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Eval is an expression evaluator module. It evaluates almost any Visual Basic expression. You can accept expressions from the users and calculate the result with a simple call.
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Eval is an expression evaluator module and math parser for Visual Basic 6.0. It evaluates almost any VB6 expression. You can accept expressions from users and calculate the result with a simple call.
Just one function call is required:
Evaluate(Expression)
Use it to add calculation capabilities to your programs. For example, Evaluate("7+2^3") returns 15. Here are a few examples of what you application might do:
  • Calculate a simple mathematical formula like "1+2+3".
  • Accept any formula like "x + y^2", substitute variable values and get the result.
  • Draw curves from user-defined formulas.
  • Build your own calculator. Add expressions to your own programming language or macro system

Eval is simple to use. Here is an example.

Supported expressions Eval can handle all Visual Basic constant expressions:
  • Numbers (decimal, octal, hexa) and string literals
  • Numeric operators: all arithmetic, comparison and logical operators (+ - * / \ ^ Mod, etc.)
  • String concatenation and Like
  • The keywords Empty and Null
  • Basic single-argument functions like CInt(), Abs() or Sgn()