Calculator Expression

calculator_expression.cs

public abstract class Expression
{
    public abstract string TokenLiteral();
}
//IntegerExpression.cs
public class IntegerExpression : Expression
{
    public Token Token { get; set; }
    public long Value { get; set; }
   //...
    public override string ToString()
    {
        return $"{Value}";
    }
}
// PrefixExpression.cs
public class PrefixExpression : Expression
{
    public Token Token { get; set; }
    public Expression Right { get; set; }
    public string Operator { get; set; }
    public override string ToString()
    {
        return $"({Token.Literal} {Right.ToString()})";
    }
}
//InfixExpression.cs
public class InfixExpression : Expression
{
    public Expression Left { get; set; }
    public Expression Right { get; set; }
    public Token Token { get; set; }
    public string Operator { get; set; 
    public override string ToString()
    {
        return $"({Left.ToString()} {Token.Literal} {Right.ToString()})";
    }
}