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Searching And Sorting #136

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d5a678d
Searching And Sorting
Kratika2314 Oct 19, 2022
6e96657
All primitive operations on Linked List
Kratika2314 Oct 19, 2022
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295 changes: 295 additions & 0 deletions All Operations On Linked List.c
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Original file line number Diff line number Diff line change
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#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <malloc.h>
struct node
{
int data;
struct node *next;
};
struct node *start = NULL;
struct node *create_ll(struct node *);
struct node *display(struct node *);
struct node *insert_beg(struct node *);
struct node *insert_end(struct node *);
struct node *insert_before(struct node *);
struct node *insert_after(struct node *);
struct node *delete_beg(struct node *);
struct node *delete_end(struct node *);
struct node *delete_node(struct node *);
struct node *delete_after(struct node *);
struct node *delete_list(struct node *);
struct node *sort_list(struct node *);
int main(int argc, char *argv[])
{
int option;
do
{
printf("\n\n *****MAIN MENU *****");
printf("\n 1: Create a list");
printf("\n 2: Display the list");
printf("\n 3: Add a node at the beginning");
printf("\n 4: Add a node at the end");
printf("\n 5: Add a node before a given node");
printf("\n 6: Add a node after a given node");
printf("\n 7: Delete a node from the beginning");
printf("\n 8: Delete a node from the end");
printf("\n 9: Delete a given node");
printf("\n 10: Delete a node after a given node");
printf("\n 11: Delete the entire list");
printf("\n 12: Sort the list");
printf("\n 13: EXIT");
printf("\n\n Enter your option : ");
scanf("%d", &option);
switch(option)
{
case 1: start = create_ll(start);
printf("\n LINKED LIST CREATED");
break;
case 2: start = display(start);
break;
case 3: start = insert_beg(start);
break;
case 4: start = insert_end(start);
break;
case 5: start = insert_before(start);
break;
case 6: start = insert_after(start);
break;
case 7: start = delete_beg(start);
break;
case 8: start = delete_end(start);
break;
case 9: start = delete_node(start);
break;
case 10: start = delete_after(start);
break;
case 11: start = delete_list(start);
printf("\n LINKED LIST DELETED");
break;
case 12: start = sort_list(start);
break;
}
}while(option !=13);
getch();
return 0;
} // END OF main()
struct node *create_ll(struct node *start)
{
struct node *new_node, *ptr;
int num;
printf("\n Enter -1 to end");
printf("\n Enter the data : ");
scanf("%d", &num);
while(num!=-1)
{
new_node = (struct node*)malloc(sizeof(struct node));
new_node -> data=num;
if(start==NULL)
{
new_node -> next = NULL;
start = new_node;
}
else
{
ptr=start;
while(ptr->next!=NULL)
ptr=ptr->next;
ptr->next = new_node;
new_node->next=NULL;
}
printf("\n Enter the data : ");
scanf("%d", &num);
}
return start;
}

struct node *display(struct node *start)
{
struct node *ptr;
ptr = start;
while(ptr != NULL)
{
printf("\t %d", ptr -> data);
ptr = ptr -> next;
}
return start;
}

struct node *insert_beg(struct node *start)
{
struct node *new_node;
int num;
printf("\n Enter the data : ");
scanf("%d", &num);
new_node = (struct node *)malloc(sizeof(struct node));
new_node -> data = num;
new_node -> next = start;
start = new_node;
return start;
}

struct node *insert_end(struct node *start)
{
struct node *ptr, *new_node;
int num;
printf("\n Enter the data : ");
scanf("%d", &num);
new_node = (struct node *)malloc(sizeof(struct node));
new_node -> data = num;
new_node -> next = NULL;
ptr = start;
while(ptr -> next != NULL)
ptr = ptr -> next;
ptr -> next = new_node;
return start;
}

struct node *insert_before(struct node *start)
{
struct node *new_node, *ptr, *preptr;
int num, val;
printf("\n Enter the data : ");
scanf("%d", &num);
printf("\n Enter the value before which the data has to be inserted : ");
scanf("%d", &val);
new_node = (struct node *)malloc(sizeof(struct node));
new_node -> data = num;
ptr = start;
while(ptr -> data != val)
{
preptr = ptr;
ptr = ptr -> next;
}
preptr -> next = new_node;
new_node -> next = ptr;
return start;
}

struct node *insert_after(struct node *start)
{
struct node *new_node, *ptr, *preptr;
int num, val;
printf("\n Enter the data : ");
scanf("%d", &num);
printf("\n Enter the value after which the data has to be inserted : ");
scanf("%d", &val);
new_node = (struct node *)malloc(sizeof(struct node));
new_node -> data = num;
ptr = start;
preptr = ptr;
while(preptr -> data != val)
{
preptr = ptr;
ptr = ptr -> next;
}
preptr -> next=new_node;
new_node -> next = ptr;
return start;
}

struct node *delete_beg(struct node *start)
{
struct node *ptr;
ptr = start;
start = start -> next;
free(ptr);
return start;
}

struct node *delete_end(struct node *start)
{
struct node *ptr, *preptr;
ptr = start;
while(ptr -> next != NULL)
{
preptr = ptr;
ptr = ptr -> next;
}
preptr -> next = NULL;
free(ptr);
return start;
}

struct node *delete_node(struct node *start)
{
struct node *ptr, *preptr;
int val;
printf("\n Enter the value of the node which has to be deleted : ");
scanf("%d", &val);
ptr = start;
if(ptr -> data == val)
{
start = delete_beg(start);
return start;
}
else
{
while(ptr -> data != val)
{
preptr = ptr;
ptr = ptr -> next;
}
preptr -> next = ptr -> next;
free(ptr);
return start;
}
}

struct node *delete_after(struct node *start)
{
struct node *ptr, *preptr;
int val;
printf("\n Enter the value after which the node has to deleted : ");
scanf("%d", &val);
ptr = start;
preptr = ptr;
while(preptr -> data != val)
{
preptr = ptr;
ptr = ptr -> next;
}
preptr -> next=ptr -> next;
free(ptr);
return start;
}

struct node *delete_list(struct node *start)
{
struct node *ptr; // Lines 252-254 were modified from original code to fix
//unresposiveness in output window
if(start!=NULL)
{
ptr=start;
while(ptr != NULL)
{
printf("\n %d is to be deleted next", ptr -> data);
start = delete_beg(ptr);
ptr = start;
}
}
return start;
}

struct node *sort_list(struct node *start)
{
struct node *ptr1, *ptr2;
int temp;
ptr1 = start;
while(ptr1 -> next != NULL)
{
ptr2 = ptr1 -> next;
while(ptr2 != NULL)
{
if(ptr1 -> data > ptr2 -> data)
{
temp = ptr1 -> data;
ptr1 -> data = ptr2 -> data;
ptr2 -> data = temp;
}
ptr2 = ptr2 -> next;
}
ptr1 = ptr1 -> next;
}
return start; // Had to be added
}
88 changes: 88 additions & 0 deletions Searching And Sorting.c
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#include <stdio.h>

// A function to implement bubble sort
void swap(int* xp, int* yp)
{
int temp = *xp;
*xp = *yp;
*yp = temp;
}
void printArray(int arr[], int size)
{
int i;
for (i = 0; i < size; i++)
printf("%d ", arr[i]);
printf("\n");
}
void bubbleSort(int arr[], int n)
{
int i, j;
for (i = 0; i < n - 1; i++)

// Last i elements are already in place
for (j = 0; j < n - i - 1; j++)
if (arr[j] > arr[j + 1])
swap(&arr[j], &arr[j + 1]);
}

// C function to implement recursive Binary Search
int binarySearch(int arr[], int l, int r, int x)
{
if (r >= l) {
int mid = l + (r - l) / 2;

// If the element is present at the middle
// itself
if (arr[mid] == x)
return mid;

// If element is smaller than mid, then
// it can only be present in left subarray
if (arr[mid] > x)
return binarySearch(arr, l, mid - 1, x);

// Else the element can only be present
// in right subarray
return binarySearch(arr, mid + 1, r, x);
}

// We reach here when element is not
// present in array
return -1;
}

// Driver program to test above functions
int main()
{
int ch;
printf("Press 1: To sort an array\n");
printf("Press 2: To search an element in array\n");
printf("Enter your choice\n");
scanf("%d",&ch);
printf("Enter the size of array\n");
int n,i,x=0,result=0;
scanf("%d",&n);
printf("Enter the elements in array\n");
int arr[n];
for(i=0;i<n;i++)
{
scanf("%d",&arr[i]);
}
switch(ch)
{
case 1:
bubbleSort(arr, n);
printf("Sorted array: \n");
printArray(arr, n);
return 0;
break;
case 2:
printf("Enter the element to be searched\n");
scanf("%d",&x);
result=binarySearch(arr,0,n-1,x);
(result == -1)? printf("Element is not present in array\n"): printf("Element is present at index %d\n", result);
break;
default:
printf("Wrong choice\n");
}
}