Classes and Objects - Hacker Rank Solution
Problem
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.
- An instance variable named score to hold a 5 student's 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.
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 score instance variable.
Constraints :
- 1<= n <= 100
- 1<= 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 :
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 | //Classes and Objects - Hacker Rank Solution #include <cmath> #include <cstdio> #include <vector> #include <iostream> #include <algorithm> #include <cassert> using namespace std; // Write your Student class here class Student { private: int scores[5]; public: void input() { for (int i = 0; i < 5; i++) { cin >> scores[i]; } } int calculateTotalScore() { int count = 0; for (int i = 0; i < 5; i++) { count += scores[i]; } return count; } }; 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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