RE: [Dev-C++] Question about structs...

[Marc H. <ma...@e-...>]

Hi,
If you build an array of structs as you have below, you have a fixed number
of records. It might be a good idea to build your data structure (and I
suggest using a class which you can then use to validate data and perform
operations on your data) and then storing your "records" in a STL vector, or
similar. This allows you to dymaically change the number of employee, etc.
etc. etc. So you'd get something like:

A file called "employee.h", for example
_____________________________
#include <vector>

using namespace std;

class CEmployee
{
public:
	CEmployee();	//constructor - init code
	~CEmployee();	//destructor - clean up code
public:
	BOOL SetId(int nId);		//Get and set methods for props
	int GetId(void);
	BOOL SetAge(int nAge);
	int GetAge(void);
	BOOL SetSalary(float fSalary);
	float GetSalary(void);
	BOOL SetName(char *szName);
	char* GetName(void);
private:
	//private properties
	int m_nId;
	int m_nAge;
	float m_fSalary;
	char m_szName[25];
}

typedef vector<CEmployee*> EMPLOYEES_DATABASE;

_____________________________
And then use
_____________________________
#include <iostream>
#include "employee.h"

int main(void)
{
	EMPLOYEES_DATABASE database;
	CEmployee *employee = new CEmployee(); 	//Create new employee
	employee->SetName("Marc Heiligers");	//Set employee properties
	employee->SetAge(27);
	employee->SetId(0);
	employee->SetSalary(1000000.00);
	database.push_back(employee);			//Add employee to
end of vector
	.
	.
	.
	cout << "Number of employees: " << database.size() << endl;

	//Use an iterator to loop through all employees and print their
names.
	EMPLOYEES_DATABASE::iterator iter;
	for (iter = database.begin(); iter != database.end; iter++)
	{
		employee = *iter;
		cout << "Name: " << employee->GetName() << endl;
	}
	return 0;
}
_____________________________
So, to answer your question (umm, this may have been a bit of overkill),
yes, you can use employee_name[25] array. You would access each "record"
with a for loop. But there is no need to loop through the name array unless
you want to search the name for a particular character.

_____________________________
Marc Heiligers


-----Original Message-----
From: Rob Peacock [mailto:py...@ea...] 
Sent: 22 October 2002 06:35 PM
To: dev...@li...
Subject: [Dev-C++] Question about structs...


OK, I'm back for more information. I'm looking at a slightly different way
of building the database I asked about yesterday.

The examples I have seen for a structure are typically a database. Here's
the one I have seen posted on several newbie sites:

#include <iostream.h>

struct database
{
  int id_number;
  int age;
  float salary;
};

int main()
{
  database employee;
  employee.age=22;
  employee.id_number=1;
  employee.salary=120000.21;

  return 0;
}

My question is this; this struct as it is written will only hold one record,
and all of the entries are int's. If I wanted to have multiple records using
the same struct, can I create a struct array (correct
terminology?) like this:

struct database[100]
{
  int id_number;
  char employee_name[25];
  int age;
  float salary;
};

To populate it, or to access the individual records within the array, I
would use the standard for() loops, correct? Same with the emplyee_name[]
array?

Thanks all,

--->Rob