PROGRAM TO ADD TWO POLYNOMIALS.

#include"stdio.h"
#include"conio.h"

struct barbie
{
int coff;
int pow;
struct barbie *link;
}*ptr,*start1,*node,*start2,*start3,*ptr1,*ptr2;
typedef struct barbie bar;
int temp1,temp2;

void main()
{

void create(void);
void prnt(void);
void suml(void);
void sort(void);
clrscr();

printf("Enrter the elements of the first poly :");
node = (bar *) malloc(sizeof (bar));
start1=node;

if(start1==NULL)
{
printf("Unable to create memory.");
getch();
exit();
}
create();

printf("Enrter the elements of the second poly :");
node = (bar *) malloc(sizeof (bar));
start2=node;
if (start2==NULL)
{
printf("Unable to create memory.");
getch();
exit();
}
create();
clrscr();
//printing the elements of the lists
printf("The elements of the poly first are :");
ptr=start1;
prnt();

printf("The elements of the poly second are :");
ptr=start2;
prnt();

printf("The first sorted list is :");
ptr=start1;
sort();
ptr=start1;
prnt();

printf("The second sorted list is :");
ptr=start2;
sort();
ptr=start2;
prnt();

printf("The sum of the two lists are :");
suml();
ptr=start3;
prnt();

getch();

}

/*-----------------------------------------------------------------------------*/
void create()
{
char ch;
while(1)
{
printf("Enter the coff and pow :");
scanf("%d%d",&node->coff,&node->pow);
if (node->pow==0 )
{
ptr=node;
node=(bar *)malloc(sizeof(bar));
node=NULL;
ptr->link=node;
break;
}

printf("Do u want enter more coff ?(y/n)");
fflush(stdin);
scanf("%c",&ch);
if (ch=='n' )
{
ptr=node;
node=(bar *)malloc(sizeof(bar));
node=NULL;
ptr->link=node;
break;
}
ptr=node;
node=(bar *)malloc(sizeof(bar));
ptr->link=node;
}
}
/*-------------------------------------------------------------------------*/
void prnt()
{ int i=1;

while(ptr!=NULL )
{
if(i!=1)
printf("+ ");
printf(" %dx^%d ",ptr->coff,ptr->pow);
ptr=ptr->link;
i++;
}
//printf(" %d^%d",ptr->coff,ptr->pow);
}
/*---------------------------------------------------------------------------*/
void sort()
{
for(;ptr->coff!=NULL;ptr=ptr->link)
for(ptr2=ptr->link;ptr2->coff!=NULL;ptr2=ptr2->link)
{
if(ptr->pow>ptr2->pow)
{
temp1=ptr->coff;
temp2=ptr->pow;
ptr->coff=ptr2->coff;
ptr->pow=ptr2->pow;
ptr2->coff=temp1;
ptr2->pow=temp2;

}
}
}
/*---------------------------------------------------------------------------*/
void suml()
{
node=(bar *)malloc (sizeof(bar));
start3=node;

ptr1=start1;
ptr2=start2;

while(ptr1!=NULL && ptr2!=NULL)
{
ptr=node;
if (ptr1->pow > ptr2->pow )
{
node->coff=ptr2->coff;
node->pow=ptr2->pow;
ptr2=ptr2->link; //update ptr list B
}
else if ( ptr1->pow <>pow )
{
node->coff=ptr1->coff;
node->pow=ptr1->pow;
ptr1=ptr1->link; //update ptr list A
}
else
{
node->coff=ptr2->coff+ptr1->coff;
node->pow=ptr2->pow;
ptr1=ptr1->link; //update ptr list A
ptr2=ptr2->link; //update ptr list B

}

node=(bar *)malloc (sizeof(bar));
ptr->link=node; //update ptr list C
}//end of while

if (ptr1==NULL) //end of list A
{
while(ptr2!=NULL)
{
node->coff=ptr2->coff;
node->pow=ptr2->pow;
ptr2=ptr2->link; //update ptr list B
ptr=node;
node=(bar *)malloc (sizeof(bar));
ptr->link=node; //update ptr list C
}
}

else if (ptr2==NULL) //end of list B
{
while(ptr1!=NULL)
{
node->coff=ptr1->coff;
node->pow=ptr1->pow;
ptr1=ptr1->link; //update ptr list B
ptr=node;
node=(bar *)malloc (sizeof(bar));
ptr->link=node; //update ptr list C
}
}
node=NULL;
ptr->link=node;
}

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