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  • Your email address will not be published.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

  • On-demand Event Event Date: February 12, 2015 The evolution of systems engineering with the SysML modeling language has resulted in improved requirements specification, better architectural definition, and better hand-off to downstream engineering. Agile methods have proven successful in the software domain, but how can these methods be applied to systems engineering? Check out this webcast and join Bruce Powel Douglass, author of Real-Time Agility, as he discusses how agile methods have had a tremendous …

  • The mobile market is white hot. Building a well-crafted product development plan that addresses market research, strategy, design, and development will provide the greatest chance for success. Each phase of an app's lifecycle is critical to the its overall success and feeds into the next step of the process of product development for the app. This white paper examines the five key phases of mobile app creation, one by one, to understand how they work together to help create a successful mobile app.

Most Popular Programming Stories

More for Developers

RSS Feeds

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