Why am I getting a Segmentation Fault 11?? If I only insert one node it successfully prints. But once I add a second, it fails to print

Sample Input:

"insertEnd hello"

InsertEndBegin

hello

Insert

"insertEnd there"

InsertEndBegin

there

Insert

InsertEndNode

Insert End done

"print"

Segmentation fault: 11

Code:

#include

#include

#include

using namespace std;

class Node{

public:

string line;

Node *next;

};

Node *head = NULL;

void insertNode(string instring, int pos){

//bounds check

cout<< "Insert" << endl;

/* Node *node = new Node;

node->line = instring;

node->next = NULL;

Node *temp = head;

*/

Node *addNode = new Node;

addNode->line = instring;

if(head==NULL){

head=addNode;

}

else{

if(pos==-1){

cout <<"InsertEndNode" <

Node *last = head;

while(last->next !=NULL ) last=last->next;

last->next = addNode;

cout <<"Insert End done"<< endl;

}

else if(pos==0){

node->next = temp;

head = node;

}

}

}

//trying to get this part working, replaces previous else loop

/*

else{

if(pos==-1){

while(temp->next!=NULL){

temp = temp->next;

}

temp->next = node;

temp->line = instring;

cout << "InsertEnd" << endl;

}

else if(pos==0){

node->next = temp;

head = node;

}

else{

int i=0;

while(i

temp = temp->next;

}

node->next = temp->next;

temp->next = node;

}

}

cout << "InsertEndDone" << endl;

*/

void deleteNode(int pos){

Node *temp = head;

Node *prev = NULL;

if(pos==0){

head = head->next;

}

else{

int i = 0;

while(i

prev = temp;

temp = temp->next;

i++;

}

prev->next=temp->next;

}

}

void editNode(int pos, string instring){

Node *temp = head;

if(pos==1){

head->line = instring;

}

else{

while(pos){

temp = temp->next;

pos--;

}

temp->line = instring;

}

}

void printList(){

Node *temp = head;

if(temp ==NULL){

cout<<"The Document is Empty"<

return;

}

int linenum = 1;

while(temp!=NULL){

cout << linenum <<" "<< temp->line <

temp=temp->next;

linenum++;

}

}

vector split(string inputstring){

vector vec;

string s = "";

int state = 0;

for(int i; i

switch(state){

case 0:

if(inputstring[i]==' '){

vec.push_back(s);

s = "";

}

else if(inputstring[i]=='"'){

state = 1;

}

else{

s+=inputstring[i];

}

break;

case 1:

if(inputstring[i]=='"'){

state = 0;

vec.push_back(s);

s = "";

}

else{

s+=inputstring[i];

}

}

//cout<

}

if(s.length()>0){

vec.push_back(s);

}

return vec;

}

int main() {

head=NULL;

string input;

do{

getline(cin, input);

if(input=="quit"){

break;

}

vector vec = split(input);

if(vec[0]=="insertEnd"){

cout << "InsertEndBegin" <

cout << vec[1] << endl;

insertNode(vec[1], -1);

}

else if(vec[0]=="print"){

printList();

}

else if(vec[0]=="delete"){

deleteNode(stoi(vec[1]));

}

else if(vec[0]=="edit"){

editNode(stoi(vec[1]),vec[2]);

}

else if(vec[0]=="insert"){

cout << "InsertPosBegin" << endl;

insertNode(vec[2],stoi(vec[1]));

}

}while(true);

return 0;

}