Solving equation f(x) = 0 | mXparser – Math Expressions Parser for JAVA, C#, C++, Kotlin, Android, .NET/MONO/Xamarin – Mathematical Formula Parser / Evaluator Library

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The tutorial consists of more than 200 live examples from 50 sections given separately for JAVA, C# and C++. Each of the examples can be copied and run on your own environment. In addition, mXparser provides an extensive collection of over 500 built-in math functions, expressions and symbols. Familiarize yourself with the scope and the syntax. Live testing is the best way to learn. Good luck! 🙂

Tutorial Math Collection API spec Download

Below is the code for JAVA, C# (the code for C# is almost identical) and C++. To copy the code, double-click inside the frame.

Case 1: Solve 2x-4 = 0 for x in [0, 10]

Java/C# code

// JAVA: import org.mariuszgromada.math.mxparser.*;
// C#: using org.mariuszgromada.math.mxparser;
// ...
Expression e = new Expression("solve( 2*x - 4, x, 0, 10 )");
mXparser.consolePrintln("Res: " + e.getExpressionString() + " = " + e.calculate() );

C++ code

#include "org/mariuszgromada/math/mxparser.hpp"
// ...
ExpressionPtr e = new_Expression("solve( 2*x - 4, x, 0, 10 )");
mXparser::consolePrintln("Res: " + e->getExpressionString() + " = " + e->calculate() );

Code result

[mXparser-v.5.2.1] Res: solve( 2*x - 4, x, 0, 10 ) = 2.0

Case 2: Solve cos(x) = 0 for x in [0, pi]

Java/C# code

// JAVA: import org.mariuszgromada.math.mxparser.*;
// C#: using org.mariuszgromada.math.mxparser;
// ...
Expression e = new Expression("solve( cos(x), x, 0, pi )");
mXparser.consolePrintln("Res: " + e.getExpressionString() + " = " + e.calculate() );

C++ code

#include "org/mariuszgromada/math/mxparser.hpp"
// ...
ExpressionPtr e = new_Expression("solve( cos(x), x, 0, pi )");
mXparser::consolePrintln("Res: " + e->getExpressionString() + " = " + e->calculate() );

Code result

[mXparser-v.5.2.1] Res: solve( cos(x), x, 0, pi ) = 1.57079633

Case 3: Solve cos(x) = 0 for x in [pi, pi] (root not bracketed)

Java/C# code

// JAVA: import org.mariuszgromada.math.mxparser.*;
// C#: using org.mariuszgromada.math.mxparser;
// ...
Expression e = new Expression("solve( cos(x), x, -pi, pi )");
mXparser.consolePrintln("Res: " + e.getExpressionString() + " = " + e.calculate() );

C++ code

#include "org/mariuszgromada/math/mxparser.hpp"
// ...
ExpressionPtr e = new_Expression("solve( cos(x), x, -pi, pi )");
mXparser::consolePrintln("Res: " + e->getExpressionString() + " = " + e->calculate() );

Code result

[mXparser-v.5.2.1] Res: solve( cos(x), x, -pi, pi ) = -1.57079633

Case 4: Solve x-y = 0 for x in [0, 10] and y = 4

Java/C# code

// JAVA: import org.mariuszgromada.math.mxparser.*;
// C#: using org.mariuszgromada.math.mxparser;
// ...
Argument y = new Argument("y = 4");
Expression e = new Expression("solve( x-y, x, 0, 10 )", y);
mXparser.consolePrintln("Res: " + e.getExpressionString() + " = " + e.calculate() );

C++ code

#include "org/mariuszgromada/math/mxparser.hpp"
// ...
ArgumentPtr y = new_Argument("y = 4");
ExpressionPtr e = new_Expression("solve( x-y, x, 0, 10 )", y);
mXparser::consolePrintln("Res: " + e->getExpressionString() + " = " + e->calculate() );

Code result

[mXparser-v.5.2.1] Res: solve( x-y, x, 0, 10 ) = 4.0

Case 5: Solve sin'(x) = 0 for x in [0, pi]

Java/C# code

// JAVA: import org.mariuszgromada.math.mxparser.*;
// C#: using org.mariuszgromada.math.mxparser;
// ...
Argument x = new Argument("x");
Expression e = new Expression("solve( der( sin(x), x ), x, 0, pi )", x);
mXparser.consolePrintln("Res: " + e.getExpressionString() + " = " + e.calculate() );

C++ code

#include "org/mariuszgromada/math/mxparser.hpp"
// ...
ArgumentPtr x = new_Argument("x");
ExpressionPtr e = new_Expression("solve( der( sin(x), x ), x, 0, pi )", x);
mXparser::consolePrintln("Res: " + e->getExpressionString() + " = " + e->calculate() );

Code result

[mXparser-v.5.2.1] Res: solve( der( sin(x), x ), x, 0, pi ) = 1.57079633

Nuget – Package Manager (C#, F#, Visual Basic, …)

Install-Package MathParser.org-mXparser -Version 6.1.0

Nuget – .NET CLI

dotnet add package MathParser.org-mXparser --version 6.1.0

Nuget – Package Reference

<PackageReference Include="MathParser.org-mXparser" Version="6.1.0"/>

Maven – Dependency (Java, Kotlin, Scala, Groovy, …)

<dependency> <groupid>org.mariuszgromada.math</groupid> <artifactid>MathParser.org-mXparser</artifactid> <version>6.1.0</version> </dependency>

Maven – Gradle

implementation 'org.mariuszgromada.math:MathParser.org-mXparser:6.1.0'

CMake – Dependency / FetchContent (C++, MSVC, LLVM/Clang, GNU/GCC, MinGW, MSYS2, WSL, Windows, Linux, Unix, MacOS)

include(FetchContent) FetchContent_Declare(MathParserOrgMxParserGIT_REPOSITORYhttps://github.com/mariuszgromada/MathParser.org-mXparser.gitGIT_TAGv.6.1.0SOURCE_SUBDIR CURRENT/cpp/lib ) FetchContent_MakeAvailable(MathParserOrgMxParser) target_link_libraries(YourExecutableMathParserOrgMxParser)