comp_c:player_c;
for(row=0;row<SIZE;row++)
for(col=0;col<SIZE;col++)
{
if( !moves[row][col])
continue;
memcpy(temp_board,board,sizeof(temp_board));
make_move(temp_board,row,col,player);
valid_moves(temp_board,temp_moves,opponent);
new_score=best_move(temp_board,temp_moves,opponent);
if(new_score<score)
{
score=new_score;
best_row=row;
best_col=col;
}
}
make_move(board,best_row,best_col,player);
}
int get_score(char board[][SIZE],char player)
{
int score=0;
int row=0;
int col=0;
char opponent=(player==player_c)?comp_c:player_c;
for(row=0;row<SIZE;row++)
for(col=0;col<SIZE;col++)
{
score -=board[row][col]==opponent;
score +=board[row][col]==player;
}
return score;
}
int best_move(char board[][SIZE],bool moves[][SIZE],char player)
{
char opponent=(player==player_c)?comp_c:player_c;
char new_board[SIZE][SIZE]={0};
int score=0;
int new_score=0;
int row=0;
int col=0;
for(row=0;row<SIZE;row++)
for(col=0;col<SIZE;col++)
{
if(!moves[row][col])
continue;
memcpy(new_board,board,sizeof(new_board));
make_move(new_board,row,col,player);
new_score=get_score(new_board,player);
if(score<new_score)
score=new_score;
}
return score;
}
像我这个应该怎样去改，const有什么注意使用的规定呢？
