怀念学校的生活

今天闲着没事，想起了学校时学C语言时候印象最深的两个程序：打印99乘法表和求9宫图的解。99乘法表那个，让我知道了原来for还可以两层嵌套用；而9宫图的那个，当时写的是一个4x4的（其实是16宫），在学校的破机器上运行了2分钟多，得到了几千个解；记得张大傻(嘿嘿，别打我)当时还不相信有这么多的结果。丫的，好久没这厮的消息了。
怀念在学校里的生活！怀念玩红警魔兽、踢足球的日子！

//99乘法表
public class Table9mult9 {
    public static void main(String[] args) {
        for(int i =1 ;i<10 ;i++){
            for(int j= 1; j<10 ;j++){
                if(j<=i)
                    System.out.print(j +"*" + i +"=" + (i*j) +"   " ) ;
                if(i==j)
                    System.out.print("/n") ;
            }
        }
    }
}

//九宫图求解
public class Grid9{
 private int average ; //将1－9 填到9个格子里，每个格子的平均数
 private int avg3Times ;
 private int[] grid = new int[9]; //9个格子
 private String stars ;
 private int resultsNum ;
 
 
 private static int getAverage(){
     int sum = 0 ;
  for(int i = 1;i<=9 ;i++){
   sum += i;
  }
  return sum /9 ;
 }
 
 public Grid9(){
     resultsNum = 0 ;
     average = getAverage() ;
     avg3Times = average * 3 ;
     stars = "--------------------" ;
     for(int i=0;i<9;i++){
         grid[i] = 0 ;
     }
 }
 //构造gird
 public void generateGrid(int i,int j,int k ,
         int ii,int jj,int kk,int iii,int jjj,int kkk){
     if (i!=j && i!=k && i!= ii && i!=jj && i!=kk && i!=iii && i!= jjj && i!=kkk
             && j != k && j!=ii && j!= jj && j!= kk && j!=iii && j!=jjj && j!= kkk
             && k !=ii && k!=jj && k!= kk && k!=iii && k!=jjj && k!=kkk
             && ii!=jj && ii!=kk && ii!= iii && ii!=jjj && ii!= kkk
             && jj!=kk && jj!=iii && jj!=jjj && jj!= kkk
             && kk!=iii && kk!= jjj && kk!= kkk
             && iii!=jjj && iii!= kkk
             && jjj!=kkk
             ){
      grid[0] = i ;
      grid[1] = j ;
      grid[2] = k ;
      grid[3] = ii ;
      grid[4] = jj ;
      grid[5] = kk ;
      grid[6] = iii ;
      grid[7] = jjj ;
      grid[8] = kkk ;
     }else{
         for (int index = 0; index < 9; index++) {
   grid[index] = 0 ;
  }
     }
 }
 //打印 grid
 public void printGrid(){
     for (int i = 1; i <= 9; i++) {
            System.out.print(grid[i-1] + "  ") ;
            if (i%3==0){
                System.out.print("/n") ;
            }
        }
     System.out.println(stars) ;
 }
 
 //得到第一行的和，以下依次
 public int get1Row(){
     return grid[0] +grid[1]+grid[2] ;
 }
 public int get2Row(){
     return grid[3] +grid[4]+grid[5] ;
 }
 public int get3Row(){
     return grid[6] +grid[7]+grid[8] ;
 }
 //得到列的和
 public int get1Col() {
     return grid[0] +grid[3]+grid[6] ;
 }
 public int get2Col() {
     return grid[1] +grid[4]+grid[7] ;
 }
 public int get3Col() {
     return grid[2] +grid[5]+grid[8] ;
 }
 //得到交叉的和
 public int get1X (){
     return grid[0] +grid[4]+grid[8] ;
 }
 public int get2X (){
     return grid[2] +grid[4]+grid[6] ;
 }
 
 //判等：每行＝＝每列＝＝交叉的和
 public boolean isEqual(){
     return (get1Row()==avg3Times && get2Row()==avg3Times && get1Col()== avg3Times
             && get2Col() ==avg3Times &&get1X()==avg3Times && get2X() == avg3Times ) ;
 }
 //得到结果的个数：
 public int getResultsNum(){
     return resultsNum ;
 }
 
 //最笨的办法——遍历
 public void getResults(){
     for (int i = 1; i < 10 ; i++) {
         for (int j = 1; j < 10; j++) {
                for (int k = 1; k < 10; k++) {
                    for (int ii = 1; ii < 10; ii++) {
                        for (int jj = 1; jj < 10; jj++) {
                            for (int kk = 1; kk < 10; kk++) {
                                for (int iii = 1; iii < 10; iii++) {
                                    for (int jjj = 1; jjj < 10; jjj++) {
                                        for (int kkk = 1; kkk < 10; kkk++) {
                                            generateGrid(i, j, k, ii, jj, kk, iii, jjj, kkk) ;
                                            if( isEqual()){
                                                printGrid () ;
                                                resultsNum ++ ;
                                            }
                                        }
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
    
 }
 
 public static void main(String[] args) {
     Grid9 grid9 = new Grid9();
     System.out.println("starting...") ;
     grid9.getResults() ;
     System.out.println("end ") ;
     System.out.println("results number: " + grid9.getResultsNum() ) ;

 }
}