Class and Objects in c++ : Hacker Rank Solution : Techno Learner

1. 
   
   Techno Learner 

   Class and Objects
   
   

Objective

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  exams given during this semester.

Create a class named  with the following specifications:

• An instance variable named  to hold a student's  exam scores.
• A void input() function that reads  integers and saves them to .
• 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  scores from stdin and save them to your  instance variable.

Constraints

Output Format

In the int Student::calculateTotalScore() function, you must return the student's total grade (the sum of the values in ).

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 , the number of students in Kristen's class. The  subsequent lines contain each student's  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  student scored higher than her.

 

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Techno Learner

Solution  C++ :

#include <cmath>

#include <cstdio>

#include <vector>

#include <iostream>

#include <algorithm>

#include <cassert>

using namespace std;

// Write your Student class here

class Student {

  

  public :

    int score[5];

    

    void input() {

        

        for (int i=0; i<5; i++) {

            cin >> score[i];

        }

    }

    

    int calculateTotalScore() {

        int sum =0;

        

        for (int i=0; i<5; i++) {

            sum = sum + score[i];

        }

        return sum;

    } 

    

};

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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