# Implied multiplication

## Case 1: Numbers and parenthesis

// JAVA: import 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());

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

[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: import 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());

[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: import 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());

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

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

[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: import 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());

[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

Install-Package MathParser.org-mXparser -Version 6.0.0

Nuget – .NET CLI

dotnet add package MathParser.org-mXparser --version 6.0.0

Nuget – Package Reference

<PackageReference Include="MathParser.org-mXparser" Version="6.0.0"/>

###### Maven – Dependency

<dependency><groupid>org.mariuszgromada.math</groupid><artifactid>MathParser.org-mXparser</artifactid><version>6.0.0</version></dependency>

implementation 'org.mariuszgromada.math:MathParser.org-mXparser:6.0.0'

implementation("org.mariuszgromada.math:MathParser.org-mXparser:6.0.0")

###### GitHub

git clone https://github.com/mariuszgromada/MathParser.org-mXparser