The Interpreter Design Pattern is a behavioral design pattern that is used to interpret and evaluate a grammar language or expression. It provides a mechanism to evaluate sentences in a language by representing their grammar as a set of classes. Each class corresponds to a specific rule or part of the language’s grammar, and these classes can be organized hierarchically to handle more complex expressions.
In my assignment-1, the interpreter design pattern is demonstrated through the implementation of a simple calculator capable of performing four basic mathematical operations: Addition, Subtraction, Multiplication, Division.
Components of the Interpreter Design Pattern Implemented:
- Expression Interface
- Terminal Expressions: NumberExpression
- Non-Terminal Expressions: AddExpression, SubtractExpression, MultiplyExpression, DivideExpression
The Expression Interface provides a common method Interpret() that all concrete expression classes implement. NumberExpression is used for representing numbers. AddExpression, SubtractExpression, MultiplyExpression, and DivideExpression represent operations that manipulate instances of Expression to compute results.