Thread: Linklist Update

*Sometimes* you will have problems incrementing a parameterized pointer, as if it were const...remote, but possible. Try:

Code:

#include <iostream>
#include <conio>
using namespace std;

struct node{
	int data;
	node *next;
};


void add_node(node *list, int num);
void output_list(node *list);
void delete_head(node *list);


int main(){
	node *list = NULL;

	add_node(list, 3);
	add_node(list, 22);
	add_node(list, 4);
	output_list(list);
	delete_head(list);
	output_list(list);
                delete_list(list);
	return 0;
}


void add_node(node *list, int num){           
 node *iter = list, 
       *temp = new node;
	
 temp -> data = num;
 temp -> next = NULL;         
	
  if(list == NULL){
   list = temp;
   return;
   }
  
  while (iter -> next != NULL)
     iter = iter -> next;
	
 iter -> next = temp;
} //end void add_node


void output_list(node *list){
 node *temp = list;
 int i = 0;
 
 while (temp != NULL){
  cout << "Node " << ++i << " contains data value " << temp ->    data << endl;
 temp = temp -> next;
 }
 
 cout << i << "nodes total." << endl;

} //end void output_list

void delete_head(node * list){
  if(list == NULL) return;
  node * goner = list;
  list = list->next;
  delete goner;
 }


/* edit*///...function added 

void delete_list(node *list){
 node *current, *next; 
  next = current = list;
    
  while(next){
    next = current->next;
    delete current;
    current = next;
    }

} //end void delete_list