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

What use is a Setname(char *szName) when the GetName() have already sent
out the pointer to the m_szName array? The GetName() method should be
declared
const char* GetName() const;
The First const to say that the returned pointer may not be used to change
the stored name. The second const to say that the GetName() method doesn't
change anything inside the class CEmployee when called.

In fact, all GetXX() methods should be written as:
type GetXX() const;

Since this is C++, and not C, all methods not taking a parameter should be
written with empty parentheses. It is only in C, that the void keyword is
needed.

If using template containers, it might also be an idea to use the map
container instead, to allow direct sort and location of entries on
customer id.

/Per W

On Wed, 23 Oct 2002, Marc Heiligers wrote:

> 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
> 
> 
> 
> 
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