C++ saving records to file - c++

Question

i've been thinking how to do this "save to file" thing all night, but it seems that luck wasnt on my side.. .
I am new to this, and i want to get learned, thats all.
I am from Bulgaria, and for those who wonder what is "edinen", this is your citizen number as a member of that country. (I still dont know how to explain this...)
Here is what I've got
(I've already included the "fstream", but i still dont know how to use it!
#include <iostream>
#include <stdlib.h>
#include <fstream>
using namespace std;
#define n 30
int num=0;
struct uslugi
{
char name[30];
char surname[30];
char lastname[30];
char illness[30];
long int edinen;
}grupa[n];
void add_record();
void show_record();
void search_record();
void remove_record();
void add_record() // FUNCTION - ADD RECORD(S)
{
system("title Add Record");
int br;
cout<<"\n How many pacients do you want to enter?";
cout<<"\n >> ";
cin>>br;
for(int i=num;i<num+br;i++)
{
cout<<"\n \t\t ENTERING DATA FOR PACIENT NUMBER - "<<i+1<<endl;
cout<<"\n Name:";
cout<<"\n >> ";
cin>>grupa[i].Name;
cout<<"\n Surname:";
cout<<"\n >> ";
cin>>grupa[i].surname;
cout<<"\n Lastname:";
cout<<"\n >> ";
cin>>grupa[i].lastname;
cout<<"\n edinen:";
cout<<"\n >> ";
cin>>grupa[i].edinen;
cout<<"\n Ill from:";
cout<<"\n >> ";
cin>>grupa[i].illness;
}
num=num+br;
}
void show_record() // FUNCTION - SHOW RECORD(S)
{
if (num==0)
{
cout<<"\t\t by far there are no pacient at all \n";
}
cout<<"\n \t\t\t list with all pacients"<<num<<endl;
for(int i=0;i<num;i++)
{
cout<<"\n Name:";
cout<<"\n >> "<<grupa[i].name;
cout<<"\n Surname:";
cout<<"\n >> "<<grupa[i].surname;
cout<<"\n Lastname:";
cout<<"\n >> "<<grupa[i].lastname;
cout<<"\n edinen:";
cout<<"\n >> "<<grupa[i].edinen;
cout<<"\n Ill from:";
cout<<"\n >> "<<grupa[i].illness;
cout<<"\n\n";
}
}
void remove_record() // FUNCTION - DELETE RECORD(S)
{
int k,index;
for(int i=0;i<num;i++)
{
cout<<"\n("<<i+1<<") "<<endl;
cout<<"Pacient name: "<<grupa[i].name<<endl;
cout<<"Surname: "<<grupa[i].surname<<endl;
cout<<"Lastname: "<<grupa[i].lastname<<endl;
cout<<"edinen: "<<grupa[i].edinen<<endl;
cout<<"Ill from: "<<grupa[i].illness<<endl<<endl;
}
cout<<"Who do you want to delete? \n >> ";
cin>>index;
for(k=0;k<num;k++)
{
if(k>=index)
{
grupa[k].edinen=grupa[k+1].edinen;
}
if(k==num-1)
break;
else
cout<<"BY FAR THERE IS NO DATA HERE"<<endl;
}
num--;
for (i=0;i<num;i++)
{
cout<<"Pacient name: "<<grupa[i].name<<endl;
cout<<"Surname: "<<grupa[i].surname<<endl;
cout<<"Lastname: "<<grupa[i].lastname<<endl;
cout<<"edinen: "<<grupa[i].edinen<<endl;
cout<<"Ill from: "<<grupa[i].illness<<endl<<endl;
}
}
void print_count() // FUNCTION - PRINTING
{
cout<<"\n \t\t\t NUMBER OF PACIENTS - "<<num<<endl;
cout<<""<<endl;
}
void search_record() // FUNCTION - SEARCHING
{
int flag=0;
long int tempegn;
cout<<"\n Type the edinen for the pacient you search: ";
cout<<"\n >> ";
cin>>tempegn;
for (int i=0;i<n;i++)
if(tempegn==grupa[i].edinen)
{
cout<<"Pacient name: "<<grupa[i].name<<endl;
cout<<"Surname: "<<grupa[i].surname<<endl;
cout<<"Lastname: "<<grupa[i].lastname<<endl;
cout<<"edinen: "<<grupa[i].edinen<<endl;
cout<<"Ill from: "<<grupa[i].illness<<endl<<endl;
flag++;
}
if (!flag)
{
cout<<"\n\t PACIENT WITH THAT NAME DOESNT EXCIST \n\n";
}
}
void main() // MAIN FUNCTION (MENU)
{
int choice;
do
{
cout<<"\n\t\t******************* Menu *******************"<<endl;
cout<<"\t\t* *";
cout<<"\n\t\t* 1.Add new pacient *";
cout<<"\n\t\t* 2.Search for a pacient by edinen *";
cout<<"\n\t\t* 3.Delete pacient *";
cout<<"\n\t\t* 4.List with all pacients *";
cout<<"\n\t\t* 5.Exit *";
cout<<"\n\t\t* *\n";
cout<<"\t\t************************************************"<<endl;
cout<<"\n Type your choice! ";
cout<<"\n >> ";
cin>>choice;
switch(choice)
{
case 1:{print_count();add_record();break;}
case 2:{print_count();search_record();break;}
case 3:{print_count();remove_record();break;}
case 4:{print_count();show_record();}
}
}
while(choice!=5);
}

Answer 1

I would suggest you read a book, or at least some documentation about this. Also, to understand how this kind of input works, it is required knowledge of oop concepts. As far as I noticed you do not have such a knowledge, I would suggest you stick for a while with procedural i/o functions from C, like fprintf. A google search will show many resources about them and they are pretty easy to understand, at least compared with those from C++, like the ones you are using.
To answer to your question, I will try to explain how to achive what you want. Note that this is a very simplified explanation and not 100% accurate.
Firstly, you need to open the file and create a i/o stream, using ifstream for input files or ofstrsam for output files:
ifstream f("input_filename");
ofstream g("output_filename);
After you created f and/or g (they are not both requied. Also, f and g are just random names) you can use them in the same way you use cin and cout, in this case, as f is for input, it should be used like cin.