Connect 4 Game In C++ Program

C Program,

Two players play that game , it’s slightly different from tic tac toe. The difference is:
1. The player who plot 4 of his/her marks (cross or zero) horizontaly , verticaly , diagonaly , counter diagonal any way but in a straight line makes first wins.
2.There is the base from where every player start the game.

/**********************************
	   SOURCE CODE
**********************************/
 
#include 
#include 
#include 
#include 
 
 
char re_assign[31] = {'o','1','2','3','4','5','6'};
char square[31];
		    //horizontal                                                                                                                                                                                                               //diagonal                                                                              //opp diagonal                                                                             //for vetical
int check[39][4] = { {1,2,3,4} , {2,3,4,5} ,{3,4,5,6} ,{7,8,9,10} ,{8,9,10,11} , {9,10,11,12} , {13,14,15,16} , {14,15,16,17} , {15,16,17,18} , {19,20,21,22} , {20,21,22,23} , {21,22,23,24} ,{25,26,27,28} , {26,27,28,29} , {27,28,29,30} , {1,8,15,22} , {2,9,16,23} , {3,10,17,24} , {7,14,21,28} , {8,15,22,29} ,{9,16,23,30} , {4,9,13,18} , {5,10,14,19} , {6,11,15,20} , {10,15,20,25} , {11,16,21,26} , {12,17,22,27} , {1,7,13,19} , {7,13,19,25} , {2,8,14,20} , {8,14,20,26} , {3,9,15,21} , {9,15,21,26} , {4,10,16,22} , {10,16,22,28} , {5,11,17,23} , {11,17,23,29} , {6,12,18,24} , {12,18,24,30} };
char plr1[40],plr2[40];
int score1=0,score2=0, game=0 ,games;
int choice_m,choice_vm;
int checkwin();
void input_name();
void show_name(int);
void new_game();
void new_match();
void new_series();
void show();
void board();
 
struct player
{
char playername[50];
int score;
int game,games;
};
player pl1,pl2;
 
void main()
{
	do
	{
 
	show();
	cout<<"\n\n                      1.Continue previous series.";
	cout<<"\n                      2.Start a new game.";
	cout<<"\n                      3.Quit Game.";
	cout<<"\n\n                      Enter your choice.";
	cin>>choice_vm;
		switch(choice_vm)//choice_vm=choice of void main
		{
		case 1:
		clrscr();
		show();
		fstream fin;
		fin.open("player_info.dat",ios::binary|ios::in);
		if(!fin)
		{
		cout<<"\n\n                      NO! saved sereis found ???";
		getch();
		break;
		}
		fin.read((char*)&pl1,sizeof(pl1));
		strcpy(plr1,pl1.playername);
		score1=pl1.score;
		game=pl1.game;
		games=pl1.games;
		fin.read((char*)&pl2,sizeof(pl1));
		strcpy(plr2,pl2.playername);
		score2=pl2.score;
		fin.close();
		new_series();
		break;
 
		case 2:
		new_game();
		break;
 
		case 3:
 
		show();
		cout<<"\n\n                      Bye...";
		getch();
		break;
 
		default:
		cout<<"\n                      Wrong choice";
		getch();
 
		}
       }
       while(choice_vm != 3);
}
 
/***************************************************/
//starting of a new game
/***************************************************/
void new_game()
{
input_name();
do
{
 
show();
cout<<"\n\n                      NEW GAME MENU";
cout<<"\n\n                      1.Start a match up game.";
cout<<"\n                      2.Start a series of this game.";
cout<<"\n                      3.To Quit.";
cout<<"\n\n                      Enter your choice";
cin>>choice_m;
	switch (choice_m)
	{
		case 1:
		new_match();
		break;
 
		case 2:
		new_series();
		break;
 
		case 3:
		break;
 
		default:
		cout<<"\n                      Wrong choice";
		getch();
	}
}
while(choice_m!=3);
}
 
 
/*********************************************/
//to start a new game
/*********************************************/
void new_match()
{
 
	int player = 1,i,s1=1,s2=2,s3=3,s4=4,s5=5,s6=6;
	char mark,choice_g;
 
	for(int z=0;z<=31;z++) //to reassign value
	square[z]=re_assign[z];
	if(choice_m == 2)
	player=(game%2)?2:1;
	do
	{
		board();
		player=(player%2)?1:2;
		cout <<"\n                    It's ";
		show_name(player);
		cout<< "'s turn , enter a number:  ";
		cin >> choice_g;
		mark=(player == 1) ? 'X' : 'O';
		if (choice_g == '1' && s1 <= 25)
		{
			square[s1] = mark;
			s1+=6;
			square[s1]='1';
		}
		else if (choice_g == '2' && s2 <= 26)
		{
			square[s2] = mark;
			s2+=6;
			square[s2]='2';
		}
		else if (choice_g == '3' && s3 <= 27)
		{
			square[s3] = mark;
			s3+=6;
			square[s3]='3';
		}
		else if (choice_g == '4' && s4 <= 28)
		{
			square[s4] = mark;
			s4+=6;
			square[s4]='4';
		}
		else if (choice_g == '5' && s5 <= 29)
		{
			square[s5] = mark;
			s5+=6;
			square[s5]='5';
		}
		else if (choice_g == '6' && s6 <= 30)
		{
			square[s6] = mark;
			s6+=6;
			square[s6]='6';
		}
		else if (choice_g == 'q' || choice_g == 'Q')
		{
		show();
		cout<<"\n\n\a                      ==>Game quited.";
		getch();
			if(choice_m == 2)
			game--;
		return;
		}
		else
		{
			cout<<"\n                    Invalid move ";
			player--;
			getch();
		}
		i=checkwin();
		player++;
	}while(i==-1);
	board();
	if(i==1)
	{
	--player;
		if(choice_m == 2)
		{
			if(player==1)
			score1++;
			else
			score2++;
		}
	cout<<"                    ==>\a";show_name(player);cout<<" win !!! ";
	}
	else
	{
		cout<<"                    ==>\aGame draw";
		if(choice_m == 2)
		{
		score1++;score2++;
		}
	}
	getch();
}
/*********************************************
start a new series
**********************************************/
void new_series()
{
clrscr();
int choice_s;
if(choice_vm != 1)
{
score1=score2=0;
show();
cout<<"\n\n                      How many games you want to play.";
cin>>games;
	if(games>50)
	{
	cout<<"\n                      Error!@!?!@!";
	getch();
	return;
	}
 
}
 
	do
	{
	show();
	cout<<"\n\n      	                 SERIES MENU";
	cout<<"\n\n		       1.Start the new game.";
	cout<<"\n                       2.Show the score.";
	cout<<"\n                       3.Quit and save series.";
	cout<<"\n\n                       Enter your choice";
	cin>>choice_s;
 
		switch (choice_s)
		 {
		  case 1:
			clrscr();
			new_match();
			game++;
			if(game == games)
			{
				show();
				if(score1>score2)
				cout<<endl<<endl<<"\a                      ==>"<<plr1 <<" won the series !!";
				else if(score1<score2)
				cout<<endl<<endl<<"\a                      ==>"<<plr2 <<" won the series !!";
				else
				cout<<"\n\n\a                      ==>Series Draw !!!";
				getch();
			return;
			}
		  break;
 
		  case 2:
		  show();
		  cout<<"\n\n                      Total games - "<<games;
		  cout<<"\n\n                      SCORES";
		  cout<<"\n\n                      "<<plr1<<" - "<<score1<<endl;
		  cout<<"                      "<<plr2<<" - "<<score2;
		  getch();
		  break;
 
		  case 3:
		  show();
		  fstream fout;
 
		  fout.open("player_info.dat",ios::binary|ios::out);
		  if(fout)
		  {
		  char o;
		  show();
		  cout<<"\n\n                      Do you want to overwrite previous series?(Y/N)";
		  cin>>o;
		  if(o=='n' || o=='n')
		  break;
		  }
 
		  strcpy(pl1.playername,plr1);
		  pl1.score=score1;
		  strcpy(pl2.playername,plr2);
		  pl2.score=score2;
		  pl1.game=game;
		  pl1.games=games;
 
		  fout.write((char*)&pl1,sizeof(pl1));
		  fout.write((char*)&pl2,sizeof(pl1));
 
		  show();
		  cout<<"\n\n                      Series saved";
		  getch();
		  fout.close();
		  break;
 
		  default:
		  cout<<"\n                      Wrong choice";
		  getch();
		  }
	}
	while(choice_s != 3);
 
}
/*********************************************
	FUNCTION TO RETURN GAME STATUS
	1 FOR GAME IS OVER WITH RESULT
	-1 FOR GAME IS IN PROGRESS
	O GAME IS OVER AND NO RESULT
**********************************************/
 
int checkwin()
{
	//*****************************//
 
	//to check if anybdy won the game...
 
	int l=0;
	for(int m=0;m<=39;m++)
	{
	if(square[check[m][l]] == square[check[m][l+1]] && square[check[m][l+1]] == square[check[m][l+2]] && square[check[m][l+2]] == square[check[m][l+3]] && ((square[check[m][l]] == 'X') || (square[check[m][l]] == 'O')))
		{
		square[check[m][l]] = square[check[m][l+1]] = square[check[m][l+2]] = square[check[m][l+3]] = '';
		return 1;
		}
	}
 
	//*****************************//
 
	//*****************************//
	//for draw
 
	int count1=0;
	for(int draw1=1;draw1<=30;draw1++)
	{
	if( square[draw1] == 'X' || square[draw1] == 'O')
	count1++;
	}
 
 
	if(count1==30)
	return 0;
 
	/***********************************************/
 
	//nobody win till now
 
	else
		return -1;
}
/**************************************************/
//FUNCTION TO INSERT NAME
/**************************************************/
void input_name()
{
clrscr();
	show();
	cout<<"\n\n                      Enter the first player name.";
	gets(plr1);
	cout<<"\n                      Enter the second player name.";
	gets(plr2);
}
/*******************************************************/
//FUNCTION TO SHOW NAME
/*******************************************************/
void show_name(int z)
{
if(z == 1)
cout<<plr1;
else
cout<<plr2;
}
/*******************************************************************
//FUNCTION YO SHOW GAME CONNECT FOUR
/*******************************************************************/
void show()
{
clrscr();
cout<<"\n\n\n\n                      GAME CONNECT FOUR";
}
/*******************************************************************
     FUNCTION TO DRAW BOARD OF SHAGGY's GAME WITH PLAYERS MARK
********************************************************************/
 
 
void board()
{
	clrscr();
	cout <<endl<<endl;
	cout <<"\n\n   		        "<< "    GAME CONNECT FOUR   \n\n";
	cout <<"                    "<< plr1<<" (X)";if(choice_m == 2) cout<<" - "<<score1;cout<<"   ::   "<<plr2<<" (O)";if( choice_m == 2) cout<<" - "<<score2; cout<< endl << endl;
	cout <<"\n                    "<< "Press q to quit from the game."<<endl<<endl;
	cout <<"                    "<< "     |     |     |     |     |     " << endl;
	cout <<"                    "<< "  ";cout<<square[25];cout <<"  |  "; cout<< square[26]; cout << "  |  " ; cout<< square[27]; cout <<"  |  "; cout<<square[28];cout<<"  |  "; cout<<square[29];cout<<"  |  "; cout<<square[30];cout<< endl;
	cout <<"                    "<< "_____|_____|_____|_____|_____|_____" << endl;
	cout <<"                    "<< "     |     |     |     |     |     " << endl;
	cout <<"                    "<< "  ";cout<<square[19];cout <<"  |  "; cout<< square[20]; cout << "  |  " ; cout<< square[21]; cout <<"  |  "; cout<<square[22];cout<<"  |  "; cout<<square[23];cout<<"  |  "; cout<<square[24];cout<< endl;
	cout <<"                    "<< "_____|_____|_____|_____|_____|_____" << endl;
	cout <<"                    "<< "     |     |     |     |     |     " << endl;
	cout <<"                    "<< "  ";cout<<square[13];cout <<"  |  ";  cout<< square[14]; cout << "  |  " ; cout<< square[15]; cout <<"  |  "; cout<<square[16];cout<<"  |  "; cout<<square[17];cout<<"  |  "; cout<<square[18];cout<< endl;
	cout <<"                    "<< "_____|_____|_____|_____|_____|_____" << endl;
	cout <<"                    "<< "     |     |     |     |     |     " << endl;
	cout <<"                    "<< "  ";cout<<square[7];cout <<"  |  "; cout<< square[8]; cout << "  |  " ; cout<< square[9]; cout <<"  |  "; cout<<square[10];cout<<"  |  "; cout<<square[11];cout<<"  |  "; cout<<square[12];cout<< endl;
	cout <<"                    "<< "_____|_____|_____|_____|_____|_____" << endl;
	cout <<"                    "<< "     |     |     |     |     |     " << endl;
	cout <<"                    "<< "  " << square[1] <<"  |  " << square[2] << "  |  " << square[3] <<"  |  "<<square[4]<<"  |  "<<square[5]<<"  |  "<<square[6]<< endl;
	cout <<"                    "<< "     |     |     |     |     |     " << endl;
 
}
 
/*******************************************************************
				END OF CODE
********************************************************************/