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Game of craps

Jubbly (7)
Hey guys, I'm trying to make a game of craps right now, but I'm having a few issues.

My first problem is I have no idea how to make it ask for another bet when I want to continue, it just adds/subtracts from the previous total.
Any help would be appreciated.

Second problem is right now when I run my program, it works if my numbers do not = 7 and the yes/no function still works.
But when it does = 7 and it asks to continue its just ends my program.

main code
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#include <iostream>

using namespace std;

#include <stdlib.h>
#include <math.h>
#include <time.h>
#include "header.h"


void main ()
	{
		int		start (50);
		int		bet (0);
		int		point (0);
		int		total (0);
		bool	a;

		char ans;

		cout << "You have $50. How much will you bet?" <<endl;
		cin >> bet;

		if ((bet < 0 ) || (bet > 50))
			do 
	{	cout << "Invalid bet. Enter another bet. " <<endl;
		cin >> bet;
	}
		while ((bet < 0) || (bet > 50));

		srand (time (0));

		total = ThrowDie () + ThrowDie ();

		switch (total)
	{
			case 7:
			case 11:
				start = start + bet;
				cout << "You rolled " << total << ". You won!" << endl;
				cout << "You now have $" << start << "." << endl;
				
				cout << "Play again? (Y/N)" << endl;
				cin >> ans;

				switch (ans)
				{
				case 'y':
				case 'Y':
					a = true;
						break;
				case 'n':
				case 'N':
					a = false;
					exit (0);
					cout << "Bye" << endl;
						break;
				default:
					cout << "Not valid. Enter another answer" <<endl;
					break;
				}
				{
				while (true);
				}
			case 2:
			case 3:
			case 12:
						start = start - bet;
						cout << "You rolled " << total <<". You lost." << endl;
						cout << "You now have $" << start <<"." << endl;
						cout << "Play again? (Y/N)" << endl;
						cin >> ans;

				switch (ans)
				{
				case 'y':
				case 'Y':
					a = true;
						break;
				case 'n':
				case 'N':
					a = false;
					exit (0);
					cout << "Bye" << endl;
						break;
				default:
					cout << "Not valid. Enter another answer" <<endl;
					break;
				}

			default:
			case 1:
			case 4:
			case 5:
			case 6:
			case 8:
			case 9:
			case 10:
					point = total;
					cout << "You rolled " <<  total << ". Roll again " << endl;
					do
	  {
						total = ThrowDie () + ThrowDie ();
						cout << "You rolled " << total << endl;
						if (total == point)
	  					{
						start = start + bet;
						cout << " You rolled " << total << endl;
						cout << "You won! " << endl;
						cout << "You now have $ " << start << "." << endl;
						cout << "Play again? (Y/N) " << endl;
						cin >> ans;
						}
						
						else if (total == 7);
						{
						start = start - bet;
						cout <<"You lost," << endl;
						cout <<"You now have $ " << start << "." << endl;
						cout <<"Play again? (Y/N)" << endl;
						cin >> ans;
						}

							switch (ans)
				{
				case 'y':
				case 'Y':
					a = true;
						break;
				case 'n':
				case 'N':
					a = false;
					exit (0);
					cout << "Bye" << endl;
						break;
				default:
					cout << "Not valid. Enter another answer" <<endl;
					break;
							}
		
						
	  }
			while (total != point && total !=7);
	  
		}
		

		}


header cpp
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#include <stdlib.h>	
#include <time.h>

#include "header.h"

void Initialize ()
	{
	srand (time (0));
	}

int ThrowDie ()
	{
	return (rand () % 6) + 1;
	}

int ThrowDice ()
	{
	return ThrowDie () + ThrowDie ();
	}


header
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#ifndef DICE_H
#define DICE_H

void	Initialize	();
int		ThrowDie	();
int		ThrowDice	();

#endif


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