2.3

  一个简单的猜数游戏程序：  利用Math.random()方法生成0-1之间的double型数dNum，将dNum转换为0-100之间的整数iNum。  利用KeyInput.readInt()方法接收键盘输入的整数inNum。如果inNum小于iNum，在屏幕上显示“输入的值小，请输入更大的数.”；如果inNum大于iNum，在屏幕上显示“输入的值大，请输入更小的数.”；如果inNum等于iNum，在屏幕上显示“猜对了.”，并结束运行。  猜测错误的时候，重新输入inNum，直到猜对为止。如果猜测10次后仍未猜对，显示“猜测次数已达10次，猜数失败.”，并结束程序的运行。 (A simple guessing game program:  use Math.random () method to generate double-type numbers between 0-1 dNum, will dNum into an integer between 0-100 iNum.  use KeyInput.readInt () method receives the keyboard input integer inNum. If inNum less than iNum, the screen " Enter the value of the small, enter the greater number." If inNum than iNum, the screen " Enter the value of the large number of smaller type." If inNum equal iNum, displayed on the screen, " guessed." and end the run.  guess wrong, re-enter inNum, until you guess it right up. If the guess was right 10 times not to show " guess the number has reached 10 times, guess the number of failures." And end the program.)