The CoreCLR-NCalc library provides many functions from System.Math which you can use directly in your expression or script.
The framework includes the following built-in functions.
| Name | Description |
|---|---|
| Abs | Returns the absolute value of a specified number. |
| Acos | Returns the angle whose cosine is the specified number. |
| Asin | Returns the angle whose sine is the specified number. |
| Atan | Returns the angle whose tangent is the specified number. |
| Ceiling | Returns the smallest integer greater than or equal to the specified number. |
| Cos | Returns the cosine of the specified angle. |
| Exp | Returns e raised to the specified power. |
| Floor | Returns the largest integer less than or equal to the specified number. |
| IEEERemainder | Returns the remainder resulting from the division of a specified number by another specified number. |
| Log | Returns the logarithm of a specified number. |
| Log10 | Returns the base 10 logarithm of a specified number. |
| Max | Returns the larger of two specified numbers. |
| Min | Returns the smaller of two numbers. |
| Pow | Returns a specified number raised to the specified power. |
| Round | Rounds a value to the nearest integer or specified number of decimal places. The mid number behavior can be changed by using EvaluateOption.RoundAwayFromZero during construction of the Expression object. |
| Sign | Returns a value indicating the sign of a number. |
| Sin | Returns the sine of the specified angle. |
| Sqrt | Returns the square root of a specified number. |
| Tan | Returns the tangent of the specified angle. |
| Truncate | Calculates an integral part of a number. |
| in | Returns whether an element is in a set of values. |
| if | Returns a value based on a condition. |
Let's consider the following simple example, which shows the usage of built-in functions.
public static void Example1()
{
string expression = "Abs(-3.2)";
Expression evaluator = new Expression(expression);
Console.WriteLine("{0} = {1}", expression, evaluator.Evaluate());
expression = "Acos(-0.5)";
evaluator = new Expression(expression);
Console.WriteLine("{0} = {1}", expression, evaluator.Evaluate());
expression = "Floor(4.23)";
evaluator = new Expression(expression);
Console.WriteLine("{0} = {1}", expression, evaluator.Evaluate());
expression = "IEEERemainder(9, 8)";
evaluator = new Expression(expression);
Console.WriteLine("{0} = {1}", expression, evaluator.Evaluate());
expression = "Log10(1000)";
evaluator = new Expression(expression);
Console.WriteLine("{0} = {1}", expression, evaluator.Evaluate());
expression = "in(1 + 1, 1, 2, 3)";
evaluator = new Expression(expression);
Console.WriteLine("{0} = {1}", expression, evaluator.Evaluate());
expression = "if(3 % 2 = 1, 'value is true', 'value is false')";
evaluator = new Expression(expression);
Console.WriteLine("{0} = {1}", expression, evaluator.Evaluate());
}