Polynomial Multiplication using Linked List

 #include<stdio.h>

#include<stdlib.h>
struct node
{
int coeff,exp;
struct node *link;
}*A=NULL,*B=NULL,*S=NULL,*P=NULL;

struct node * create()
{
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 display(struct node*temp)
{
while(temp!=NULL)
     {
      printf("%dx^%d ---> ",temp->coeff,temp->exp);
      temp=temp->link;
     }
printf("NULL\n");
}
struct node * polyadd(struct node*P1, struct node *P2)
{
struct node *P3=NULL,*lastP3=NULL,*temp=NULL;
if(P1==NULL) P3=P2;
else if(P2==NULL) P3=P1;
else
{
while(P1!=NULL && P2!= NULL)
     {

    if(P2->exp > P1->exp)
{
temp=(struct node*)malloc(sizeof(struct node));
temp->coeff=P2->coeff;
temp->exp=P2->exp;
temp->link=NULL;

if(P3==NULL)
 {
    P3=temp;
    lastP3=temp; 
 }
 else
  {
    lastP3->link=temp;
    lastP3=temp;
   }
 P2=P2->link;
}
     else if(P2->exp < P1->exp)
{
temp=(struct node*)malloc(sizeof(struct node));
temp->coeff=P1->coeff;
temp->exp=P1->exp;
temp->link=NULL;
if(P3==NULL)
{
  P3=temp;
  lastP3=temp;
  }
else
   {
    lastP3->link=temp;
    lastP3=temp;
    }
    P1=P1->link;
}
      else
{
temp=(struct node*)malloc(sizeof(struct node));
temp->coeff=P1->coeff+P2->coeff;
temp->exp=P1->exp;
temp->link=NULL;
if(P3==NULL)
     {
       P3=temp;
       lastP3=temp;
      }
     else
       {
      lastP3->link=temp;
       lastP3=temp;
       }
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;
     }
 }
return P3;
}

struct node *polymult(struct node *P1,struct node *P2)
{ 
struct node *CTEMP,*LCTEMP,*P=NULL,*temp;
while(P1!=NULL)
 {
    P2=B;
    CTEMP=NULL;
  while(P2!=NULL)
    {
     temp=(struct node*)malloc(sizeof(struct node));
     temp->link=NULL;
     temp->coeff=P1->coeff*P2->coeff;
     temp->exp=P1->exp+P2->exp;
     if(CTEMP==NULL) {CTEMP=temp;LCTEMP=temp;}
     else{LCTEMP->link=temp;LCTEMP=temp;}
     P2=P2->link;
    }
  display(CTEMP);
  P=polyadd(P,CTEMP);
  P1=P1->link;
 }
 return P;
}
void main()
{
int ch;
do
  {
   printf("\n\n 1. Create Poly \n 2. Multiply Poly \n 3. Display Poly \n 4. Exit  ");
   printf("\n    Enter Option : ");
   scanf("%d",&ch);
   switch(ch)
{
 case 1:
        A=create();
        B=create();
        break;
 case 2:
       P=polymult(A,B);
       printf("Polinomial Product..\n");
       display(P);
       break;
 case 3:  
       printf("\n    Polynomial A : ");
       display(A);
       printf("\n    Polynomial B : ");
       display(B);
       break;
 case 4:
       exit(0);
 default :
       printf("\n    Invalid Option !!!");
}
  }
while(1);
}

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