rmdev.Calculator

Library to evaluate mathematical expressions respecting the priority of operators with support for variables, and custom functions.

The library is case sensitive for both function and variable names.

Numbers

The decimal separator must be the point, regardless of which language is being used, the thousand separator must not be used.

Consts

PI = 3.14159265358979
E = 2.71828182845904

Variables

Variables can be declared using letters, numbers, $, and underscore, but they cannot start with numbers or contain accents.

Operators

+ Addition
- Subtraction
* Multiplication
/ Division
% Rest of Division
^ Power
( e ) Prioritization

First it will calculate what is in parentheses,

followed by power,

then multiplications, divisions, and remainders

and finally additions and subtractions.

In case operations are at the same priority level, they will be executed from left to right.

Functions

Root(radicand, index) Nth root of a number
Sqrt(radicand) Square root of a number
Abs(V) Absolute value of V
Avg(V1, V2, ..., Vn ) Average of values
Sum(V1, V2, ..., Vn ) Sum of values
Round(V) Rounds a number
Round(V, n) Rounds a number to n decimal places
Truncate(V) Truncates a number
Ceiling(V) Rounds a number up
Floor(V) Rounds a number down
Sin(V) Sin of V (in degrees)
Cos(V) Cosine of V (in degrees)
Tan(V) Tangent of V (in degrees)
Max(V1, V2, ..., Vn ) Greater between the informed values
Min(V1, V2, ..., Vn ) Lowest between the values entered

Parameters must be separated by a comma.

Internationalized Functions

Error messages will be displayed according to the current thread's culture, but to use functions with their translated names, you must inform the culture when creating a new Calc object.

Português (pt)

Root -> Raiz
Sqrt -> RaizQuadrada
Abs -> Abs
Avg -> Media
Sum -> Soma
Round -> Arredondar
Truncate -> Truncar
Ceiling -> ArredondarParaCima
Floor -> ArredondarParaBaixo
Sin -> Seno
Cos -> Coseno
Tan -> Tangente
Max -> Max
Min -> Min

To add support for new languages just add the corresponding resources in the Resources folder.

Custom Functions

Functions can be declared using letters, numbers, $, and underscore, but cannot start with numbers or contain accents.

Functions must follow the delegate

delegate decimal CustomFunction(decimal[] parameters)

The parameter array will never be null, but it can be empty.

function example:

decimal SumAll(decimal[] parameters){
    return parameters.Sum();
}

Custom functions can override native functions, but custom functions are not semantically checked during checks done by the Calc.Check() method. Exceptions thrown inside a custom function will only be thrown when the Solve method tries to solve an expression with that function.

Comments and ignored characters

White spaces, tabs and line breaks will be ignored, which allows you to write expressions with more than one line.

You can also create single line comments using // or block comments using /* and */ to delimit the start and end of the block.

Examples

ICalc calc = new Calc();
var result = calc.Solve("1 + 2"); // result = 3

ICalc calc = new Calc();
calc.SetVariable("a", 10);
var result = calc.Solve("a + 2"); // result = 12

ICalc calc = new Calc();
var result = calc.Solve("Sum(1, 2, 3)"); // result = 6

ICalc calc = new Calc();
calc.CustomFunctions["SumAll"] = args => args.Sum();
var result = calc.Solve("SumAll(1, 2, 3)"); // result = 6

GRMagic/RMdev.Calculator