C++ and can you write the Main function in a separate file? Also have Person.hpp

Question

C++ and can you write the Main function in a separate file? Also have Person.hpp, Person.cpp. and stdDev.cpp in a separate file. No global variables!

Project 7.b Write a class called Person that has two data members - a string variable called name and a double variable called age. It should have a constructor that takes two values and uses them to initialize the dai mcm bers. It should he?ve gci: mci hods fr both (lata mcm )crs (getName and getAge), but doesn't need any set methods. Write a separate function (not part of the Person class) called stdDev that takes two parameters - an array of Person objects and the size of the array- and returns the standard deviation of all the ages (the population standard deviation that uses a denominator of N, not the sample standard deviation, which uses a different denominator). The files must be named Person.hpp, Person.cpp and stdDev.cpp

Explanation / Answer

//Person.h

#pragma once

#include<iostream>

#include<string>

using namespace std;

class Person

{

string name;

int age;

public:

Person(){}

Person(string str, int n);

string getName() const;

int getAge() const;

};

---------------------------------------------------------------

//Person.cpp

#include"Jul_28_Person.h"

Person::Person(string str, int n)

{

name = str;

age = n;

}

string Person::getName() const

{

return name;

}

int Person::getAge() const

{

return age;

}

-------------------------------------------------------

//stdDev.cpp

#include<cmath>

#include"Jul_28_Person.h"

double stdDev(Person arr[], int n);

//function definition

double stdDev(Person arr[], int n)

{

double sum=0,mean,dev;

//first find mean and then

for (int i = 0; i < n; i++)

{

sum += arr[i].getAge();

}

mean = sum / n;

sum = 0;

for (int i = 0; i < n; i++)

{

sum += pow(arr[i].getAge() - mean,2);

}

dev = sqrt(sum/n);

return dev;

}

---------------------------------------------

//main.cpp

#include"Jul_28_Person.h"

//since function is declared in another file stdDev.cpp ,,we need to declare as extern in main function

extern double stdDev(Person arr[], int n);

int main()

{

//declare a pointer to object Person

Person *persons;

string name;

int n,age;

cout << "Enter how many persons? ";

cin >> n;

//allocate memory for n number of person

persons = new Person[n];

for (int i = 0; i < n; i++)

{

cout << "Enter the name of a person: ";

cin >> name;

cout << "Enter the age of a Person: ";

cin >> age;

//initialize

persons[i] = Person(name, age);

}

//now calculate standard deviation of age

cout<<"Standard deviation is: "<<stdDev(persons, n)<<endl;

}

/*output

Enter how many persons? 5

Enter the name of a person: John

Enter the age of a Person: 24

Enter the name of a person: Smith

Enter the age of a Person: 28

Enter the name of a person: Mary

Enter the age of a Person: 30

Enter the name of a person: Samantha

Enter the age of a Person: 32

Enter the name of a person: Ronald

Enter the age of a Person: 35

Standard deviation is: 3.70945

*/

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