HackerRank Class solution in c++ programming

In this HackerRank class problem solution in c++ programming language, Classes in C++ are user defined types declared with keyword class that has data and functions . Although classes and structures have the same type of functionality, there are some basic differences. The data members of a class are private by default and the members of a structure are public by default. Along with storing multiple data in a common block, it also assigns some functions (known as methods) to manipulate/access them. It serves as the building block of Object Oriented Programming.

It also has access specifiers, which restrict the access of member elements. The primarily used ones are the following:

public: Public members (variables, methods) can be accessed from anywhere the code is visible.

private: Private members can be accessed only by other member functions, and it can not be accessed outside of class.

Class can be represented in the form of

class ClassName {

    access_specifier1:

        type1 val1;

        type2 val2;

        ret_type1 method1(type_arg1 arg1, type_arg2 arg2,...)

        ...

    access_specifier2:

        type3 val3;

        type4 val4;

        ret_type2 method2(type_arg3 arg3, type_arg4 arg4,...)

        ...

};

We can store details related to a student in a class consisting of his age (int), first_name (string), last_name (string) and standard (int).

You have to create a class, named Student, representing the student's details, as mentioned above, and store the data of a student. Create setter and getter functions for each element; that is, the class should at least have following functions:

1. get_age, set_age
2. get_first_name, set_first_name
3. get_last_name, set_last_name
4. get_standard, set_standard

Also, you have to create another method to_string() which returns the string consisting of the above elements, separated by a comma(,). 

HackerRank Class problem solution in c++ programming.

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

class Student{
    int age;
    int standard;
    string first_name;
    string last_name;
public:
    Student()
    {
        age = 0;
        standard = 0;
        first_name.clear();
        last_name.clear();
    }
    void set_age(int newAge)
    {
        age = newAge;
    }
    void set_standard(int newStandard)
    {
        standard = newStandard;
    }
    void set_first_name(string newFirst_name)
    {
        first_name = newFirst_name;
    }
    void set_last_name(string newLast_name)
    {
        last_name = newLast_name;
    }
    int get_age() {return age;}
    int get_standard() {return standard;}
    string get_first_name() {return first_name;}
    string get_last_name() {return last_name;}
    
    string to_string()
    {
        stringstream ss;
        char c = ',';
        ss << age << c << first_name << c << last_name << c << standard;
        return ss.str();
    }
    
};
int main() {
    int age, standard;
    string first_name, last_name;
    
    cin >> age >> first_name >> last_name >> standard;
    
    Student st;
    st.set_age(age);
    st.set_standard(standard);
    st.set_first_name(first_name);
    st.set_last_name(last_name);
    
    cout << st.get_age() << "\n";
    cout << st.get_last_name() << ", " << st.get_first_name() << "\n";
    cout << st.get_standard() << "\n";
    cout << "\n";
    cout << st.to_string();
    
    return 0;
}

Second solution

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

/*
Enter code for class Student here.
Read statement for specification.
*/
class Student{
    public:
        int age, standard;
        string first_name, last_name;
        void set_age(int a){
            age = a;
        }
        void set_first_name(string a){
            first_name = a;
        }
        void set_last_name(string a){
            last_name = a;
        }
        void set_standard(int a){
            standard = a;
        }
        int get_age(){
            return age;
        }
        string get_first_name(){
            return first_name;
        }
        string get_last_name(){
            return last_name;
        }
        int get_standard(){
            return standard;
        }
	   string t_string(){
           string s = "";
           s+=to_string(age);
           s+=",";
           s+=first_name;
           s+=",";
           s+=last_name;
           s+=",";
           s+=to_string(standard);
           return s;
	   }
};

int main() {
    int age, standard;
    string first_name, last_name;
    
    cin >> age >> first_name >> last_name >> standard;
    
    Student st;
    st.set_age(age);
    st.set_standard(standard);
    st.set_first_name(first_name);
    st.set_last_name(last_name);
    
    cout << st.get_age() << "\n";
    cout << st.get_last_name() << ", " << st.get_first_name() << "\n";
    cout << st.get_standard() << "\n";
    cout << "\n";
    cout << st.t_string();
    
    return 0;
}