Algorithm


Problem Name: Classes and Objects

Problem Link: https://www.hackerrank.com/challenges/classes-objects/problem?isFullScreen=true

In this HackerRank Functions in C++ programming problem solution,

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 scoresto hold a student's 5 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.

Constraints

1 <= n <= 100

0 <= examscore <= 50

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

 

 

 

 

 

Code Examples

#1 Code Example with C++ Programming

Code - C++ Programming


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

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

int main(void)
{
    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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Input

x
+
cmd
3 30 40 45 10 10 40 40 40 10 10 50 20 30 10 10

Output

x
+
cmd
1
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Demonstration


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