Classes and Objects – HackerRank Solution

Classes and Objects – HackerRank Solution

Problem :

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 scores to hold a student’s 5 exam scores.
  • 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 scores instance variable.

Constraints :

  • 1 <= n <= 100
  • 0 <= 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.

Solution :

#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <cassert>
using namespace std;

class Student {
    private:
        int sum;
        int num[5];
    public:
        void input() {
            for (int i = 0; i < 5; i++) {
                cin >> num[i];
            }
        }
        int calculateTotalScore() {
            for (int i = 0; i < 5; i++) {
                sum += num[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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