Classes and Objects – Hacker Rank Solution | HackerRank Programming Solutions | HackerRank C++ Solutions

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C++ Prorgramming Solutions

Hello Programmers/Coders, Today we are going to share solutions of Programming problems of HackerRank of Programming Language C++ . At Each Problem with Successful submission with all Test Cases Passed, you will get an score or marks. And after solving maximum problems, you will be getting stars. This will highlight you profile to the recruiters.

In this post, you will find the solution for Classes and Objects in C++-HackerRank Problem. We are providing the correct and tested solutions of coding problems present on HackerRank. If you are not able to solve any problem, then you can take help from our Blog/website.

Use “Ctrl+F” To Find Any Questions Answer. & For Mobile User, You Just Need To Click On Three dots In Your Browser & You Will Get A “Find” Option There. Use These Option to Get Any Random Questions Answer.

Introduction To C++

C++ is a general-purpose programming language that was developed as an enhancement of the C language to include object-oriented paradigm. It is an imperative and a compiled language. 

C++ is a middle-level language rendering it the advantage of programming low-level (drivers, kernels) and even higher-level applications (games, GUI, desktop apps etc.). The basic syntax and code structure of both C and C++ are the same. 

C++ programming language was developed in 1980 by Bjarne Stroustrup at bell laboratories of AT&T (American Telephone & Telegraph), located in U.S.A. Bjarne Stroustrup is known as the founder of C++ language.

Classes and Objects – Hacker Rank Solution

Problem

A class defines a blueprint for an object. We use the same syntax to declare objects of a class as we use to declare variables of other basic types. For example:

Box box1;          // Declares variable box1 of type Box
Box box2;          // Declare variable box2 of type Box

Kristen is a contender for valedictorian of her high school. She wants to know how many students (if any) have scored higher than her in the 5 exams given during this semester.
Create a class named student with the following specifications:

  • An instance variable named score to hold a 5 student’s exam scores.
  • A void input() function that reads 5 integers and saves them to scores.
  • An int calculateTotalScore() function that returns the sum of the student’s scores.

Input Format :

Most of the input is handled for you by the locked code in the editor.
In the void Student::input() function, you must read 5 scores from stdin and save them to your score instance variable.

Constraints :

  • 1<= n <= 100
  • 1<= examscore <= 50

Output Format :

In the int Student::calculateTotalScore() function, you must return the student’s total grade (the sum of the values in scores). The locked code in the editor will determine how many scores are larger than Kristen’s and print that number to the console.

Sample Input :

The first line contains n, the number of students in Kristen’s class. The n subsequent lines contain each student’s 5 exam grades for this semester.

3
30 40 45 10 10
40 40 40 10 10
50 20 30 10 10

Sample Output :

1

Explanation :

Kristen’s grades are on the first line of grades. Only 1 student scored higher than her.

Classes and Objects – Hacker Rank Solution
#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <cassert>
using namespace std;

// Write your Student class here
class Student 
{
    private:
    int scores[5];
    public:
    void input()
    {
        for (int i = 0; i < 5; i++) 
        {
            cin >> scores[i];
        }
    }
    int calculateTotalScore() 
    {
        int count = 0;
        for (int i = 0; i < 5; i++) 
        {
            count += scores[i];
        }
        return count;
    }
};
int main() 
{
    int n; // number of students
    cin >> n;
    Student *s = new Student[n]; // an array of n students
    
    for(int i = 0; i < n; i++)
    {
        s[i].input();
    }
    
    // calculate kristen's score
    int kristen_score = s[0].calculateTotalScore();

    // determine how many students scored higher than kristen
    int count = 0; 
    for(int i = 1; i < n; i++)
    {
        int total = s[i].calculateTotalScore();
        if(total > kristen_score)
        {
            count++;
        }
    }

    // print result
    cout << count;
    
    return 0;
}

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