Overloading Ostream Operator in C++ – Hacker Rank Solution

 

Problem

The task is to overload the << operator for Person class in such a way that for p being an instance of class Person the result of:

std::cout << p << " " << <some_string_value> << std::endl;

produces the following output:

first_name=<first_name>,last_name=<last_name> <some_string_value>

where:

• <first_name> is the value of p’s first_name_
• <last_name> is the value of p’s last_name_
• <some_string_value> is an arbitrary std::string value

---

Input Format :

The input is read by the provided locked code template. In the only line of the input there are 3 space-separated strings first_name, last_name, event. The values of first_name and last_name will be used to create an object p of type Person. The value of event will be used by the provided code to produce the output.

Constraints :

Each word in the input contains only English letters and is no longer than 15 characters

Output Format :

The output should be produced by the provided locked code template. This code will use the implementation of Person public methods and the overloaded << operator to produce the output. Specifically, the output wiil be produced by the following code:

cout << p << " " << event << endl;

---

Sample Input :

john doe registered

Sample Output :

first_name=john,last_name=doe registered

---

Solution :

//Overloading Ostream Operator in C++ - Hacker Rank Solution
#include <iostream>

using namespace std;

class Person 
{
public:
    Person(const string& first_name, const string& last_name) : first_name_(first_name), last_name_(last_name) {}
    const string& get_first_name() const 
    {
      return first_name_;
    }
    const string& get_last_name() const 
    {
      return last_name_;
    }
private:
    string first_name_;
    string last_name_;
};

// Enter your code here.
/* Overloading Ostream Operator in C++ - Hacker Rank Solution START */
ostream& operator<<(ostream& Output, Person& p) 
{
  Output << "first_name=" << p.get_first_name() << ","
         << "last_name=" << p.get_last_name();
  return Output;
}
/* Overloading Ostream Operator in C++ - Hacker Rank Solution END */

int main() 
{
    string first_name, last_name, event;
    cin >> first_name >> last_name >> event;
    auto p = Person(first_name, last_name);
    cout << p << " " << event << endl;
    return 0;
}