integrating classes to a long running project

[jmsherndon]

this is a game I've been building on since i started learning c++ about a year and a half ago. id like to integrate classes into it now in the form of making the planets in a sort of map linked together such as terra novus connects to noctus and rouge, rouge goes to noctus and aquilis aquilis links to ager and noctus goes to rouge and aquilis (and back again). with a certain number of random events between (once i get this part up im going to add some random effects to the dead space such as meteor storms for damage, or a commodedety gain so on) no like between novus and noctus theres minimum of 3 events and max of like 5. im about to this point in my books but they dont make any sence to me on using classes. code follows

#include<iostream>
#include<fstream>
#include<vector>
#include<string>
#include<cstdlib>
#include<ctime>


using namespace std;
// Function Pototypes

void Charac();
void Planet();
void Fight();
void DeadSpace();
void Save();
void Load();

// global money variables
int purchace;
int bounty = 0;
int have = 0;
int money = 500;

//character stats
int cSTR = 1 ;
int cHULL = 1;
int cREF = 1;
int hp;
int turn;
int clev = 0;
int z = 10;

int endcheck;

void main()
{
	string x;
	srand(time(0));
	
	cout << "Welcome to the Space Lanes v 1.11.02\n\n";
	system("Pause");
	system("cls");
    
	cout << "Would you like to load a saved game?(y/n) ";
	cin >> x;

	if(x == "y" || x == "Y")
	{
		system("cls");
		Load();
	}
	else
	{
		system("cls");
		Charac(); // call chara creation
	}
while(endcheck != -1)//game loop
{	
	system("cls");
	int dice = (rand()%3)+1;
    if(dice == 1)
	{
    Planet();
	}
	else if(dice == 2)
	{
    Fight();
	}
	else
	{
    DeadSpace();
	}
}
    cout << "You were shot down.  You made " << money << " credits in your career and acheived level " << clev <<".\n\n";
	
	system("pause");
	return;
	}


void Charac()

{
	cout << "Please assign your stats\n 1) For Damage\n 2) For Hull durability\n 3) For Reflexs\n\n";
	cout << "Health: " << hp << endl << endl
		 << "Damage: " << cSTR << endl
		 << "HULL: " << cHULL << endl
		 << "Reflex: " << cREF << endl << endl
		 << "Sequence: " << turn << endl;
	for(int i=0; i != z; i++)
	{
		
      	int choose;
        cin >> choose;

	  if(choose == 1)
	  {cSTR=cSTR+1;}
	  else if(choose == 2)
	  {cHULL = cHULL++;}
	  else
	  {cREF = cREF++;}

	  turn = cREF + 5;
	  hp = cHULL * 20;
	system("cls");

	cout << "Please assign your stats.\n 1) For Damage\n 2) For Hull durability\n 3) For Reflex\n\n";
	cout << "Health: " << hp << endl << endl
		 << "Damage: " << cSTR << endl
		 << "HULL: " << cHULL << endl
		 << "Reflex: " << cREF << endl << endl
		 << "Sequence: " << turn << endl;
	}
	clev = clev + 1;
    z = 5;
	system("cls");
	return;
}
void Planet()
{
	
	srand(time(0));
    int x;
	int commod = (rand()%100)+1;
	int bmon = ((rand()%75)+(10*clev))* bounty;
	int levcost = clev*1000;
	int dice = (rand()%5)+0;
	
	string planet[5]=
	{
		"Terra Novus",
	    "Terra Noctus",
		"Terra Rouge",
		"Terra Aqualis",
		"Terra Ager",
	};

	
	money = money + bmon;
	bounty = 0;
    
	
label2:
	while(x != 5)
	{
	  int levcost = clev*1000;
	  int mhp = cHULL * 20;
	  int repair = mhp - hp;
	  
	  system("cls");

	  cout << "\nYou've arrived at " << planet[dice] << endl;
	  cout << "You made " << bmon <<" credits for the pirates you have shot down\n\n";
	  cout << "you have: " << money <<" credits \n";
	  cout << "1) Repair ("<< repair << ")\n";
	  cout << "2) Purchace(" << commod <<")(" << purchace << ") \n" ;
	  cout << "3) Upgrade (" << levcost <<")\n";
	  cout << "4) Save Game \n";
	  cout << "5) Leave \n\n";
	  cin >> x;

	  switch(x)
	  {
	  case 1:
		  if(money < repair)
		  {
			  cout << "I'm sorry, you don't have the funds \n";
			  break;
		  }
		  else
		  {
			  money = money - repair;
			  hp = mhp;
			  break;
		  }
	  case 2:
		if(have == 0)
		{
		  if(money < commod)
		  {
			  cout << "I'm sorry you don't have the funds \n";
			  break;
		  }
		  else
		  {
			  money = money - commod;
			  have = 1;
			  purchace = commod;
			  cout << "Purchace made \n";
			  break;
		  }
		}
		else
		{
			money = money + commod;
			have = 0;
			purchace = 0;
			cout << "product sold\n";
			break;

		}
	 
	  

	  case 3:
		  if(money < levcost)
		  {
			  cout << "I'm sorry, you don't have the funds \n";
			  break;
		  }
		  else
		  {   
			  money = money - levcost;
			  system("cls");
			  Charac();
			  hp = mhp;
			  break;
		  }

		  case 4:
			
			Save();
			cout << "game saved ";
			system("pause");
            break;


	  default:
		  goto label2;
		  break;
	  }
	}
	return;
}

void Fight()
{
	srand(time(0));
	//Enemy Stats

	int eSTR = 1 ;
    int eHULL = 1;
    int eREF = 1;
    int ehp;
    int eturn;
	int a;
	int batend = 1;
	int lev = (rand()%clev)+1;
	

	for(int i = 0; i != (lev * 5);i++)  //generate enemy stats
	{
		int choose = (rand()%3)+1;

	    if(choose == 1)
	    {eSTR=eSTR+1;}
	    else if(choose == 2)
	    {eHULL = eHULL++;}
	    else
	    {eREF = eREF++;}

	  eturn = eREF + 5;
	  ehp = eHULL *20;

	  
	}
      
	
	 while(batend > 0)
	{

label1 :cout << "You have been attacked by a pirate! You have " << hp << " hull points remaining\n\n";
	    cout << "1)Fight\n2)Flee\n\n";
	    
		int cdam = (rand()%(cSTR * 2)) + cSTR; // Player Damage
	    int edam = (rand()%(eSTR * 2)) + eSTR; // Enemy Damage
		int cgo = (rand()%20)+turn;  //Player turn
		int ego = (rand()%20)+eturn;  //Enemy Turn
        
		cin >> a;
		
		system("cls");

		switch(a)
		{
		case 1:
		   
            if (cgo >= ego)
			{

			ehp = ehp - cdam;
			
			if(ehp <= 0)
			{
				cout << "victory";
				system("Pause");
				bounty++;
				batend = -1;
			}
			else
			{
				hp = hp - edam;
				
				if(hp < 0)
				{
					endcheck = -1;
					batend = -1;
				}
				else
				{
		        break;
				}
			}
			}
			else
			{
				hp = hp - edam;

				  if(hp <= 0)
				  {
					  endcheck = -1;
					  batend = -1;
				  }
			

				  else
				  {
					  ehp = ehp - cdam;
					  if (ehp <=0)
					  {
						  cout << "Victory ";
						  system("pause");
						  bounty ++;
						  batend = -1;
						  
					  }
					  else
					  {
						  break;
					  }
				  }
			
					break;
		case 2:
		 
		 hp = hp - edam;
		 
		 if(hp <= 0)
		 {
			 endcheck = -1;
			 batend = -1;
		 }
		 else
		 {
			 cout << "Escaped Successfully ";
			 system("pause");
			 batend = -1;
			 
		 }
		 break;

		

		default:
			
				goto label1;
				break;
         }	

		}
	 }
		  return;
	
		
	 }

void DeadSpace()
{
	cout << "Before you lies the vast and empty trade lanes ";

	system("Pause");
	return;
}

void Save()
{
	ofstream outfile;
	outfile.open("save.sav");
	 outfile << clev << endl;
	 outfile << cSTR << endl;
	 outfile << cHULL << endl; ;
	 outfile << cREF << endl;
	 outfile << money << endl;
	 outfile << have << endl;
	 outfile << purchace << endl;
	 outfile << hp << endl;
	outfile.close();
     return;
}

void Load()
{
	
	int x;
  ifstream infile;
  infile.open("save.sav");
   if(infile.fail() == 1)
   {
	   cout << "File does not exist please make a new charactor and save your game ";
	   system("pause");
	   system("cls");
	   Charac();
	   return;
   }
   else
   {
   infile >> x;
   clev = x;
   infile >> x;
   cSTR = x;
   infile >> x;
   cHULL = x;
   infile >> x;
   cREF = x;
   infile >> x;
   money = x;
   infile >> x;
   have = x;
   infile >> x;
   purchace = x;
   infile >> x;
   hp = x;
   }
   infile.close();

   z = 5;
   cout << "Game Loaded Successfully ";
   system("pause");
   system("cls");
   Planet();
   return;
}

any help would be GREATLY appreciated

[Faldrax]

The thing you need to do first is work out what the logical set of objects are for your game and how they interrelate.
Things that spring to mind from the description are;
Ship - Holds the data on a spaceship, methods to interact with other spaceships, move, etc.
Planet - Holds the data for a given planet, and methods to manipulate that data (such as adjusting current comodity values).
Space - A 'map' of the planets, and how they link together, methods to determine links, time for moving from one to another, etc.
If you are unsure, you might want to look at a less open-ended problem first to get a handle on objects then come back to this one when you are more familiar with them.