Created
November 17, 2013 20:20
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LinkedList implementation in C.
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#include <stdio.h> | |
#include <stdlib.h> | |
// Define node struct type | |
struct node | |
{ | |
int data; | |
struct node *next; | |
}; | |
typedef struct node Node; | |
int length(struct node*head) | |
{ | |
int count = 0; | |
struct node*current = head; | |
while(current != NULL) | |
{ | |
count++; | |
current = current -> next; | |
} | |
return count; | |
} | |
int getNth(struct node*head, int key) | |
{ | |
int positionCount = 0; | |
struct node*current = head; | |
while(current != NULL) | |
{ | |
if(positionCount == key) { | |
return(current->data); | |
} | |
positionCount++; | |
current = current->next; | |
} | |
return(0); | |
} | |
Node insertNth(struct node*head, int position, int insertData) | |
{ | |
int count = 0; | |
struct node*current = head; | |
struct node*replacement; | |
replacement = (Node *)malloc(sizeof(Node)); | |
struct node*temp = NULL; | |
while(current != NULL) | |
{ | |
if(position == 0) { | |
replacement->next = head; | |
replacement->data = insertData; | |
head = replacement; | |
return *replacement; | |
} | |
if(count + 1 == position) { | |
temp = current->next; | |
printf("Temp data is: %d\n", temp->data); | |
current->next = replacement; | |
replacement->next = temp; | |
replacement->data = insertData; | |
return *replacement; | |
} | |
current = current->next; | |
count++; | |
} | |
} | |
/* | |
void sortedInsert(struct node*head, struct node*newNode ) | |
{ | |
struct node*current1 = head; | |
struct node*current2 = (Node *)malloc(sizeof(Node)); | |
while(current1 != NULL) { | |
current2 = current1->next; | |
if(current2 == NULL) { | |
current1->next = newNode; | |
newNode-> | |
} | |
if(newNode->data >= current1->data && newNode->data <= current2->data) { | |
current1->next = newNode; | |
newNode->next = current2; | |
} | |
} | |
} | |
*/ | |
void deleteList(struct node*head) | |
{ | |
struct node*current1; | |
struct node*current2; | |
current1 = head; | |
while(current1 != NULL) { | |
current2 = current1; | |
current1 = current1->next; | |
free(current2); | |
} f | |
ree(current1); | |
} | |
Node pop(struct node*head) | |
{ | |
struct node*current; | |
current = head; | |
head = head->next; | |
free(current); | |
return *head; | |
} | |
/* ------------------------- | |
main() - Initializes linkedlist with 214 links | |
------------------------- */ | |
int main() | |
{ | |
Node *current1, *current2, *head, *tail; | |
tail = NULL; | |
//create new space for currents | |
current2 = (Node *)malloc(sizeof(Node)); | |
int i; | |
for(i = 1; i < 215; i++) { | |
current1 = current2; | |
// Assign value to data | |
current1->data = i; | |
current2 = (Node *)malloc(sizeof(Node)); | |
// Point to last memory spot or if current first spot, points to null | |
current1->next = current2; | |
// Going to look like: head(1) -> 2 -> 3 -> 4 -> 5 ... -> 214 -> tail(NULL) | |
if(i == 1){ | |
// head is start of list | |
head = current1; | |
} | |
else if(i == 214) { | |
tail = current2; | |
} | |
} | |
// Inserts new link into linked list | |
// insertNth(node*head, int position, int insertData) | |
insertNth(head, 113, 93); | |
// returns value at a position in linked list else returns 0 | |
// getNth(struct node*head, int key) | |
int positionValue = getNth(head, 13); | |
/* | |
while(current1 != NULL) { | |
printf("Current data while looping through linkedlist : %d\n", current1-> data); | |
current1 = current1->next; | |
} | |
printf("length of list: %d\n", length(head));*/ | |
return 0; | |
} |
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you decided to typedeg struct node ->Node, but didn't use it....