How to print the name of every salesman from Salesman class? - c++

Question

Here I implemented a c++ program using OOP concepts. Let's say there are 1000 salesmen (1000 Salesman Class objects) in a company. If I want to print the name of each and every salesman (using a loop or something), how to do it? Not only for printing the name, let's say the company wants to find the average salary spent. It can be easy that if I can run over all objects in the class.
This is my code (I put the code here just for reference)
#include <string>
#include <iostream>
class Salesman
{
private:
int salesmanId;
string salesmanName;
int salary;
string contactNumber;
public:
Salesman();
~Salesman();
void setSalesmanDetails(int id, string name, int sal, string number);
void displaySalesmanDetails();
void setSalesmanContactNumber(string number);
};
void Salesman ::setSalesmanDetails(int id, string name, int sal, string number)
{
salesmanId = id;
salesmanName = name;
salary = sal;
contactNumber = number;
}
void Salesman ::displaySalesmanDetails()
{
cout << "Salesman ID: " << salesmanId << endl;
cout << "Salesman Name: " << salesmanName << endl;
cout << "Salary: " << salary << endl;
cout << "Contact Number: " << contactNumber << endl
<< endl;
}
void Salesman::setSalesmanContactNumber(string number)
{
contactNumber = number;
}
Salesman::Salesman()
{
}
Salesman::~Salesman()
{
}
int main(int argc, char *argv[])
{
string number;
Salesman *s1 = new Salesman;
s1->setSalesmanDetails(1, "John", 30000, "772358375");
Salesman *s2 = new Salesman;
s2->setSalesmanDetails(2, "Ann", 40000, "773029452");
Salesman *s3 = new Salesman;
s3->setSalesmanDetails(3, "Leema", 35000, "778294526");
}

Answer 1

Just make a class that stores a vector that holds SalesMan objects. Give that class the ability to add salesMan and another member function to iterate through all the salesmen and print the details.
class SalesMen
{
public:
SalesMen() = default;
public:
void AddSalesMan(const Salesman& salesMan)
{
salesMen.push_back(salesMan);
}
void PrintDetails()
{
for (auto& salesMan : salesMen)
{
salesMan.displaySalesmanDetails();
}
}
private:
std::vector<Salesman> salesMen;
};
int main(int argc, char* argv[])
{
SalesMen salesMen{};
Salesman s1;
s1.setSalesmanDetails( 1, "John", 30000, "772358375" );
salesMen.AddSalesMan(s1);
Salesman s2;
s2.setSalesmanDetails(2, "Ann", 40000, "773029452");
salesMen.AddSalesMan(s2);
Salesman s3;
s3.setSalesmanDetails(3, "Leema", 35000, "778294526");
salesMen.AddSalesMan(s3);
salesMen.PrintDetails();
}

Answer 2

For the output of a class, you need to overwrite the insertion operator <<. In this, you do nearly the same as in your display function. With that, you can output your code to std::cout or a file or any other stream.
Please read about operator overloading and especially the inserter and the extractor.
And in your main function, you do can simply use a std::vector to store your salesman.
And then output verything in a simple loop using the above insertion operator.
Please see the below example code:
#include <string>
#include <iostream>
#include <fstream>
#include <vector>
using std::string;
using std::cout;
using std::endl;
class Salesman
{
private:
int salesmanId;
string salesmanName;
int salary;
string contactNumber;
public:
Salesman();
~Salesman();
void setSalesmanDetails(int id, string name, int sal, string number);
void displaySalesmanDetails();
void setSalesmanContactNumber(string number);
friend std::ostream& operator << (std::ostream& os, const Salesman& sm) {
return os << "Salesman ID: " << sm.salesmanId << endl
<< "Salesman Name: " << sm.salesmanName << endl
<< "Salary: " << sm.salary << endl
<< "Contact Number: " << sm.contactNumber << endl << endl;
}
};
void Salesman ::setSalesmanDetails(int id, string name, int sal, string number)
{
salesmanId = id;
salesmanName = name;
salary = sal;
contactNumber = number;
}
void Salesman ::displaySalesmanDetails()
{
cout << "Salesman ID: " << salesmanId << endl;
cout << "Salesman Name: " << salesmanName << endl;
cout << "Salary: " << salary << endl;
cout << "Contact Number: " << contactNumber << endl
<< endl;
}
void Salesman::setSalesmanContactNumber(string number)
{
contactNumber = number;
}
Salesman::Salesman()
{
}
Salesman::~Salesman()
{
}
int main(int argc, char *argv[])
{
std::vector<Salesman> salesman{};
string number;
Salesman s1;
s1.setSalesmanDetails(1, "John", 30000, "772358375");
salesman.push_back(s1);
Salesman s2;
s2.setSalesmanDetails(2, "Ann", 40000, "773029452");
salesman.push_back(s2);
Salesman s3;
s3.setSalesmanDetails(3, "Leema", 35000, "778294526");
salesman.push_back(s3);
for (const Salesman& sm : salesman)
std::cout << sm;
}