PullMonkey Blog

14 Apr

ECE231 – Spring 2009 – Programming Assignment 4


This is a step-by-step tutorial for this assignment and an explanation of the basics of how it works for those that are having a difficult time understanding or just are stuck somewhere. To view the assignment click here.

So for this assignment we are only going to be doing input and output. So the only header file we need is the iostream library.

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#include <iostream>
using namespace std;

Defining the Node Class

For the node class we need 5 private variables: type, value, node1, node2, next, a constructor, 5 member functions, and a friend class.

Because most of the functions only return a single variable it would be a waste to have the functions outside the class so I put them all inside the class.

So here is what your class should look like:

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class node
{
  protected:
    int type;     // type of component
    double value; // value of the component
    int node1;    // first node of the component
    int node2;    // second node of the component
    node *next;   // pointer to the next node in list
  public:
    node(int a, double b, int c, int d)
    {
      type  = a;
      value = b;
      node1 = c;
      node2 = d;
    }

    int getType() { return type; }
    double getValue() { return value; }
    int getNode1() { return node1; }
    int getNode2() { return node2; }
    node *getNext() { return next; }

    friend class circuit;
};

Defining the Circuit Class

For the circuit class we need 2 private variables: first and last, a constructor, a copy constructor, 6 member functions, and a friend function.

For these I will put most of the functions on the outside of the class.

So here is what your class should look like:

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class circuit
{
  protected:
    node *first; // pointer to first node in list
    node *last;  // pointer to last node in list
    node *getNode(int & , double & , int & , int & );
  public:
    circuit();
    circuit(const circuit & );
    ~circuit();

    void insert(int , double , int , int );
    void insertInFront(node * );
    void insertInBack(node * , node * );
    void insertInMiddle(node * , node * , node * );
    bool remove(int , int );
    bool isEmpty();

    friend ostream & operator << (ostream & , circuit );
};

Writing the Actual Functions for the Circuit Class

First, we have the private function getNode. This function creates a new member of the node class and returns the address to it.

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node* circuit::getNode(int &t, double &v, int &n1, int &n2)
{
  node *temp = new node(t, v, n1, n2);
  assert( temp != 0 );
  return temp;
}

Second, we have the a constructor, a copy constructor, and a class destructor:

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circuit::circuit()
{
  first = last = 0;
}
circuit::circuit(const circuit &c)
{
  first = last = 0;
  node *nc = c.first;
  while(nc != 0)
  {
    insert(nc->type, nc->value, nc->node1, nc->node2);
    nc = nc->next;
  }
}
circuit::~circuit()
{
  if( !isEmpty() )
  {
    node *nc = first;
    node *temp;
    while(nc != 0)
    {
      temp = nc;
      nc = nc->next;
      delete temp;
    }
  }
}

Next, we have the 6 member functions:

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void circuit::insert(int t, double v, int n1, int n2)
{
  node *newNode = getNode(t, v, n1, n2);
  node *nc = first;
  node *nc_next = first;
  if(isEmpty())
  {
    first = last = newNode;
    newNode->next = 0;
  }
  else if(first == last)
  {
    if(newNode->node1 < first->node1)
      insertInFront(newNode);
    else if(newNode->node1 > first->node1)
      insertInBack(newNode, first);
    else // if newNode->node1 == first->node1
    {
      if(newNode->node2 < first->node2)
        insertInFront(newNode);
      else
        insertInBack(newNode, first);
    }
  }
  else
  {
    while(nc->next != 0)
    {
      if(newNode->node1 < nc_next->node1)
      {
        if(nc_next == first)
          insertInFront(newNode);
        else
          insertInMiddle(newNode, nc, nc_next);
        break;
      }
      if(newNode->node1 == nc_next->node1)
      {
        if(newNode->node2 <= nc_next->node2)
        {
          if(nc_next == first)
            insertInFront(newNode);
          else
            insertInMiddle(newNode, nc, nc_next);
          break;
        }
      }
      if(newNode->node1 >= nc_next->node1 and nc_next == last)
      {
        insertInBack(newNode, nc_next);
        break;
      }
      nc = nc_next;
      nc_next = nc->next;
    }
  }
}
void circuit::insertInFront(node *n)
{
  n->next = first;
  first = n;
}
void circuit::insertInBack(node *n, node *p)
{
  p->next = last = n;
  n->next = 0;
}
void circuit::insertInMiddle(node *cn, node *p , node *n)
{
  p->next = cn;
  cn->next = n;
}
bool circuit::remove(int n1, int n2)
{
  node *nc = first;
  node *nc_next = first;
  node *temp;
  if( isEmpty() )
    return false;
  while (nc_next != 0)
  {
    if(nc_next != 0 and nc_next->node1 == n1 and nc_next->node2 == n2)
    {
      temp = nc_next;
      nc->next = nc_next->next;
      if(first == last)
        first = last = 0;
      if(nc_next == first)
        first = temp->next;
      if (nc_next == last)
        last = nc;
      delete nc_next;
      return true;
    }
    nc = nc_next;
    nc_next = nc->next;
  }
  return false;
}
bool circuit::isEmpty()
{
  return ( first == 0 and last == 0 );
}

Last, we have a friend function:

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ostream & operator << (ostream &os, circuit c)
{
  node *nc = c.first; // node count variable used for looping through list
  int lcv = 1; // loop control variable
  cout << "First: " << c.first << "  Last: " << c.last << endl;
  while (nc != 0)
  {
    os << lcv << ". "
       << "node1: "   << nc->getNode1() 
       << "  node2: " << nc->getNode2()
       << "  type: "  << nc->getType() 
       << "  value: " << nc->getValue() 
       << "  next: "  << nc->getNext() 
       << endl;
    nc = nc->getNext();
    lcv++;
  }
  if(c.first == 0)
    os << "List is empty" << endl;
  return os;
}

Testing your program

Our teacher gave us a test program, however I expanded it a little bit to test a bit more fully.

So here is my test program:

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#include <iostream>
#include "yourprogramname.h"
using namespace std;

const int M=7;
const int R=2;

int main()
{
  circuit c, c2, c3;
  int d[M*3] = {1,1,4, 1,1,3, 2,2,3, 1,1,2, 1,5,6, 1,2,5, 3,1,3};
  double v[M] = {10.5, 30.7, 100.4, 20.6, 35.5, 45.9, 60.8};
  int d1[R*8] = {1,2, 5,6, 3,6, 1,4, 1,3, 2,5, 2,3, 1,3};
  int i, j;

  for( i=0,j=0; i<M; i++,j=j+3 )
  {
    cout << i+1 << endl;
    cout << "Inserting new node into list with:" << endl;
    cout << "node1: "   << d[j+1]
         << "  node2: " << d[j+2]
         << "  type: "  << d[j]
         << "  value: " << v[i]
         << endl;
    c.insert( d[j], v[i], d[j+1], d[j+2] );
    cout << "List: " << endl;
    cout << c << endl << endl;
  }
  for( i=0; i<R*8; i=i+2 )
  {
    cout << "Removing node with:" << endl;
    cout << "node1: "   << d1[i]
         << "  node2: " << d1[i+1]
         << endl;
    if( c.remove( d1[i], d1[i+1] ) == false )
      cout << "Node not found" << endl;
    cout << "List: " << endl;
    cout << c << endl << endl;
  }

  cout << "nnMaking List #2:" << endl;
  int d2[M*3] = {2,2,4, 1,1,3, 2,2,3, 1,1,2, 1,5,6, 1,2,5, 3,1,3};
  for( i=0,j=0; i<M; i++,j=j+3 )
  {
    cout << i+1 << endl;
    cout << "Inserting new node into list with:" << endl;
    cout << "node1: "   << d2[j+1]
         << "  node2: " << d2[j+2]
         << "  type: "  << d2[j]
         << "  value: " << v[i]
         << endl;
    c2.insert( d2[j], v[i], d2[j+1], d2[j+2] );
    cout << "List: " << endl;
    cout << c2 << endl << endl;
  }

  cout << "nnMaking List #3:" << endl;
  int d3[M*3] = {2,2,4, 3,3,3, 2,2,3, 1,1,2, 1,5,6, 1,2,5, 3,1,3};
  for( i=0,j=0; i<M; i++,j=j+3 )
  {
    cout << i+1 << endl;
    cout << "Inserting new node into list with:" << endl;
    cout << "node1: "   << d3[j+1]
         << "  node2: " << d3[j+2]
         << "  type: "  << d3[j]
         << "  value: " << v[i]
         << endl;
    c3.insert( d3[j], v[i], d3[j+1], d3[j+2] );
    cout << "List: " << endl;
    cout << c3 << endl << endl;
  }

  return 0;
}

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