Explore User Defined Functions

// S112 Kowata Explore User Defined Functions.cpp 


//Preprocessor Declarations

#include <iostream>
#include <string>
using namespace std;

//Prototypes 
void experiment0();
void experiment01(int num);
void experiment02(int& num);
void experiment03();
string getName();


int main()
{

    experiment03();

}

//User-defined functions ---------------------------------

//Understanding passing by value and passing by reference 

void experiment03()
{
    string  fullName = getName();
    cout << "You entered: " << fullName;

}

//-----------------------------------------
string getName()
{
    string fName;
    do {
        cout << "Enter a full name: ";
        getline(cin, fName);
        if (fName.length() == 0)
        {
            cout << "invalid name -- cannot be empty\n";
        }
        else
        {
            break;
        }

    } while (true);
    return fName;
}

//-----------------------------------------
void experiment0()
{
int n = 100;
cout << "Before experiment01\n";
cout << "n before calling: " << n << endl;
experiment02(n);
cout << "n after calling: " << n << endl;
cout << "After experiment01\n";
cout << "\nAll Done\n";
}

//num accepts data by VALUE (copy)
void experiment01(int num)
{
    cout << "Inside experiment01\n";
    cout << num << endl;
    num++;
    cout << num++ << endl;
}

//num accepts data by REFERENCE (address of)
void experiment02(int& num)
{
    cout << "Inside experiment02\n";
    cout << num << endl;
    num++;
    cout << num++ << endl;
}