using System;+
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using System.Collections.Generic;+
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using System.Text;+
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+
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public abstract class Statement+
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{+
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}+
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+
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public class DeclareVariable : Statement+
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{+
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    public string Identifier;+
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    public Expression Expression;+
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}+
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+
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public class DeclareFunction : Statement +
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{+
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    public string FunctionName;+
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    public DeclareVariable Parameter1;+
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    public DeclareVariable Parameter2;+
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    public DeclareVariable Parameter3;+
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    public String ReturnType;+
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    public Statement Body;+
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}+
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+
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public class CallFunction : Statement +
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{+
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    public string FunctionName;+
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    public Expression Parameter1;+
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    public Expression Parameter2;+
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    public Expression Parameter3;+
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    public Identifier ReturnVariable;+
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}+
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+
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public class Write : Statement+
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{+
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    public Expression Expression;+
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}+
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+
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public class Assignment : Statement+
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{+
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    public string Identifier;+
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    public Expression Expression;+
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}+
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+
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public class For : Statement+
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{+
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    public string Identifier;+
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    public Expression From;+
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    public Expression To;+
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    public Statement Body;+
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}+
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+
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public class IfThenElse : Statement+
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{+
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    public Expression If;+
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    public Statement Then;+
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    public Statement Else;+
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}+
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+
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public class IfThen : Statement+
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{+
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    public Expression LeftExpression;+
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    public RelationalOperands Operand;+
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    public Expression RightExpression;+
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    public Statement ThenBody;+
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    public Statement ElseBody;+
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}+
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+
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public class While : Statement+
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{+
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    public Expression LeftExpression;+
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    public RelationalOperands Operand;+
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    public Expression RightExpression;+
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    public Statement Body;+
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}+
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+
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public class ReadInput : Statement+
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{+
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    public string Identifier;+
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}+
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+
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public class StatementSequence : Statement+
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{+
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    public Statement Left;+
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    public Statement Right;+
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}+
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+
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public abstract class Expression+
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{+
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}+
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+
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public class AlphaNumericValue : Expression+
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{+
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    public string Value;+
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}+
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+
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public class NumericValue : Expression+
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{+
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    public int Value;+
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}+
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+
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public class Identifier : Expression+
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{+
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    public string IdentifierName;+
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}+
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+
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public class ArithmaticExpression : Expression+
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{+
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    public Expression Left;+
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    public Expression Right;+
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    public ArithmaticOperands Operand;+
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}+
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+
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public enum ArithmaticOperands+
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{+
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    Add,+
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    Subtract,+
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    Multiply,+
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    Division+
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}+
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+
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public class LogicalExpression : Expression+
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{+
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    public Expression Left;+
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    public Expression Right;+
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    public LogicalOperands Operand;+
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}+
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+
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public enum LogicalOperands+
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{+
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    Or,+
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    And,+
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    Xor,+
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    Not+
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}+
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+
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public class RelationalExpression : Expression+
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{+
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    public Expression Left;+
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    public Expression Right;+
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    public RelationalOperands Operand;+
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}+
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+
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public class CompareVariable : Statement+
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{+
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    public string Identifier;+
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    public Expression Expression;+
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    public RelationalOperands Operand;+
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}+
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+
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public enum RelationalOperands+
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{+
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    EqualTo,+
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    NotEqualTo,+
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    LessThan,+
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    LessThanOrEqualTo,+
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    GreaterThan,+
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    GreaterThanOrEqualTo+
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}+
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