"The code is exactly
how I would like to write code and the algorithms used are very
efficient and well-documented."
Van T. Dinh, Microsoft MVP
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Class: CExpressionEvaluator
Class to implement expression evaluation.
Expression evaluation is a common need in many programs, especially if you deal with numbers and operators.
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Procedure Name
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Type
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Description
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(Declarations)
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Declarations
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Declarations and private variables for the CExpressionEvaluator class
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Expression
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Property
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Gets the expression to evaluate.
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Postfix
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Property
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Gets the postfix representation of the expression string
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CharType
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Private
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Determines the type of the current character
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Class_Initialize
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Initialize
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Set initial values to defaults which may be overridden with property settings
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ConvertToPostfix
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Private
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Converts the expression to postfix and stores the result in m_strPostfix
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Evaluate
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Method
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Evaluates the expression. For simplicity the postfix representation of the expression is evaluated.
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GetNextToken
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Private
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Returns the next token in the string identified by the text property
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HandleSeparator
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Private
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Handles a separator character
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HandleToken
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Private
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Handles a token character
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HandleWhiteSpace
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Private
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Handles a whitespace character
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ParseExpression
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Private
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Parses an expression
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ParseFactor
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Private
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Parses a factor
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ParseTerm
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Private
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Parse a term. A term is something like 2+7, or 1 + sin(1), while a token is the smallest meaningful piece of data, such as 2 or sin
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PopResult
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Private
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Pops an item off the stack
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PushResult
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Private
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Pushes an item onto the stack
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SetTokenString
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Private
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Set the string used by the tokenizer
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