# 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;
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.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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