BOOL flag=YES;
       while(flag)
       {
           int random =arc4random()%100;
           NSLog(@"random = %d",random );
           for(int i = 0;i<100;i++)
           {
               int number = 0;
               NSLog(@"请输入0-100之间任一数字:");
               scanf("%i",&number);
               if(number>random)
               {
                   NSLog(@"您输入的数字太大了!");
               }       
               else if(number<random)
               {
                   NSLog(@"您输入的数字太小了!");
               }
               else
               {
                   NSLog(@"恭喜您,猜对了!");
                   NSLog(@"您总共猜了%i次",++i );
                   NSLog(@"请选择 0:继续  1:退出");
                   int n = 0;
                   scanf("%i",&n);
                   if(n==0)
                   {
                       break;
                   }
                   else if(n==1)
                   {
                       i=101;
                       NSLog(@"游戏结束!" );
                   }
               }
               
               flag = NO ;
           }       
       }