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POoverloading stream operator >> for polynomials
 

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  1. POoverloading stream operator >> for polynomials
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    <p>how could I overload input stream operator for this code:</p> <pre><code>struct Node { int degree; int coeff; Node* link; }; Node* cons (int c,int d,Node* p); Node* doCancelation(int d,Node* p); class polynomial { private: Node* poly; static const int CHAR='X'; char character; public: polynomial(); polynomial(int c,int d); //void printPoly()const; void insert (int c,int d); int degree() const; int coeff(int d) const; void setPrintVariable(char x); // changes the variable used when printing the polynomial char getPrintVariable() const; // returns the variable used when printing the polynomial friend std::ostream&amp; operator &lt;&lt; (std::ostream &amp;output, const polynomial &amp;a); friend std::istream&amp; operator &gt;&gt; (std::istream &amp;input, polynomial&amp;a); }; polynomial::polynomial() { poly= new Node; poly=NULL; } polynomial::polynomial(int c,int d) { character = CHAR; poly= new Node; poly-&gt;coeff=c; poly-&gt;degree=d; poly-&gt;link=NULL; } void polynomial::setPrintVariable(char x) { character=x; } char polynomial::getPrintVariable() const { return character; } void polynomial::insert (int c,int d) { if(poly==NULL) { poly=cons(c,d,poly); return; } if(d&lt;poly-&gt;degree) { poly=cons(c,d,poly); return; } if(d==poly-&gt;degree) { if(c==-(poly-&gt;coeff)) poly=doCancelation(d,poly); else poly-&gt;coeff += c; return; } Node* q=poly; Node* r=q-&gt;link; while(r!=NULL &amp;&amp; d&gt;=r-&gt;degree) { if(d==r-&gt;degree) { if(c==-(r-&gt;coeff)) poly=doCancelation(d,poly); else r-&gt;coeff += c; return; } q=r; r=r-&gt;link; } q-&gt;link=cons(c,d,r); } Node* doCancelation(int d,Node* p) { if(p==NULL)return p; if(p-&gt;degree==d) { Node* q=p-&gt;link; delete p; return q; } else { p-&gt;link = doCancelation (d,p-&gt;link); return p; } } std::ostream&amp; operator &lt;&lt; (std::ostream &amp;output, const polynomial &amp;a) { Node* q=a.poly; if(a.poly==NULL) output&lt;&lt;"( )"; else while(q != NULL) { output&lt;&lt;std::showpos&lt;&lt;q-&gt;coeff&lt;&lt;std::noshowpos&lt;&lt;'x'&lt;&lt;"^"&lt;&lt;q-&gt;degree&lt;&lt;" "; q=q-&gt;link; } return output; } const polynomial operator +(const polynomial &amp;a,const polynomial &amp;b ) { } int polynomial::degree() const { Node* q=poly; if(poly==NULL) return 0; while(q-&gt;link !=NULL) q=q-&gt;link; return q-&gt;degree; } int polynomial::coeff(int d) const { Node* q=poly; if(poly==NULL) return 0; while(q !=NULL &amp;&amp; d &lt;= q-&gt;degree) { if(d==q-&gt;degree) return q-&gt;coeff; q=q-&gt;link; } return 0; } Node* cons (int c,int d,Node* p) { Node* q= new Node; q-&gt;coeff=c; q-&gt;degree=d; q-&gt;link=p; return q; } </code></pre>
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    1. USPotatoswatter
    1. USfemchi
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    1. PO
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      1. POoverloading stream operator >> for polynomials
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      1. VTUpMod
    1. CODo you have a specific idea what it should look like? What have you tried so far? Did you encounter any *specific* problems?
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      1. POoverloading stream operator >> for polynomials
      1. USBjörn Pollex
    2. CO@space:unfortunately for input stream I dont have any idea. I want user can write polynomials like this:= 1 + x + x^2 + x^3 + x^4
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      1. POoverloading stream operator >> for polynomials
      1. USfemchi
    3. COI'd read up on the STL parts of the standard library. Your `Node` looks like you're reinventing `std::list`. This adds a lot of code to your class, which makes it far more complex than it should be.
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      1. POoverloading stream operator >> for polynomials
      1. USMSalters
 

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