Expression Evaluation

Environment: VC 4.0/5.0

I made this code while working on a program for analyzing mathematical expressions, and I made some classes for making things easier.

See sample code: express.zip ; the programme was writen using MSVC 4.0 and compiled with MSVC 5.0

This classes can be used for evaluating expressions like :

1+4*(5+9) or

1+var1+var2*(5+b5), where var1 , var2 can be: numeric values or expressions or other numeric stuff. See the sample code.

The class hierarchy that I implemented is :

CExpression derived from CObject - represents a mathematical expression; use ChangeExpression to assign a string expression to the expression object

The folowing mathematical functions are known: sin, cos, exp, sqrt, log, tg, ctg, asin, acos, atg and the default operations like +, -,  *, /, ^ - (pow()); the abs function is implemented using: |expresion|.

CValue derived from CObject - represents a value; use SetValue/GetValue - to set / get the value, or UpdateValue to Update the value

CExpValue derived from CValue - represents a value that is defined by a expresion

CNumericValue derived from CValue - represents a simple numeric value

The best way of understanding the way that this classes are functioning is to see the sample project.

If you have some questions or you have some improvement ideas, or you find a bug please send me a mail to: zolyfarkas@usa.net or zoly@csoft.dnttm.ro

See sample code: express.zip



Comments

Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • Microsoft® Office 365 is a top choice for enterprises that want a cloud-based suite of productivity/ collaboration applications. With Office 365, you get access to Microsoft™ Office solutions practically anytime, anywhere, on virtually any device. It's a great option for current Microsoft users who can now build on their experience with Microsoft™ solutions while enjoying the flexibility of a cloud-based delivery. But even organizations with no previous investment in Microsoft will find that …

  • The future of cloud platforms is at hand. Even if your cloud applications are basic now, your next set of apps will require strong analytics services and tools, as well as features that ease enterprise integration. To fill these needs, consider using not only your current cloud provider but also specialists. Take advantage of not only the big cloud platforms, but also specialized providers in vertical industries; countries and regions; and functional domains including omnichannel, analytics, integration, and …

Most Popular Programming Stories

More for Developers

RSS Feeds

Thanks for your registration, follow us on our social networks to keep up-to-date