Implied multiplication - 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: Numbers and parenthesis

Java/C# code

// JAVA: import org.mariuszgromada.math.mxparser.*;
// C#: using org.mariuszgromada.math.mxparser;
// ...
Expression e = new Expression("2(3+4)3");
mXparser.consolePrintln(e.getExpressionString() + " = " + e.getCanonicalExpressionString());
mXparser.consolePrintln("Res: " + e.getExpressionString() + " = " + e.calculate());

C++ code

#include "org/mariuszgromada/math/mxparser.hpp"
// ...
ExpressionPtr e = new_Expression("2(3+4)3");
mXparser::consolePrintln(e->getExpressionString() + " = " + e->getCanonicalExpressionString());
mXparser::consolePrintln("Res: " + e->getExpressionString() + " = " + e->calculate());

Code result

[mXparser-v.5.2.1] 2(3+4)3 = 2*(3+4)*3
[mXparser-v.5.2.1] Res: 2(3+4)3 = 42.0

Case 2: Numbers and constants / arguments

Java/C# code

// JAVA: import org.mariuszgromada.math.mxparser.*;
// C#: using org.mariuszgromada.math.mxparser;
// ...
Expression e = new Expression("2pi+3e");
mXparser.consolePrintln(e.getExpressionString() + " = " + e.getCanonicalExpressionString());
mXparser.consolePrintln("Res: " + e.getExpressionString() + " = " + e.calculate());

C++ code

#include "org/mariuszgromada/math/mxparser.hpp"
// ...
ExpressionPtr e = new_Expression("2pi+3e");
mXparser::consolePrintln(e->getExpressionString() + " = " + e->getCanonicalExpressionString());
mXparser::consolePrintln("Res: " + e->getExpressionString() + " = " + e->calculate());

Code result

[mXparser-v.5.2.1] 2pi+3e = 2*pi+3*e
[mXparser-v.5.2.1] Res: 2pi+3e = 14.438030792556722

Case 3: Numbers and constants / arguments and parenthesis

Java/C# code

// JAVA: import org.mariuszgromada.math.mxparser.*;
// C#: using org.mariuszgromada.math.mxparser;
// ...
Expression e = new Expression("2pi(3+4)2e");
mXparser.consolePrintln(e.getExpressionString() + " = " + e.getCanonicalExpressionString());
mXparser.consolePrintln("Res: " + e.getExpressionString() + " = " + e.calculate());

C++ code

#include "org/mariuszgromada/math/mxparser.hpp"
// ...
ExpressionPtr e = new_Expression("2pi(3+4)2e");
mXparser::consolePrintln(e->getExpressionString() + " = " + e->getCanonicalExpressionString());
mXparser::consolePrintln("Res: " + e->getExpressionString() + " = " + e->calculate());

Code result

[mXparser-v.5.2.1] 2pi(3+4)2e = 2*pi*(3+4)*2*e
[mXparser-v.5.2.1] Res: 2pi(3+4)2e = 239.11255823485985

Case 4: Numbers and constants / arguments and parenthesis and functions

Java/C# code

// JAVA: import org.mariuszgromada.math.mxparser.*;
// C#: using org.mariuszgromada.math.mxparser;
// ...
Expression e = new Expression("2pi(3+4)2sin(3)e");
mXparser.consolePrintln(e.getExpressionString() + " = " + e.getCanonicalExpressionString());
mXparser.consolePrintln("Res: " + e.getExpressionString() + " = " + e.calculate());

C++ code

#include "org/mariuszgromada/math/mxparser.hpp"
// ...
ExpressionPtr e = new_Expression("2pi(3+4)2sin(3)e");
mXparser::consolePrintln(e->getExpressionString() + " = " + e->getCanonicalExpressionString());
mXparser::consolePrintln("Res: " + e->getExpressionString() + " = " + e->calculate());

Code result

[mXparser-v.5.2.1] 2pi(3+4)2sin(3)e = 2*pi*(3+4)*2*sin(3)*e
[mXparser-v.5.2.1] Res: 2pi(3+4)2sin(3)e = 33.74356614531889

Case 5: Implied multiplication and possible ambiguity

Java/C# code

// JAVA: import org.mariuszgromada.math.mxparser.*;
// C#: using org.mariuszgromada.math.mxparser;
// ...
Expression e = new Expression("2pi2");
e.checkSyntax();
mXparser.consolePrintln(e.getExpressionString() + " = " + e.getCanonicalExpressionString());
mXparser.consolePrintln(e.getErrorMessage());

C++ code

#include "org/mariuszgromada/math/mxparser.hpp"
// ...
ExpressionPtr e = new_Expression("2pi2");
e->checkSyntax();
mXparser::consolePrintln(e->getExpressionString() + " = " + e->getCanonicalExpressionString());
mXparser::consolePrintln(e->getErrorMessage());

Code result

[mXparser-v.5.2.1] 2pi2 = 2*pi2
[mXparser-v.5.2.1] [2pi2]: Starting syntax check...
[2pi2]: Token 'pi2', index 3: Invalid token.
[2pi2]: Errors have been found.

Case 6: Implied multiplication and list of tokens

Java/C# code

// JAVA: import org.mariuszgromada.math.mxparser.*;
// C#: using org.mariuszgromada.math.mxparser;
// ...
Expression e = new Expression("2pi(3+4)2e");
e.consolePrintCopyOfInitialTokens();

C++ code

#include "org/mariuszgromada/math/mxparser.hpp"
// ...
ExpressionPtr e = new_Expression("2pi(3+4)2e");
e->consolePrintCopyOfInitialTokens();

Code result

[mXparser-v.5.2.1]  --------------------
[mXparser-v.5.2.1] | Expression tokens: |
[mXparser-v.5.2.1]  ---------------------------------------------------------------------------------------------------------------
[mXparser-v.5.2.1] |    TokenIdx |       Token |        KeyW |     TokenId | TokenTypeId |  TokenLevel |  TokenValue |   LooksLike |
[mXparser-v.5.2.1]  ---------------------------------------------------------------------------------------------------------------
[mXparser-v.5.2.1] |           0 |           2 |             |           1 |           0 |           0 |         2.0 |             |
[mXparser-v.5.2.1] |           1 |           * |             |           3 |           1 |           0 |         NaN |             |
[mXparser-v.5.2.1] |           2 |          pi |             |           1 |           9 |           0 |         NaN |             |
[mXparser-v.5.2.1] |           3 |           * |             |           3 |           1 |           0 |         NaN |             |
[mXparser-v.5.2.1] |           4 |           ( |           ( |           1 |          20 |           1 |         NaN |             |
[mXparser-v.5.2.1] |           5 |           3 |       _num_ |           1 |           0 |           1 |         3.0 |             |
[mXparser-v.5.2.1] |           6 |           + |           + |           1 |           1 |           1 |         NaN |             |
[mXparser-v.5.2.1] |           7 |           4 |       _num_ |           1 |           0 |           1 |         4.0 |             |
[mXparser-v.5.2.1] |           8 |           ) |           ) |           2 |          20 |           1 |         NaN |             |
[mXparser-v.5.2.1] |           9 |           * |             |           3 |           1 |           0 |         NaN |             |
[mXparser-v.5.2.1] |          10 |           2 |             |           1 |           0 |           0 |         2.0 |             |
[mXparser-v.5.2.1] |          11 |           * |             |           3 |           1 |           0 |         NaN |             |
[mXparser-v.5.2.1] |          12 |           e |             |           2 |           9 |           0 |         NaN |             |
[mXparser-v.5.2.1]  ---------------------------------------------------------------------------------------------------------------

Case 7: Enable / disable implied multiplication

Java/C# code

// JAVA: import org.mariuszgromada.math.mxparser.*;
// C#: using org.mariuszgromada.math.mxparser;
// ...
Expression e = new Expression("2pi+3e");
e.disableImpliedMultiplicationMode();
e.checkSyntax();
mXparser.consolePrintln("Disable: \n" + e.getErrorMessage());
e.enableImpliedMultiplicationMode();
e.checkSyntax();
mXparser.consolePrintln("Enable: \n" + e.getErrorMessage());

C++ code

#include "org/mariuszgromada/math/mxparser.hpp"
// ...
ExpressionPtr e = new_Expression("2pi+3e");
e->disableImpliedMultiplicationMode();
e->checkSyntax();
mXparser::consolePrintln("Disable: \n" + e->getErrorMessage());
e->enableImpliedMultiplicationMode();
e->checkSyntax();
mXparser::consolePrintln("Enable: \n" + e->getErrorMessage());

Code result

[mXparser-v.5.2.1] Disable: 
[2pi+3e]: Starting syntax check...
[2pi+3e]: Token '2pi', index 1: Invalid token. Possibly missing multiplication operator - try implied multiplication mode.
[2pi+3e]: Token '3e', index 3: Invalid token. Possibly missing multiplication operator - try implied multiplication mode.
[2pi+3e]: Errors have been found.
[mXparser-v.5.2.1] Enable: 
[2pi+3e]: Starting syntax check...
[2pi+3e]: No errors detected.

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

Install-Package MathParser.org-mXparser-Version 6.1.1

Nuget – .NET CLI

dotnet add package MathParser.org-mXparser--version 6.1.1

Nuget – Package Reference

<PackageReference Include="MathParser.org-mXparser"Version="6.1.1"/>

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

<dependency> <groupid>org.mariuszgromada.math</groupid> <artifactid>MathParser.org-mXparser</artifactid> <version>6.1.1</version> </dependency>

Maven – Gradle

implementation 'org.mariuszgromada.math:MathParser.org-mXparser:6.1.1'

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.6.1.1SOURCE_SUBDIR CURRENT/cpp/lib ) FetchContent_MakeAvailable(MathParserOrgMxParser) mxparser_link(YourExecutable)