A linked list is a data structure that consists of a
sequence of data records such that in each record there
is a field that contains a reference (i.e., a link) to
the next record in the sequence.
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#include <iostream>
using namespace std;
struct node
{ char name[20]; int age; float height; node *nxt; };
node *start_ptr = NULL;
node *current;int option = 0;
void add_node_at_end()
{ node *temp, *temp2; temp = new node;
cout << "Please enter the name of the person: ";
cin >> temp->name;
cout << "Please enter the age of the person : ";
cin >> temp->age;
cout << "Please enter the height of the person : ";
cin >> temp->height;
temp->nxt = NULL; if (start_ptr == NULL)
{ start_ptr = temp;
current = start_ptr;
}
else
{ temp2 = start_ptr; while (temp2->nxt != NULL)
{ temp2 = temp2->nxt; }
temp2->nxt = temp;
}
}
void display_list()
{ node *temp;
temp = start_ptr;
cout << endl;
if (temp == NULL)
cout << "The list is empty!" << endl;
else
{ while (temp != NULL)
{ cout << "Name : " << temp->name << " ";
cout << "Age : " << temp->age << " ";
cout << "Height : " << temp->height;
if (temp == current)
cout << " <-- Current node";
cout << endl;
temp = temp->nxt;
}
cout << "End of list!" << endl;
}
}
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 ()
{ if (current == start_ptr)
cout << "You are at the start of the list" << endl;
else
{ node *previous; previous = start_ptr;
while (previous->nxt != current)
{ previous = previous->nxt;
}
current = previous;
}
}
int main()
{ start_ptr = NULL;
do
{
display_list();
cout << endl;
cout << "Please select an option : " << endl;
cout << "0. Exit the program." << endl;
cout << "1. Add a node to the end of the list." << endl;
cout << "2. Delete the start node from the list." << endl;
cout << "3. Delete the end node from the list." << endl;
cout << "4. Move the current pointer on one node." << endl;
cout << "5. Move the current pointer back one node." << endl;
cout << "6. Display the list. " << endl;
cout << endl << " >> ";
cin >> option;
switch (option)
{
case 1 : add_node_at_end(); break;
case 2 : delete_start_node(); break;
case 3 : delete_end_node(); break;
case 4 : move_current_on(); break;
case 5 : move_current_back(); break;
case 6 : display_list();
}
}
while (option != 0);
return(0);
}
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