Implied multiplication

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Below is the code for JAVA, the code for C# is almost identical.

Case 1: Numbers and parenthesis

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.5.0.0] 2(3+4)3 = 2*(3+4)*3
[mXparser-v.5.0.0] Res: 2(3+4)3 = 42.0

Case 2: Numbers and constants / arguments

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.5.0.0] 2pi+3e = 2*pi+3*e
[mXparser-v.5.0.0] Res: 2pi+3e = 14.438030792556722

Case 3: Numbers and constants / arguments and parenthesis

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.5.0.0] 2pi(3+4)2e = 2*pi*(3+4)*2*e
[mXparser-v.5.0.0] Res: 2pi(3+4)2e = 239.11255823485985

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

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.5.0.0] 2pi(3+4)2sin(3)e = 2*pi*(3+4)*2*sin(3)*e
[mXparser-v.5.0.0] Res: 2pi(3+4)2sin(3)e = 33.74356614531889

Case 5: Implied multiplication and possible ambiguity

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

[mXparser-v.5.0.0] 2pi2 = 2*pi2
[mXparser-v.5.0.0] [2pi2] checking ...
[2pi2] (pi2, 2) invalid <TOKEN>.
[2pi2] errors were found.
[mXparser-v.5.0.0]

Case 6: Implied multiplication and list of tokens

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

[mXparser-v.5.0.0]  --------------------
[mXparser-v.5.0.0] | Expression tokens: |
[mXparser-v.5.0.0]  ---------------------------------------------------------------------------------------------------------------
[mXparser-v.5.0.0] |    TokenIdx |       Token |        KeyW |     TokenId | TokenTypeId |  TokenLevel |  TokenValue |   LooksLike |
[mXparser-v.5.0.0]  ---------------------------------------------------------------------------------------------------------------
[mXparser-v.5.0.0] |           0 |           2 |             |           1 |           0 |           0 |         2.0 |             |
[mXparser-v.5.0.0] |           1 |           * |             |           3 |           1 |           0 |         NaN |             |
[mXparser-v.5.0.0] |           2 |          pi |             |           1 |           9 |           0 |         NaN |             |
[mXparser-v.5.0.0] |           3 |           * |             |           3 |           1 |           0 |         NaN |             |
[mXparser-v.5.0.0] |           4 |           ( |           ( |           1 |          20 |           1 |         NaN |             |
[mXparser-v.5.0.0] |           5 |           3 |       _num_ |           1 |           0 |           1 |         3.0 |             |
[mXparser-v.5.0.0] |           6 |           + |           + |           1 |           1 |           1 |         NaN |             |
[mXparser-v.5.0.0] |           7 |           4 |       _num_ |           1 |           0 |           1 |         4.0 |             |
[mXparser-v.5.0.0] |           8 |           ) |           ) |           2 |          20 |           1 |         NaN |             |
[mXparser-v.5.0.0] |           9 |           * |             |           3 |           1 |           0 |         NaN |             |
[mXparser-v.5.0.0] |          10 |           2 |             |           1 |           0 |           0 |         2.0 |             |
[mXparser-v.5.0.0] |          11 |           * |             |           3 |           1 |           0 |         NaN |             |
[mXparser-v.5.0.0] |          12 |           e |             |           2 |           9 |           0 |         NaN |             |
[mXparser-v.5.0.0]  ---------------------------------------------------------------------------------------------------------------

Case 7: Enable / disable implied multiplication

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.5.0.0] Disable: 
[2pi+3e] checking ...
[2pi+3e] (2pi, 0) invalid <TOKEN>.
[2pi+3e] (3e, 2) invalid <TOKEN>.
[2pi+3e] errors were found.
[mXparser-v.5.0.0] Enable: 
[2pi+3e] checking ...
[2pi+3e] no errors.
[mXparser-v.5.0.0]