About uCalc Fast Math Parser

A math parser for programmers.

uCalc FMP is a 32-bit DLL component which allows your program to evaluate expressions that are defined at runtime. uCalc FMP is a fast, reliable and flexible math engine that allows you to develop applications that allow end users to add their own set of formulas whenever they want instead of having to pre-determine them.  It includes direct support for .NET compilers, Visual Basic, Visual Basic .NET, and Visual C++, Borland C++ Builder, Delphi and PowerBASIC (PB/DLL and PB/CC).

uCalc FMP allows programs to evaluate math expressions that are defined at run time. It parses them, evaluates formulas and performs the calculations with extended precision via 80-bit numbers. uCalc Fast Math Parser performs everything from basic arithmetic to advanced trigonometric calculations. Ease of implementation, flexibility, sturdiness and speed are at the core of the product's design.  It includes direct support for Borland C++ Builder, Delphi, PowerBASIC (PB/DLL and PB/CC), Visual Basic (classic), Visual Basic .NET, and Visual C++.

uCalc FMP in a nutshell
Example 1: This lets the end-user evaluate an expression such as 6+4*5/2

UserExpr$ = InputBox$("Enter an expression",,"6+4*5/2")
Print ucEval(UserExpr$)   ' Returns 16

Example 2: This user expression is very rapidly evaluated in a loop
(See the demo that comes with the download for a more complete example)

UserExpr$ = InputBox$("Enter an expression",,"x^2+x+1")
xPtr = ucDefineVariable("x As Double", VarPtr(x))
ExprPtr = ucParse(UserExpr$)

For x = 1 To 1000000
   SumTotal = SumTotal + ucEvaluate(ExprPtr)

uCalc FMP is used by some Fortune 500 companies from categories such as Aeronautics, Automobile, Banking, Computers, and Securities.

Operators and functions available to end-users
The first section lists functions and operators that are typically familiar, each with a quick description and example.  The subsequent section lists special functions that require additional explanations.

!Factorial5! = 120
^Raised to the power of4 ^ 5 = 1024
*Multiply by3 * 6 = 18
/Divide by9 / 2 = 4.5
\Integer divide by9 \ 2 = 4
modModulo (remainder)7 mod 4 = 3
+Add1 + 1 = 2
-Subtract9 - 5 = 4
-Unary negation-(5+4) = -9
+Concatenate'Zeb' + 'ra' = 'Zebra'
>Greater than (numeric)9 > 2 = -1
<Less than (numeric)7 < 4 = 0
==Equal test (numeric)5 == 4 = 0
>=Greater or equal (numeric)3 >= 3 = -1
<=Less or equal (numeric)#h3E <= 9 = 0
<>Not equal (numeric)#b10101 <> 20 = -1
>Greater than (string)'This' > 'That' = -1
<Less than (string)'This' < 'That' = 0
==Equal test (string)'A' == 'B' = 0
>=Greater or equal (string)'Zeb' >= 'Zebra' = 0
<=Less or equal (string)'Zeb' <= 'Zebra' = -1
<>Not equal (string)'X' <> 'Y' = -1
AndBitwise AND#b101 AND #h1E = 4
OrBitwise OR13 OR 6 = 15
IIFIf condition (numeric)IIf(1+1==2, 4, 5) = 4
IIFIf condition (string)IIf(1, 'T', 'F') = 'T'
MinMinimum valuemin(10, 3) = 3
MaxMaximum valuemax(1, 9, 2) = 9
SinSinesin(pi/2) = 1 (assuming pi is defined)
CosCosinecos(pi) = -1
TanTangenttan(1) = 1.5574...
AtanArc tangentatan(0) = 0
AbsAbsolute valueabs(-8) = 8
Expe to the power ofexp(3) = 20.08...
LogNatural loglog(16) = 2.77...
CeilRound upceil(6.2) = 7
IntTruncate to an integerint(6.8) = 6
FracFractional partfrac(3.125) = 0.125
SgnSign (returns -1, 0, or 1)sgn(-9) = -1
SqrSquare rootsqr(64) = 8

Functions and operators that require further explanation:

Asc(StringArg [, Position])

Returns the ASCII value of a character.  If the Position argument is omitted, then the ASCII value of the first character of the string is returned, otherwise the value of the nth position (starting with 1), as supplied by the Position argument is returned.

Example:       Asc("A")        returns 65

                     Asc("ABC", 3)   returns 67

operand1AndAlso operand2

AndAlso returns True (-1 or 1 depending on the default settings), if operand1 is non-zero and so is operand2.  The And operator always evaluates both operands, whereas AndAlso uses short-circuit evaluation, which means that if operand1 is false (or 0), then AndAlso will return a result without proceeding to evaluate operand2.  This is important in situations where operand2 might evaluate something like a division by 0, or might contain a routine that performs an action such as displaying a message box.  You probably would not want it to go through with evaluating operand2 in such a situation if operand1 is enough to determine the outcome.  See OrElse.

BaseConvert(Number, FromBase)

Converts from a given base to base 10.  Number is a string argument (to allow for non-numeric digits as used in hexadecimal), and FromBase is numeric.

Example:       BaseConvert("101", 2)    returns 5


Returns the character associated with the ASCII value supplied as the Number argument.

Example:       Chr(65)          returns A


See Error

Local(var1 [, var2 [, var3 [, ...]]], Expression)

See Local

Min(a, b [, ...])

Max(a, b [, ...])

These two are actually macro-like items instead of functions.  They take any number of arguments and return the minimum argument (for Min), or the maximum argument (for Max).  They work with both string and numeric arguments.  Arguments must be either all strings or all numbers

operand1OrElse operand2

OrElse returns True (-1 or 1 depending on the default settings), if either operand1 or operand2 is non-zero.  The Or operator always evaluates both operands, whereas OrElse uses short-circuit evaluation, which means that if operand1 is a non-zero value, then OrElse will return a result without proceeding to evaluate operand2.  See AndAlso.


Returns the precedence level of a given operator.  The Operator argument is a string.  This is useful when defining a new operator with the same level as a preexisting one.

Example:       ucDefineOperator "Precedence('+') {x} Plus {y} := x + y"




No parameters

Returns a floating point random number between 0 and 1.  The number chosen is the next in a random sequence.

x > 0

Returns a floating point random number between 0 and 1.  The number chosen is the next in a random sequence.

x = 0

Returns the same random number as the one previously generated.

x < 0

Returns the same random number each time, using the parameter as seed.

a, b

Returns an integer random number between a and b.

SetSyntaxParams(Params, Expression [, Thread])

This adds curly braces { and } around parameters in a string so that this string can be used as a syntax definition.  This allows for the definition of macros, for instance.

Params is a string argument, which contains a list of parameters.  The parameters in the string do not have to be organized in any special way.  uCalc will pick out all alphanumeric elements in the string and treat those as the parameters. Expression is a string containing a definition that is to be parameterized.  That is, curly braces will be added around each alphanumeric occurrence in Expression that was found in Params.  Parameter names are not case sensitive.  The thread argument is optional.  A value of 0 represents the current thread.

The example below shows how you might call SetSyntaxParams.  Here uCalc picks out x, y, and z from Params as parameters.  Occurrences of x, y, and z in the second argument are surrounded by curly braces in the transformed string:


ucEvalStr("SetSyntaxParams('(x, y, z)', 'macro(x, y, z) = sin(x)*y+abc+x-z')")


macro({x}, {y}, {z}) = sin({x})*{y}+abc+{x}-{z}

Here, the first argument could have equally been "x, y, z", "(x y z)", "[x+y+z]", "((x) (y) (z))", etc.

SetVar(VariableName, Value)

This assigns a value to a variable.  The variable can be of just about any data type, and can also be an array element.  However, Value must either be the same type as VariableName, or a compatible type.

uc_For(Counter, Start, Finish, Step, Expression)

This repeats the evaluation of Expression a certain number of times, as in a For/Next loop.  The Counter argument accepts a numeric variable, which will first be set to the value of Start, and then successively be incremented by the amount of Step until the Counter variable reaches the value of Finish, at which point the loop ends.

uc_Loop(DoCondition, Expression, LoopCondition)

This repeats the evaluation of the Expression argument until either DoCondition or LoopCondition is equal to 0.  The value of DoCondition is checked prior to the evaluation of the expression, while the value of LoopCondition is checked after the expression is evaluated.

uCalc(Command [, ...])

uCalcStr(Command [, ...])

uCalc and uCalcStr correspond with the uCalc function.  This allows you to expose all of uCalc's functionality to the end-user.  The end-user can use uCalc or uCalcStr in an expression just like any other function listed in this help file topic.  This function is reserved for the Standard License of uCalc FMP.

New or enhanced in version 2.96

  • Local() and Error() were added.
  • ucDefine() is now available as an end-user function.
  • The last argument of IIF is optional.
  • SetVar (which was already in the DLL) is now declared and available.
  • Exceptions are raised, or NaN or Inf are returned for a ^ b when a < 0, and b is a fractional number, and for sqr(x), log(x), and x!, when x < 0.
  • The ^ operator, and sqr() and log() functions run faster.

New or enhanced in version 2.9+

  • The IIF function now only evaluates either the True argument, or the False one, but not both.
  • The IIF function can work with either numeric or string arguments.
  • String relational (comparison) operators were added.
  • There is no longer any ambiguity between the + operator, the & operator, and the AND operator, for strings and numbers.

Issues for users migrating from version 2.0

  • Version 2.0 had alternative names for a number of functions / operators.  The following alternative names are no longer supported (the item in parenthesis is what remains):  Fact (!), ** (^), DIV (\), =< (<=), => (>=), = (==), | (OR), & (AND), & (+, referring to concatenate), ATN (ATAN), LN (LOG), SQRT (SQR).  You can easily re-instate any of these alternatives as needed.
  • The following items are no longer pre-defined:  XOR, EQV, IMP, ASIN, ACOS, SEC, CSC, COT, Hyperbolic functions (SINH, COSH, TANH, etc.), EXP2, EXP10, LOG2, LOG10,  CONCATENATE, PI.
  • Relational operators (<, >, <>, ==, etc.) now return a -1 instead of 1.  The True value is stored in the memory address returned by ucAddr(uc_True).  One way to change it back to 1 is:

ucDefine "Var: uc_True As Long = 1 ~~ Address: #", ucAddr(uc_True)

  • Rnd was renamed Rand, and has additional functionality.

What you receive when you purchase a Standard License

  • A license code (with instructions) that prevents the opening message box from popping up.
  • The full functionality of uCalc Fast Math Parser (the less expensive Lite License has certain limitations).
  • Entitlement to free upgrades for any new version released within 6 months of your purchase of version 2.96.
  • Entitlement to at least one minor upgrade whenever it may be released.
  • Free serial number for previous versions (upon request).

Note:  Upgrade benefits as described in previous versions will continue to be honored for those who have purchased those versions.

Lite license
The lite license is for those who want a fast math parser, but don't care for advanced features. You can always upgrade later if necessary.
You get a license code that removes the message box, but with limitations.

Lite License limitations

  • Native callback routines (which are much faster) beyond those in the header/include files are reserved for Standard License customers.
  • The following end-user functions (that is functions that can be used in an expression) are disabled when the Lite License option is applied:  uCalc, uCalcStr (uCalc and uCalcStr are still available at the compiler level), uc_For, uc_Loop, SetSyntaxParams, and SetVar.  Syntax constructs that are based on these (such as Macro, Local, etc) are disabled as well.
  • Arrays are restricted.
  • Usage of the Table and Stack types is restricted.
  • ucExpand is disabled.
  • You are limited to 75 syntax definitions (with ucDefineSyntax).

NOTE:  Syntax definitions found in the include file count towards the definition limit, and deplete much of the limit.  Some definitions may internally count as multiple definitions.  You can delete some definitions in the include file in order to make room for definitions of your own if necessary.  For unlimited syntax definitions, get the Standard License.

uCalc Developer Subscription
This entitles you to a license for uCalc Language Builder (Standard), uCalc Fast Math Parser (Standard), uCalc Graphing Calculator, Dacorbi Pattern Search, and all upgrades for these or any new uCalc product with a price tag of less than $1,000 released within the annual subscription period. The yearly subscription is not renewed automatically. The following year you may either re-subscribe, or if you no longer need any upgrades you may keep the product versions you already have.