Expression nodes support simple expressions involving arithmetic and Boolean (true or false logic) operators.
表达式节点支持包含算术和布尔(真或假逻辑)运算符的简单表达式。
As an example we will write a small program to read and evaluate arithmetic expressions consisting of floating point Numbers, parentheses and the usual operators for addition, subtraction, and so on.
作为例子，我们将要写一个计算由浮点数、圆括号及一些常用的加、减等算术符号组成的算术表达式的程序。
As an example we will write a small program to read and evaluate arithmetic expressions consisting of floating point Numbers, parentheses and the usual operators for addition, subtraction, and so on.
例如我们要写一个计算由浮点数、圆括号及一些常用的加、减等算术符号组成的算术表达式的程序。
Create expressions with number and date data by using arithmetic operators.
用算数运算符操作数字与时间数据来创建语句。
Create expressions with number and date data by using arithmetic operators.
用算数运算符操作数字与时间数据来创建语句。
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