void PutQueen(int n)  
{  
    int col,i,j;  
    for(col=0;col<8;col++)  
    {  
        if(a[col]&& b[n+col] && c[n-col+7])                 //判断安全位置   
        {  
            chess[n][col]=1;                            //放置皇后   
            a[col]=0;  
            b[n+col]=0;  
            c[n-col+7]=0;  
            if(n==7)  
            {  
                sum++;  
                printf("第%d种可能的摆法:\n",sum);    //输出皇后摆法   
                    for(i=0;i<8;i++){  
                        printf("\t\t");  
                        for(j=0;j<8;j++)  
                            printf("%d ",chess[i][j]);  
                        printf("\n");  
                    }  
                    printf("\n");  
//                  goto END;                         //输出第一种摆法   
                    if(sum%10==0)                     //每输出十种暂停   
                    {  
                        printf("按回车键继续……");  
                        getchar();  
                    }  
            }  
            else   
                PutQueen(n+1);                        //递归   
            chess[n][col]=0;                            //取消皇后   
            b[n+col]=1;                                    
            c[n-col+7]=1;  
            a[col]=1;                             
        }  
    }  
//END:  return;   
}