MathParser.org-mXparser 数学表达式计算

背景

在系统中需要计算公式，参数可以配置，类似excel的情况，可以实现数据的计算。

mXparser

实例

 public static void main(String[] args) throws InterruptedException {         Argument days = new Argument("days = 30");         Expression min = new Expression("min(days/10,1)", days);         mXparser.consolePrint(min.getExpressionString() + "----" + min.calculate());         Expression e = new Expression("2-(32-4)/(23+4/5)-(2-4)*(4+6-98.2)+4");         mXparser.consolePrintln("Res: " + e.getExpressionString() + " = " + e.calculate());         Expression abs = new Expression("abs(-1)");         mXparser.consolePrintln("Res: " + abs.getExpressionString() + " = " + abs.calculate());         Expression sqrt = new Expression("sqrt(2)");         mXparser.consolePrintln("Res: " + sqrt.getExpressionString() + " = " + sqrt.calculate());         Function A = new Function("t(a,b) = 1/2 * a *b");         Expression expression = new Expression("t(2,4)",A);         mXparser.consolePrintln(expression.getExpressionString() +"-----------"+expression.calculate());         Argument a = new Argument("a = 3");         Argument b = new Argument("b = 3");         Argument h = new Argument("h = 4");         Expression expression1 = new Expression("t(b,h)",A,b,h,a);         mXparser.consolePrintln(expression1.getExpressionString() +"-----------"+expression1.calculate());         Expression expression2 = new Expression("1/2 * a *b",A,b,h,a);         mXparser.consolePrintln(expression2.getExpressionString() +"-----------"+expression2.calculate());      } 

源码

https://github.com/mariuszgromada/MathParser.org-mXparser

来源：博客园

作者：安生蓝草

链接：https://www.cnblogs.com/ansheng-info/p/11589936.html