Matheval is a mathematical expressions evaluator library written in C#. Allows to evaluate mathematical, boolean, string and datetime expressions
Code is written in pure C#, run on the fly. We don't use any third party libraries or packages
If you get any bugs please let me know by creating a new issue.
Many thanks to our contributors:
Thanhrin (from Da Nang, VietNam)
Eduardo Salinas (from Huesca, Spain)
Using Package Manager
PM> Install-Package org.matheval -Version 1.0.0.2https://matheval.org/math-expression-eval-for-c-sharp/
https://matheval.org/math-expression-eval-for-c-sharp/#op-constants-funcs
using System;
using org.matheval;
public class Program
{
public static void Main()
{
Expression expression = new Expression("(a + b) / 2 ");
expression.Bind("a", 3);
expression.Bind("b",5);
Object value = expression.Eval();
Console.WriteLine("Result: "+value); //Result: 4
}
}using System;
using org.matheval;
public class Program
{
public static void Main()
{
Expression expression = new Expression("IF(time>8, (HOUR_SALARY*8) + (HOUR_SALARY*1.25*(time-8)), HOUR_SALARY*time)");
//bind variable
expression.Bind("HOUR_SALARY", 10);
expression.Bind("time", 9);
//eval
Decimal salary = expression.Eval<Decimal>();
Console.WriteLine(salary); //return 92.5
}
}Expression expression = new Expression("SUM(1,2,3) + true");
List<String> errors = expression.GetError();
if(errors.Count > 0)
{
foreach(String error in errors)
{
Console.WriteLine(error);
}
} using System;
using org.matheval;
public class Program
{
public static void Main()
{
Expression expr = new Expression("MIN(2,3,16)");
int min = expr.Eval<int>();
Console.WriteLine(min);// return 2 (min)
expr.SetFomular("Max(2,3,16)");
int max = expr.Eval<int>();
Console.WriteLine(max);// return 16 (max)
expr.SetFomular("Sum(2,3,16)");
decimal sum = expr.Eval<decimal>();
Console.WriteLine(sum);// return 21 (sum)
expr.SetFomular("average(2,3,16)");
decimal average = expr.Eval<decimal>();
Console.WriteLine(average);// return 7 (average)
}
}using System;
using org.matheval;
public class Program
{
public static void Main()
{
Expression expr = new Expression("ROUND(2.149, 1)");
Object value = expr.Eval<Decimal>();
Console.WriteLine("ROUND(2.149, 1) = "+value); //return 2.1
expr = new Expression("FLOOR(2.149)");
value = expr.Eval();
Console.WriteLine("FLOOR(2.149) = "+value); //return 2
expr = new Expression("FLOOR(3.7,2)");
value = expr.Eval();
Console.WriteLine("FLOOR(3.7,2) = "+value); //return 2
expr = new Expression("CEILING(2.149)");
value = expr.Eval();
Console.WriteLine("CEILING(2.149) = "+value); //return 3
expr = new Expression("CEILING(1.5, 0.1)");
value = expr.Eval();
Console.WriteLine("CEILING(1.5, 0.1) = "+value); //return 1.5
}
}using System;
using org.matheval;
public class Program
{
public static void Main()
{
Expression expr = new Expression("tan(a)^3-((3*sin(a)-sin(3*a))/(3*cos(a)+cos(3*a)))");
Decimal value = expr.Bind("a", Math.PI/6).Eval<Decimal>();
Console.WriteLine(value); //return 0
}
}using System;
using org.matheval;
public class Program
{
public static void Main()
{
Expression taxExpr = new Expression("IF(LOWER(TAX_CODE)='vat',amount*10/100,IF(LOWER(TAX_CODE)='gst',amount*15/100,0))");
taxExpr.Bind("TAX_CODE","GST");
taxExpr.Bind("amount", 5005m);
Decimal value = taxExpr.Eval<Decimal>();
Console.WriteLine(value);
}
}using System;
using org.matheval;
public class Program
{
public static void Main()
{
Expression expr = new Expression("CONCAT('The United States of ', 'America')");
String value = expr.Eval<String>();
Console.WriteLine(value);//The United States of America
}
}MIT license