polynomial operations using c 2b 2b

1//Addition of Two Polynomial
2
3#include <iostream.h>
4#include <iomanip.h>
5#include <conio.h>
6
7struct poly{
8    int coeff;
9    int pow;
10    poly *next;
11};
12
13class add2poly
14{
15   poly *poly1, *poly2, *poly3;
16   public:
17   add2poly(){poly1=poly2=poly3=NULL;}
18   void addpoly();
19   void display();
20};
21
22void add2poly :: addpoly(){
23      int i,p;
24      poly *newl=NULL,*end=NULL;
25      cout<<"Enter highest power for x\n";
26      cin>>p;
27    //Read first poly
28      cout<<"\nFirst Polynomial\n";
29      for(i=p;i>=0;i--)
30      {
31      newl=new poly;
32      newl->pow=p;
33      cout<<"Enter Co-efficient for degree"<<i<<"::  ";
34      cin>>newl->coeff;
35      newl->next=NULL;
36      if(poly1==NULL)
37         poly1=newl;
38      else
39         end->next=newl;
40      end=newl;
41      }
42
43    //Read Second poly
44      cout<<"\n\nSecond Polynomial\n";
45      end=NULL;
46      for(i=p;i>=0;i--)
47      {
48      newl=new poly;
49      newl->pow=p;
50      cout<<"Enter Co-efficient for degree"<<i<<"::  ";
51      cin>>newl->coeff;
52      newl->next=NULL;
53      if(poly2==NULL)
54         poly2=newl;
55      else
56         end->next=newl;
57      end=newl;
58      }
59
60      //Addition Logic
61      poly *p1=poly1,*p2=poly2;
62      end=NULL;
63      while(p1 !=NULL && p2!=NULL){
64        if(p1->pow == p2->pow){
65            newl=new poly;
66            newl->pow=p--;
67            newl->coeff=p1->coeff + p2->coeff;
68            newl->next=NULL;
69            if(poly3==NULL)
70               poly3=newl;
71            else
72               end->next=newl;
73            end=newl;
74        }
75        p1=p1->next;
76        p2=p2->next;
77      }
78}
79
80void add2poly :: display(){
81   poly *t=poly3;
82   cout<<"\n\nAnswer after addition is : ";
83   while(t!=NULL){
84      cout.setf(ios::showpos);
85      cout<<t->coeff;
86      cout.unsetf(ios::showpos);
87      cout<<"X"<<t->pow;
88      t=t->next;
89   }
90}
91
92
93void main(){
94    clrscr();
95    add2poly obj;
96    obj.addpoly();
97    obj.display();
98    getch();
99}