Polynomial Addition using Linked List

Learn Theory-Polynomials

#include<stdio.h>
#include<stdlib.h>
struct node
{
int coeff,exp;
struct node *link;
}*P1=NULL,*P2=NULL,*P3=NULL,*temp,*lastP3;

struct node * createpoly()
{
    struct node *TP=NULL,*temp=NULL,*LTP=NULL;
int n,coeff,exp,i;
printf("\n Enter no of Terms of Poly  : ");
scanf("%d",&n);
printf("\n Enter Coefficint and Exponent of Poly in order(k1x^n+k2x^n-1..+knx^0  : ");
for(i=0;i<n;i++)
   {
    scanf("%d%d",&coeff,&exp);
    temp=(struct node*)malloc(sizeof(struct node));
    temp->coeff=coeff;
    temp->exp=exp;
    temp->link=NULL;
    if(TP==NULL)
      {
       TP=temp;
       LTP=temp;
      }
    else
      {
       LTP->link=temp;
       LTP=temp;
      }
    }
    return TP;
}
void displaypoly(struct node*temp)
{
while(temp!=NULL)
     {
      printf("%dx^%d ---> ",temp->coeff,temp->exp);
      temp=temp->link;
     }
printf("NULL\n");
}
void createtempnode(int co,int ex)
{
  temp=(struct node*)malloc(sizeof(struct node));
temp->coeff=co;
temp->exp=ex;
temp->link=NULL;
}
void addtoP3()
{
if(P3==NULL)
{
    P3=temp;
    lastP3=temp; 
}
else
  {
    lastP3->link=temp;
    lastP3=temp;
   }
}
struct node polyadd(struct node*P1, struct node *P2)
{
if(P1==NULL) P3=P2;
else if(P2==NULL) P3=P1;
else
{
while(P1!=NULL && P2!= NULL)
{

    if(P1->exp > P2->exp)
{
    createtempnode(P1->coeff,P1->exp);
    addtoP3();
    P1=P1->link;
}
     else if(P2->exp > P1->exp)
{
createtempnode(P2->coeff,P2->exp);
    addtoP3();
    P2=P2->link;
}
      else
{
createtempnode(P1->coeff+P2->coeff,P1->exp);
    addtoP3();

P1=P1->link;
P2=P2->link;
    }
 }
while(P1!=NULL)
     {
      lastP3->link=P1;
      lastP3=P1;
      P1=P1->link;
     }
while(P2!=NULL)
     {
      lastP3->link=P2;
      lastP3=P2;
      P2=P2->link;
     }

}
}
void main()
{
            printf("Create polynomial P1\n");
       P1=createpoly();
       printf("Create polynomial P2\n");
       P2=createpoly();
       printf("Polynomial P1\n");
     displaypoly(P1);
     printf("Polynomial P2\n");
    displaypoly(P2);
            polyadd(P1,P2);
            printf("Sum of  polynomial P1 and P2\n");
            displaypoly(P3);
}

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