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swap_LL_nodes.c
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swap_LL_nodes.c
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#include<stdio.h>
#include<stdlib.h>
struct node
{
int data;
struct node* next;
};
struct node* first = NULL;
struct node* makenode(int a)
{
struct node* tmp = NULL;
tmp = malloc(sizeof(struct node));
tmp->data = a;
tmp->next = NULL;
return tmp;
}
void display()
{
if(first == NULL)
return;
struct node* tmp = first;
do
{
printf("%d ", tmp->data);
tmp = tmp->next;
}
while(tmp != NULL);
}
void swap()
{
int count = 0;
struct node* tmp = first;
if(tmp == NULL)
return;
do
{
count++;
if(count % 2 == 1)
{
if(tmp->next == NULL)
continue;
int _tmp = tmp->data;
tmp->data = tmp->next->data;
tmp->next->data = _tmp;
}
tmp = tmp->next;
}
while(tmp != NULL);
}
int main()
{
printf("HEllo\n");
first = makenode(1);
first->next = makenode(2);
first->next->next = makenode(3);
first->next->next->next = makenode(4);
first->next->next->next->next = makenode(5);
first->next->next->next->next->next = makenode(6);
printf("Before swapping\n");
display();
swap();
printf("\nAfter swapping\n");
display();
printf("\nHEllo\n");
return 0;
}