I received an email inviting me to solve the Classes and Objects challenge at HackerRank. If interested please take a look at the requirements and give it a try before reading my solution.

The requirements call for the design of a class with two methods. One of them reads grades from standard input while the other computes the total score for a set of five grades.

Following is a screen capture of the console generated using the provided sample input:

3 30 40 45 10 10 40 40 40 10 10 50 20 30 10 10 1

Seems that there is a student (grades for Kristen are on the first row) that has better scores.

Following is my solution implemented using C++ using Visual Studio 2017 Enterprise Edition:

#include <cmath> #include <cstdio> #include <vector> #include <iostream> #include <algorithm> #include <cassert> using namespace std; class Student { // **** **** public: int grades[5]; /* */ void input() { for (int i = 0; i < 5; i++) { cin >> grades[i]; } } /* */ int calculateTotalScore() { int total = 0; for (int i = 0; i < 5; i++) { total += grades[i]; } return total; } }; int main() { int n; // number of students cin >> n; // **** create array of students **** Student *s = new Student[n]; // an array of n students // **** populate grades **** for (int i = 0; i < n; i++) { s[i].input(); } // **** calculate kristen's score **** int kristen_score = s[0].calculateTotalScore(); //cout << "main <<< kristen_score: " << kristen_score << endl; // **** 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; }

This code passed the 11 test cases.

If you have comments or questions regarding this post please leave them in the space provided after the post. I will respond as soon as possible.

Enjoy;

John

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