Help with this Link list

[nasnoma]

I want someone to help me write a program to read the integer elements of two arrays A and B of different size from the user. And use link list to save this elements instead of arrays. And then do the following to the link lists given:

1. Sort link list A in ascending order using a special sorting function by passing a pointer to the function.
2. Sort link list B in descending order using a special sorting function by passing a pointer to the function.
3. Add an element with a value of 001 at the end of the first link list A
4. Add an element with a value of 002 at the beginning of second link
5. Join both link lists as A and B in one link list
6. add one element in the middle of the new link list with a value of 003
7. add all the elements in the link list
8. print the values of all elements and their sum on the screen

[Alex Edwards]

Show us what you've come up with on your own.

We help you, we don't code for you @_@

Try to solve your problem with list and algorithms of the STL

[nasnoma]

#include <iostream.h>
#include<stdlib.h>

struct node
  { 
     int number;          // data
     node *nxt;// Pointer to next node
  };

node *start_ptr = NULL;
node *start_ptr2=NULL;
node *start_ptr3=NULL;
node *current;		 // Used to move along the list
node *current2;
int option = 0,i;

void add_node_at_end(int what,int val)
  {  node *temp, *temp2;   // Temporary pointers

     // Reserve space for new node and fill it with data
     temp = new node;
	 if(what!=3){ 
		
	 cout << "Please enter the value into list "<<what<<" :";
     cin >> temp->number;
	 }
	 else if(what==3){temp->number=val;}
     temp->nxt = NULL;

	 if(what==1){//list 1
     // Set up link to this node
     if (start_ptr == NULL)
       { start_ptr = temp;
	 current = start_ptr;
       }
     else
       { temp2 = start_ptr;
         // We know this is not NULL - list not empty!
         while (temp2->nxt != NULL)
           {  temp2 = temp2->nxt;
              // Move to next link in chain
           }
         temp2->nxt = temp;
       }
	 }
	 else if(what==2){//list 2
		 // Set up link to this node
     if (start_ptr2 == NULL)
       { start_ptr2 = temp;
	 current2 = start_ptr2;
       }
     else
       { temp2 = start_ptr2;
         // We know this is not NULL - list not empty!
         while (temp2->nxt != NULL)
           {  temp2 = temp2->nxt;
              // Move to next link in chain
           }
         temp2->nxt = temp;
       }
	 }

	 else if(what==3){//list 3
		 // Set up link to this node
     if (start_ptr3 == NULL)
       { start_ptr3 = temp;
	 current2 = start_ptr3;
       }
     else
       { temp2 = start_ptr3;
         // We know this is not NULL - list not empty!
         while (temp2->nxt != NULL)
           {  temp2 = temp2->nxt;
              // Move to next link in chain
           }
         temp2->nxt = temp;
       }
	 }
  }

void display_list(int what)
  {  node *temp;
system("cls");
if(what==1){  temp = start_ptr;}
else if(what ==2){temp=start_ptr2;}
else if(what==3){temp=start_ptr3;}
     cout << endl;
     if (temp == NULL)
       cout << "The list is empty!" << endl;
     else
       { while (temp != NULL)
	   {  // Display details for what temp points to
             
              cout << "Num : " << temp->number << " ";
	      
	      if (temp == current)
		
            
	      temp = temp->nxt;

	   }
	 cout << "End of list!" << endl;
       }
  }


void selection_sort()
{
 node *p, *q, *r, *s, *temp ;
p = r = start_ptr ;
 
while ( p -> nxt != NULL )
{
s = q = p -> nxt ;
while ( q != NULL )
{
if ( p -> number > q -> number )
{
if ( p -> nxt == q ) /* Adjacent Nodes */
{
if ( p == start_ptr )
{
p -> nxt = q -> nxt ;
q -> nxt = p ;
temp = p ;
p = q ;
q = temp ;
 
start_ptr = p ;
r = p ;
s = q ;
q = q -> nxt ;
}
else
{
p -> nxt = q -> nxt ;
q -> nxt = p ;
r -> nxt = q ;
temp = p ;
p = q ;
q = temp ;
s = q ;
q = q -> nxt ;
}
}
else
{
if ( p == start_ptr )
{
temp = q ->nxt ;
q -> nxt = p -> nxt ;
p -> nxt = temp ;
s ->nxt = p ;
temp = p ;
p = q ;
q = temp ;
s = q ;
q = q -> nxt ;
start_ptr = p ;
}
else
{
temp = q -> nxt ;
q -> nxt = p -> nxt ;
p -> nxt = temp ;
r -> nxt = q ;
s -> nxt = p ;
temp = p ;
p = q ;
q = temp ;
s = q ;
q = q -> nxt ;
}
}
}
else
{
s = q ;
q = q -> nxt ;
}

}
r = p ;
p = p -> nxt ;


}
 

}

void delete_start_node()
   { node *temp;
     temp = start_ptr;
     start_ptr = start_ptr->nxt;
     delete temp;
   }

void delete_end_node()
   { node *temp1, *temp2;
     if (start_ptr == NULL)
          cout << "The list is empty!" << endl;
     else
        { temp1 = start_ptr;
          if (temp1->nxt == NULL)
             { delete temp1;
               start_ptr = NULL;
             }
          else
             { while (temp1->nxt != NULL)
                { temp2 = temp1;
                  temp1 = temp1->nxt;
                }
               delete temp1;
               temp2->nxt = NULL;
             }
        }
   }

void move_current_on ()
   { if (current->nxt == NULL)
      cout << "You are at the end of the list." << endl;
     else
      current = current->nxt;
   }

void move_current_back (int what)
   { 
	if(what==1){
	if (current == start_ptr)
      cout << "You are at the start of the list" << endl;
     else
      { node *previous;     // Declare the pointer
        previous = start_ptr;

        while (previous->nxt != current)
          { previous = previous->nxt;
          }
        current = previous;
      }
	}
	else if(what ==2){
	
		if (current == start_ptr2)
      cout << "You are at the start of the list" << endl;
     else
      { node *previous;     // Declare the pointer
        previous = start_ptr2;

        while (previous->nxt != current)
          { previous = previous->nxt;
          }
        current = previous;
      }
	}
   }

void addDataToLists(){

	for(int i=0;i<=2;i++){
		add_node_at_end(1,0);
	}

	for( i=0;i<=4;i++){
		add_node_at_end(2,0);
	}

//	display_list(1);
	cout <<endl;
//	display_list(2);
	cout <<endl;

		

}


void addElementstoNewList(){

	node *temp;
	temp = start_ptr;


	while (temp != NULL)
	   {  // Display details for what temp points to
             
              
	      
	      if (temp == current)
		
            add_node_at_end(3,temp->number);
	        temp = temp->nxt;

	   }
	
	temp=start_ptr2;
	while (temp != NULL)
	   {  // Display details for what temp points to
             
              
	      
	      if (temp == current)
		
            add_node_at_end(3,temp->number);
	        temp = temp->nxt;

	   }

display_list(3);
	
}

void main()
  {  start_ptr = NULL;
	 start_ptr2 = NULL;
	 start_ptr3 = NULL;
     addDataToLists();
     do
	{
		
	  cout << endl;
	  cout << "Please select an option : " << endl;
	  cout <<"1.Sort link list A in ascending order using a special sorting function\n  by passing a pointer to the function.\n\n"
		   <<"2.Sort link list B in descending order using a special sorting function\n  by passing a pointer to the function.\n\n"
	       <<"3.Add an element with a value of 001 at the end of the first link list A.\n\n"
           <<"4.Add an element with a value of 002 at the beginning of second link.\n\n"
           <<"5.Join both link lists as A and B in one link list.\n\n"
           <<"6.Add one element in the middle of the new link list with a value of 003.\n\n"
           <<"7.Add all the elements in the link list.\n\n"
           <<"8.Print the values of all elements and their sum on the screen.\n\n"
		   <<"0.EXIT"<<endl<<endl;

          cout << endl << " >> ";
	  cin >> option;

	  switch (option)
	    {
	      case 1 ://selection_sort( );
				  //display_list(1);
			  break;
	      case 2 : //delete_start_node();
			  break;
	      case 3 :
				add_node_at_end(1,0);
			  	display_list(1);
				cout <<endl;
			  break;
	      case 4 :
			  for(i=0;i<5;i++){
				  move_current_back (2);}
					add_node_at_end(2,0);

			  break;
          case 5 :addElementstoNewList();
			  break;
	      case 6 : //add_node_at_end();
			  break;
	      case 7 :// delete_start_node(); 
			  break;
	      case 8 :// delete_end_node();
			  break;
		  case 0 : exit(0);
	    }
	}
     while (option != 0);
  }

This is what i have come up with .Pls help me with sorting part

[Ancient Dragon]

>>1. Sort link list A in ascending order using a special sorting function by passing a pointer to the function.

Your selection_sort function does not mee that requirement. Is selection sort algorithm required? or can you use any sort algorithm you want? And where is the parameter ?