这是一个德国人写的用于计算各种函数的表达式计算工具，可以计算各种数学函数sin cos tg ctg并处理括号，四则运算，还可以使用变量如A，B，C等，是VC中一款不可多得的表达式计算类和计算工具。-It is written by a German expression used to calculate the various functions calculation tool, we can calculate various mathematical functions sin cos tg ctg and address in parentheses, arithmetic, you can also use variables such as A, B, C, etc., is the VC a rare expression in the calculation of class and computational tools.