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POaccessing data members in a Linkedlist
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2013-07-14T18:23:51.723
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<pre><code>if (polynomial1->get(0)->compareTo(polynomial2->get(0)) == 0) { polynomial1->get(0)->coefficient += polynomial2->get(0)->coefficient; result->insert_tail->polynomial1->get(0); } </code></pre> <code>Polynomial1</code> and <code>Polynomial2</code> are both Linked Lists and I am adding polynomial terms together one node at a time. In my compareTo function if both the terms in the linked lists == 0 then I want access the coefficient and add the coefficient of both terms together. My problem is accessing the coefficient. I keep getting the error message: <blockquote> class <code>Data</code> has no member named <code>‘coefficient’</code> </blockquote> But my <code>PolynomialTerm</code> class inherits <code>Data</code>. Any help on accessing the coefficient? <pre><code>class PolynomialTerm : public Data { public: int coefficient; Variable *variable; PolynomialTerm(int coefficient, Variable *variable) : coefficient(coefficient), variable(variable) { } int compareTo(Data *other) const { PolynomialTerm * otherTerm = (PolynomialTerm*)other; return variable->variableX == otherTerm->variable->variableX && variable->variableX == otherTerm->variable->variableX && variable->exponentX == otherTerm->variable->exponentX && variable->exponentY == otherTerm->variable->exponentY ? 0 : variable->exponentX > otherTerm->variable->exponentX || variable->exponentY > otherTerm->variable->exponentY ? -1 : 1; } </code></pre> ---edit-- here is also my Data class which is located in my header file. <pre><code>class Data { public: virtual ~Data() {} /** * Returns 0 if equal to other, -1 if < other, 1 if > other */ virtual int compareTo(Data * other) const = 0; /** * Returns a string representation of the data */ virtual string toString() const = 0; }; </code></pre>
Tags
<c++><linked-list><polynomial-math>
Title
accessing data members in a Linkedlist
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1. COPlease post the definition of `class Data`.
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 POaccessing data members in a Linkedlist
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 USThomas Matthews

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