linklist problem

[dynamo]

this is a basic linklist,there seems to be a runtime error when i run the program(the main function) i suspect it has something to do with my del function
but i see nothing wrong can you help.Thanx

#include <iostream>
#include <iostream>  
#include <string>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <fstream>
using namespace std;
class linklist
{
     private:

             struct node
         {
              char data;
              int line;
            node *link;
         }*p;

   public:

             linklist();
         void append( char num ,int line);
         void add_as_first( char num,int line );
         void addafter( int c, char num,int line );
         void del( char num );
         void display();
         char charat(int x);
         int lineat(int x);
         int count();
         ~linklist();
};

linklist::linklist()
{
     p=NULL;
}

void linklist::append(char num,int line)
{
     node *q,*t;

   if( p == NULL )
   {
        p = new node;
      p->data = num;
      p->line=line;
      p->link = NULL;
   }
   else
   {
        q = p;
      while( q->link != NULL )
           q = q->link;

      t = new node;
      t->data = num;
      t->line=line;
      t->link = NULL;
      q->link = t;
   }
}

void linklist::add_as_first(char num,int line)
{
     node *q;

   q = new node;
   q->data = num;
   q->line=line;
   q->link = p;
   p = q;
}

void linklist::addafter( int c, char num,int line)
{
     node *q,*t;
   int i;
   for(i=0,q=p;i<c;i++)
   {
        q = q->link;
      if( q == NULL )
      {
           cout<<"\nThere are less than "<<c<<" elements.";
         return;
      }
   }

   t = new node;
   t->data = num;
   t->line=line;
   t->link = q->link;
   q->link = t;
}

void linklist::del( char num )
{
     node *q,*r;
   q = p;
   if( q->data == num )
   {
        p = q->link;
      delete q;
      return;
   }

   r = q;
   while( q!=NULL )
   {
        if( q->data == num )
      {
           r->link = q->link;
         delete q;
         return;
      }

      r = q;
      q = q->link;
   }
   cout<<"\nElement "<<num<<" not Found.";
}

void linklist::display()
{
     node *q;
   cout<<endl;

   for( q = p ; q != NULL ; q = q->link )
        cout<<endl<<q->data<<'\n'<<q->line;

}
int linklist::lineat(int x){
    node *q;
    int num;
    q=p;
    for(int i=0;i<=x;i++){
                  num=q->line;
                  q=q->link; 
                  }
                  return num;
                  }
char linklist::charat(int x){
    node *q;
    char num;
    q=p;
    for(int i=0;i<=x;i++){
                  num=q->data;
                  q=q->link; 
                  }
                  return num;
                  }
int linklist::count()
{
     node *q;
   int c=0;
   for( q=p ; q != NULL ; q = q->link )
        c++;

   return c;
}

linklist::~linklist()
{
     node *q;
   if( p == NULL )
        return;

   while( p != NULL )
   {
        q = p->link;
      delete p;
      p = q;
   }
}
int main(){
    int x;
    linklist l;
    l.append('1',1);
    l.append('2',2);
    l.append('5',10);
    l.del('2');
    l.display();
    cout<<l.lineat(2);
    cin>>x;
}

[weaknessforcats]

The loop in linklist::linea t is running to i<=x when it shoudl run to i<x.

The crash is not in your destructor but in linklist::linea t.

A simple debugger session would have found this.

[dynamo]

thanx man.Really appreciate it.