# Using built-in functions

## Case 1: Unary function

$$\sin(2)-\cos(3)$$

// JAVA: import org.mariuszgromada.math.mxparser.*;
// ...
Expression e = new Expression("sin(2)-cos(3)");
mXparser.consolePrintln("Res: " + e.getExpressionString() + " = " + e.calculate());

[mXparser-v.5.2.1] Res: sin(2)-cos(3) = 1.8992899234261271


## Case 2: Binary function #1

$$\min(3,4) + \max(-2,-1)$$

// JAVA: import org.mariuszgromada.math.mxparser.*;
// ...
Expression e = new Expression("min(3,4) + max(-2,-1)");
mXparser.consolePrintln("Res: " + e.getExpressionString() + " = " + e.calculate());

[mXparser-v.5.2.1] Res: min(3,4) + max(-2,-1) = 2.0


## Case 3: Binary function #2

$$10\choose 5$$

// JAVA: import org.mariuszgromada.math.mxparser.*;
// ...
Expression e = new Expression("C(10,5)");
mXparser.consolePrintln("Res: " + e.getExpressionString() + " = " + e.calculate());

[mXparser-v.5.2.1] Res: C(10,5) = 252.0


## Case 4: Function with 3 arguments #1 – condition checking

$$\text{if}(a, b, c)=\begin{cases}\quad b&\text{if}\quad a\text{is true}\\\quad c&\text{otherwise}\end{cases}$$

// JAVA: import org.mariuszgromada.math.mxparser.*;
// ...
Expression e = new Expression("if(2<3, 1, 0)");
mXparser.consolePrintln("Res: " + e.getExpressionString() + " = " + e.calculate());

[mXparser-v.5.2.1] Res: if(2<3, 1, 0) = 1.0


## Case 5: Function with 3 arguments #2

// JAVA: import org.mariuszgromada.math.mxparser.*;
// ...
Expression e = new Expression("if(3<2, 1, if(1=1, 5, 0) )");
mXparser.consolePrintln("Res: " + e.getExpressionString() + " = " + e.calculate());

[mXparser-v.5.2.1] Res: if(3<2, 1, if(1=1, 5, 0) ) = 5.0


## Case 6: Function with n-arguments

$$f(x_1,x_2.\ldots,x_n)$$

// JAVA: import org.mariuszgromada.math.mxparser.*;
// ...
Expression e = new Expression("gcd(4,2,8,20)");
mXparser.consolePrintln("Res: " + e.getExpressionString() + " = " + e.calculate());

[mXparser-v.5.2.1] Res: gcd(4,2,8,20) = 2.0


## Case 7: Function with even number of arguments

$$\text{iff}(a_1, b_1;a_2, b_2;\ldots,a_n, b_n)=\begin{cases}b_1&\text{if}\quad a_1\text{is true}\\b_2&\text{if}\quad a_2\text{is true}\\\ldots&\ldots\\b_n&\text{if}\quad a_n\text{is true}\end{cases}$$

// JAVA: import org.mariuszgromada.math.mxparser.*;
// ...
Expression e = new Expression("iff( 1>2, 1, 3<2, 2, 5>3, 3, 7 < 3, 4 )");
mXparser.consolePrintln("Res: " + e.getExpressionString() + " = " + e.calculate());

[mXparser-v.5.2.1] Res: iff( 1>2, 1, 3<2, 2, 5>3, 3, 7 < 3, 4 ) = 3.0


## Case 8: Equivalent to case 7 – more convenient form of marking parameters

// JAVA: import org.mariuszgromada.math.mxparser.*;
// ...
Expression e = new Expression("iff( 1>2, 1; 3<2, 2; 5>3, 3; 7 < 3, 4 )");
mXparser.consolePrintln("Res: " + e.getExpressionString() + " = " + e.calculate());

[mXparser-v.5.2.1] Res: iff( 1>2, 1; 3<2, 2; 5>3, 3; 7 < 3, 4 ) = 3.0

###### Nuget – Package Manager

Install-Package MathParser.org-mXparser -Version 5.2.1

Nuget – .NET CLI

dotnet add package MathParser.org-mXparser --version 5.2.1

Nuget – Package Reference

<PackageReference Include="MathParser.org-mXparser" Version="5.2.1"/>

###### Maven – Dependency

<dependency><groupid>org.mariuszgromada.math</groupid><artifactid>MathParser.org-mXparser</artifactid><version>5.2.1</version></dependency>

implementation 'org.mariuszgromada.math:MathParser.org-mXparser:5.2.1'

implementation("org.mariuszgromada.math:MathParser.org-mXparser:5.2.1")
git clone https://github.com/mariuszgromada/MathParser.org-mXparser