Program.java

Program

Program can be written as the following Algebraic Data Type (ADT)

Program = Assignment(identifier: Identifier, expression: Expression)
        | Composition(first: Program, second: Program)
        | Loop(condition: Expression, program: Program)
        | Conditional(condition: Expression, thenCase: Program, elseCase: Program)
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package program;
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Program is the abstract common class for programs that can be executed using the Interpreter. 

abstract public class Program { }