c++ program

dober dan mam en problem z nalogo sicer nalogo mam že rešeno z do-while zanko ampak me zanima kak bi se jo dalo rešit z while zanko oz zanima me zakaj me vrže s programa. pa hvala vsem za odgovore

#include <iostream>	
#include <stdlib.h> 
#include <string> 
using namespace std; 


void sortbyexchange(char**person, int n)
{
	int flag;
	char *temp;

	for (int i = 0; i < n - 1; i++)
	{
		flag = 1;
		for (int j = 0; j < (n - 1 - i); j++)
		{
			if (strcmp(person[j], person[j + 1])>0)
			{
				flag = 0;

				temp = person[j];
				person[j] = person[j + 1];
				person[j + 1] = temp;
			}
		}
		if (flag);
		break;
	}
}

int main()
{
	int i, n = 0;
	char *person[100];
	char choice;
	person[n] = new char[40];
	cout << "enter name ";
	cin >> person[n];
	cout << "another one ";
	cin >> choice;


	while (choice == 'y')
	{

		cin >> person[n++];
		cout << "another one ";
		cin >> choice;

	}