乌鸦喝水的练习。计算乌鸦要丢多少石头才能喝到水呢？如果假设乌鸦喝到的是毒药会怎样？如果石头是炸药怎样？适合java面向对象的初学者-Crow drinking practice. Calculate the number of crows to throw stones in order to drink water? If the assumption is that crow drink poison what would happen? If the stone is what dynam

使用java 编写的简单的计算表达式的程序，供大家学习交流-Using java prepared a simple procedure for the calculation of expression for them to learn from the exchange of

在java环境下，可以利用栈计算后缀表达式的值程序已测试成功-Postfix expression can calculate the value of the stack