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Write/read stack in file

Alex Kostadinov (1)
So i got this program to do and i am stuck..
The main point is to build a program that writes in file several changing bureaus
with name and address for them, several currency and its buy/sell values
and some other functions so i managed to do that but i cannot write properly and cant read at all..
here is my code:
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 #include<iostream>
#include<string>
#include<fstream>
#include<stdlib.h>
using namespace std;
int n,i,g;
int pos=0,posi=0;//pos is my counter for the bureaus and posi is for the currencies 
struct valuta
{
	string ime;// this is the name of the currency 
	double kupuva;// the buy value
	double prodava;// the sell value
};
struct bura
{
	string ime;//this is the name of the bureau 
	string adres;//the address
	valuta val[10];
};
bura b[30];
void regis()
{
	cout<<"vavedete broq na burata:";//here i input the number of  bureaus
	cin>>n;
	cout<<"\n vavedete broq na valutite v burata:";/the number of currency 
	cin>>g;
	for(i=0;i<n;i++)
	{
		cin.ignore();
	cout<<"\n vavedete imeto na buroto:";//name input
	getline(cin,b[pos].ime);
	cout<<"\n vavedete adresa na buroto:";//address input
	getline(cin,b[pos].adres);
	for(int j=0;j<g;j++)
	{
	cout<<"\n vavedete imeto na-"<<j+1<<"-valuta:";//currency name input
	cin>>b[pos].val[posi].ime;
	cout<<"\n vavedete kurs kopuva:";//buy value 
	cin>>b[pos].val[posi].kupuva;
	cout<<"\n vavedete kurs prodava:";//sell value
	cin>>b[pos].val[posi].prodava;
	posi++;
	}
	pos++;
	}
		ofstream buras("buras.txt",ios::app);
	if(buras.is_open())
	for(i=pos-n;i<pos;i++)
	{
		buras<<b[i].ime<<endl;
		buras<<b[i].adres<<endl;
		for(int j=posi-g;j<posi;j++)
		{
		buras<<b[i].val[j].ime<<endl;
		buras<<b[i].val[j].kupuva<<endl;
		buras<<b[i].val[j].prodava<<endl;
		}
	}
	buras.close();
}
void akt()
{
	string imee;
	string valu;
	cin.ignore();
	cout<<"\n vavedete imeto na buroto v koeto iskate da aktualizirate informaciq:";
	getline(cin,imee);
	for(i=0;i<pos;i++)
	if(imee==b[i].ime)
	{
		cout<<"\n vavedete valutata koqto iskate da aktualizirate:";
		cin>>valu;
		for(int j=0;j<posi;j++)
		if(valu==b[i].val[j].ime)
		{
			cout<<"\n vavedete noviq kurs kopuva:";
			cin>>b[i].val[j].kupuva;
			cout<<"\n vavedete noviq kurs prodava:";
			cin>>b[i].val[j].prodava;
		}
	}
		ofstream buras("buras.txt");
	if(buras.is_open())
	for(i=pos-n;i<pos;i++)
	{
		buras<<b[i].ime<<endl;
		buras<<b[i].adres<<endl;
		for(int j=posi-g;j<posi;j++)
		{
		buras<<b[i].val[j].ime<<endl;
		buras<<b[i].val[j].kupuva<<endl;
		buras<<b[i].val[j].prodava<<endl;
		}
	}
	buras.close();
}
void print()
{
	string valutaa;
	cout<<"\n vavedete valuta koqto iskate da izvedete:";
	cin>>valutaa;
	cout<<"\n kursovete na valutata vyv vsi4ki bura e:"<<endl;
	for(i=0;i<pos;i++)
	for(int j=0;j<posi;j++)
	if(valutaa==b[i].val[j].ime)
	{
		cout<<"ime na buroto:"<<b[i].ime<<" ;adres na buroto:"<<b[i].adres<<";"<<b[i].val[j].ime<<"-kopuva:"<<b[i].val[j].kupuva<<"-prodava:"<<b[i].val[j].prodava<<endl;
	}
}
void minimal()
{
	string valuu;
	string im;
	int min=99;
	cout<<"\n vavedete valuta koqto iskate da proverite:";
	cin>>valuu;
	for(i=0;i<pos;i++)
	for(int j=0;j<posi;j++)
	if(valuu==b[i].val[j].ime)
	{
	if(min>b[i].val[j].prodava)
	{
		min=b[i].val[j].prodava;
		im=b[i].ime;
	}
	}
	cout<<"minimalnata valuta koqto izbrahte se prodava vyv:"<<im;
}

int main()
{

	ifstream fin;
	fin.open("buras.txt");
	for(i=0;i<pos;i++)
	{
		fin>>b[pos].ime;
		fin>>b[pos].adres;
		for(int j=0;j<posi;j++)
		{
		fin>>b[pos].val[posi].ime;
		fin>>b[pos].val[posi].kupuva;
		fin>>b[pos].val[posi].prodava;
		posi++;
		}
		pos++;
	}
	fin.close();
	int choice;
	do
	{
             //here is just my menu i dont need to translate that 
		cout<<"\n 1.Vyvejdane na danni";
		cout<<"\n 2.Aktualizaciq na dannite za teku6tite kursove na burata";
		cout<<"\n 3.Izvejdane iformaciq za valutata ot vsi4ki bura";
		cout<<"\n 4.minimalna valuta";
		cout<<"\n 5.exit";
		cout<<"\n your choice:";
		cin>>choice;
		switch(choice)
		{
		case 1:regis();break;
		case 2:akt();break;
		case 3:print();break;
		case 4:minimal();break;
		case 5:break;
		}
	}while(choice!=5);
	return 0;
}

so and when i start it and try to input data this happens: 3 bureaus with 2 currencies in each one
first bureau
some street
-here is supposed to be the name of the 1st currency but it's blank
0
0
-name of the 2nd
0
0
second bureau
some street2
-same story
0
0
-and again..
0
0
third bureau
3rd street
euro
1
1.4
pound
2.2
2.4
on the third one everything is fine.. i think i have problems with my counters or my cycles but i cant seem to find it
i am asking for help :)/>/> and sorry the program is not on еnglish, but еnglish is not my native language
i hope you can solve it ://>/>
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