一个一元曲线多项式数值演示例子，用于各种数据统计分析。-a one yuan polynomial curve Numerical examples demonstrate, for the statistical analysis of data.

这是我在大学波尔多1类PROJET。我professieur Mr.Baudon创世这些代码给Java结构hashtree的例子。这是评估一个数值表达式，实现了类计算器。-This is to achieve a class calculator evaluating a numeric expression. Prefixed expressions are used to facilitate analysis: no priority no assoc