#include <stdio.h>
#include <conio.h>
#include <malloc.h>
struct node
{
int num;
int coeff;
struct node *next;
};
struct node *start1 = NULL;
struct node *start2 = NULL;
struct node *start3 = NULL;
struct node *start4 = NULL;
struct node *last3 = NULL;
struct node *create_poly(struct node *);
struct node *display_poly(struct node *);
struct node *add_poly(struct node *, struct node *, struct node *);
struct node *sub_poly(struct node *, struct node *, struct node *);
struct node *add_node(struct node *, int, int);
int main()
{
int option;
clrscr();
do
{
printf("\n******* MAIN MENU *******");
printf("\n 1. Enter the first polynomial");
printf("\n 2. Display the first polynomial");
printf("\n 3. Enter the second polynomial");
printf("\n 4. Display the second polynomial");
printf("\n 5. Add the polynomials");
printf("\n 6. Display the result");
printf("\n 7. Subtract the polynomials");
printf("\n 8. Display the result");
printf("\n 9. EXIT");
printf("\n\n Enter your option : ");
scanf("%d", &option);
switch(option)
{
case 1: start1 = create_poly(start1);
break;
case 2: start1 = display_poly(start1);
break;
case 3: start2 = create_poly(start2);
break;
case 4: start2 = display_poly(start2);
break;
case 5: start3 = add_poly(start1, start2, start3);
break;
case 6: start3 = display_poly(start3);
break;
case 7: start4 = sub_poly(start1, start2, start4);
break;
case 8: start4 = display_poly(start4)
break;
}
}while(option!=9);
getch();
return 0;
}
struct node *create_poly(struct node *start)
{
struct node *new_node, *ptr;
int n, c;
printf("\n Enter the number : ");
scanf("%d", &n);
printf("\t Enter its coefficient : ");
scanf("%d", &c);
while(n != –1)
{
if(start==NULL)
{
new_node = (struct node *)malloc(sizeof(struct node));
new_node -> num = n;
new_node -> coeff = c;
new_node -> next = NULL;
start = new_node;
}
else
{
ptr = start;
while(ptr -> next != NULL)
ptr = ptr -> next;
new_node = (struct node *)malloc(sizeof(struct node));
new_node -> num = n;
new_node -> coeff = c;
new_node -> next = NULL;
ptr -> next = new_node;
}
printf("\n Enter the number : ");
scanf("%d", &n);
if(n == –1)
break;
printf("\t Enter its coefficient : ");
scanf("%d", &c);
}
return start;
}
struct node *display_poly(struct node *start)
{
struct node *ptr;
ptr = start;
while(ptr != NULL)
{
printf("\n%d x %d\t", ptr -> num, ptr -> coeff);
ptr = ptr -> next;
}
return start;
}
struct node *add_poly(struct node *start1, struct node *start2, struct node *start3)
{
struct node *ptr1, *ptr2;
int sum_num, c; ptr1 = start1, ptr2 = start2;
while(ptr1 != NULL && ptr2 != NULL)
{
if(ptr1 -> coeff == ptr2 -> coeff)
{
sum_num = ptr1 -> num + ptr2 -> num;
start3 = add_node(start3, sum_num, ptr1 -> coeff);
ptr1 = ptr1 -> next;
ptr2 = ptr2 -> next;
}
else if(ptr1 -> coeff > ptr2 -> coeff)
{
start3 = add_node(start3, ptr1 -> num, ptr1 -> coeff);
ptr1 = ptr1 -> next;
}
else if(ptr1 -> coeff < ptr2 -> coeff)
{
start3 = add_node(start3, ptr2 -> num, ptr2 -> coeff);
ptr2 = ptr2 -> next;
}
}
if(ptr1 == NULL)
{
while(ptr2 != NULL)
{
start3 = add_node(start3, ptr2 -> num, ptr2 -> coeff);
ptr2 = ptr2 -> next;
}
}
if(ptr2 == NULL)
{
while(ptr1 != NULL)
{
start3 = add_node(start3, ptr1 -> num, ptr1 -> coeff);
ptr1 = ptr1 -> next;
}
}
return start3;
}
struct node *sub_poly(struct node *start1, struct node *start2, struct node *start4)
{
struct node *ptr1, *ptr2;
int sub_num, c;
ptr1 = start1, ptr2 = start2;
do
{
if(ptr1 -> coeff == ptr2 -> coeff)
{
sub_num = ptr1 -> num – ptr2 -> num;
start4 = add_node(start4, sub_num, ptr1 -> coeff);
ptr1 = ptr1 -> next;
ptr2 = ptr2 -> next;
}
else if(ptr1 -> coeff > ptr2 -> coeff)
{
start4 = add_node(start4, ptr1 -> num, ptr1 -> coeff);
ptr1 = ptr1 -> next;
}
else if(ptr1 -> coeff < ptr2 -> coeff{
start4 = add_node(start4, ptr2 -> num, ptr2 -> coeff);
ptr2 = ptr2 -> next;
}while(ptr1 != NULL || ptr2 != NULL);
if(ptr1 == NULL)
{
while(ptr2 != NULL)
{
start4 = add_node(start4, ptr2 -> num, ptr2 -> coeff);
ptr2 = ptr2 -> next;
}
}
if(ptr2 == NULL)
{
while(ptr1 != NULL)
{
start4 = add_node(start4, ptr1 -> num, ptr1 -> coeff);
ptr1 = ptr1 -> next;
}
}
return start4;
}
struct node *add_node(struct node *start, int n, int c)
{
struct node *ptr, *new_node;
if(start == NULL)
{
new_node = (struct node *)malloc(sizeof(struct node));
new_node -> num = n;
new_node -> coeff = c;
new_ node -> next = NULL;
start = new_node;
}
else
{
ptr = start;
while(ptr -> next != NULL)
ptr = ptr -> next;
new_node = (struct node *)malloc(sizeof(struct node));
new_node -> num = n;
new_node -> coeff = c;
new_node -> next = NULL;
ptr -> next = new_node;
}
return start;
}
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#include <stdio.h>
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C language is one of the most popular general-purpose programming language developed by Dennis Ritchie at Bell laboratories for UNIX operating system. The initial release of C Language was in the year 1972. Most of the desktop operating systems are written in C Language.
When ever you want to perform a set of operations based on a condition if-else is used.
if(conditional-expression) {
// code
} else {
// code
}
You can also use if-else for nested Ifs and if-else-if ladder when multiple conditions are to be performed on a single variable.
Switch is an alternative to if-else-if ladder.
switch(conditional-expression) {
case value1:
// code
break; // optional
case value2:
// code
break; // optional
...
default:
// code to be executed when all the above cases are not matched;
}
For loop is used to iterate a set of statements based on a condition.
for(Initialization; Condition; Increment/decrement){
// code
}
While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.
while(condition) {
// code
}
Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.
do {
// code
} while (condition);
Array is a collection of similar data which is stored in continuous memory addresses. Array values can be fetched using index. Index starts from 0 to size-1.
data-type array-name[size];
data-type array-name[size][size];
Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity.
Two types of functions are present in C
Library functions are the in-built functions which are declared in header files like printf(),scanf(),puts(),gets() etc.,
User defined functions are the ones which are written by the programmer based on the requirement.
return_type function_name(parameters);
function_name (parameters)
return_type function_name(parameters) {
//code
}