Program to sort a linked list by swapping data.

Program to sort a linked list by swapping data.

Code for Program to sort a linked list by swapping data in C Programming

#include <stdio.h>
#include <conio.h>
#include <alloc.h>

/* structure containing a data part and link part */
struct node
{
    int data ;
    struct node *link ;
} *newnode, *start, *visit ;

void getdata( ) ;
void append ( struct node **, int ) ;
void displaylist( ) ;
int count ( struct node * ) ;
void selection_sort ( int ) ;
void bubble_sort ( int ) ;

void main( )
{
    int n ;

    getdata( ) ;

    clrscr( ) ;
    printf ( "Linked List Before Sorting: " ) ;
    displaylist( ) ;

    n = count ( start ) ;

    selection_sort ( n ) ;
    printf ( "\nLinked List After Selection Sorting: " ) ;
    displaylist( ) ;
    getch( ) ;

    getdata( ) ;
    clrscr( ) ;
    printf ( "Linked List Before Sorting: " ) ;
    displaylist( ) ;

    n = count ( start ) ;

    bubble_sort ( n ) ;
    printf ( "\nLinked List After Bubble Sorting: " ) ;
    displaylist( ) ;
    getch( ) ;
}

void getdata( )
{
    int val, n ;
    char ch ;
    struct node *new ;

    clrscr( ) ;

    new = NULL ;
    do
    {
        printf ( "\nEnter a value: " ) ;
        scanf ( "%d", &val ) ;

        append ( &new, val ) ;

        printf ( "\nAny More Nodes (Y/N): " ) ;
        ch = getche( ) ;
    } while ( ch == 'y' || ch == 'Y' ) ;

    start = new ;
}

/* adds a node at the end of a linked list */
void append ( struct node **q, int num )
{
    struct node *temp ;
    temp = *q ;

    if ( *q == NULL ) /* if the list is empty, create first node */

    {
        *q = malloc ( sizeof ( struct node ) ) ;
        temp = *q ;
    }
    else
    {
        /* go to last node */
while ( temp -> link != NULL )
            temp = temp -> link ;

        /* add node at the end */

        temp -> link = malloc ( sizeof ( struct node ) ) ;
        temp = temp -> link ;
    }

    /* assign data to the last node */

    temp -> data = num ;
    temp -> link = NULL ;
}

/* displays the contents of the linked list */
void displaylist( )
{
    visit = start ;

    /* traverse the entire linked list */
while ( visit != NULL )
    {
        printf ( "%d ", visit -> data ) ;
        visit = visit -> link ;
    }
}

/* counts the number of nodes present in the linked list */
int count ( struct node * q )
{
    int c = 0 ;

    /* traverse the entire linked list */
while ( q != NULL )
    {
        q = q -> link ;
        c++ ;
    }

    return c ;
}

void selection_sort ( int n )
{
    int i, j, k, temp ;
    struct node *p, *q ;

    p = start ;
    for ( i = 0 ; i < n - 1 ; i++ )
    {
        q = p -> link ;

        for ( j = i + 1 ; j < n ; j++ )
        {
            if ( p -> data > q -> data )
            {
                temp = p -> data ;
                p -> data = q -> data ;
                q -> data = temp ;
            }
            q = q -> link ;
        }
        p = p -> link ;
    }
}

void bubble_sort ( int n )
{
    int i, j, k, temp ;
    struct node *p, *q ;

    k = n ;
    for ( i = 0 ; i < n - 1 ; i++, k-- )
    {
        p = start ;
        q = p -> link ;

        for ( j = 1 ; j < k ; j++ )
        {
            if ( p -> data > q -> data )
            {
                temp = p -> data ;
                p -> data = q -> data ;
                q -> data = temp ;
            }
            p = p -> link ;
            q = q -> link ;
        }
    }
}