Answer to Question #105848 in C++ for Aliasghar

Question

• We want to calculate the total marks of each student of a class in Physics, Chemistry and Mathematics and the average marks of the class. The number of students in the class are entered by the user. Create a class named Marks with data members for roll number, name and marks. Create three other classes inheriting the Marks class, namely Physics, Chemistry and Mathematics, which are used to define marks in individual subject of each student. Roll number of each student will be generated automatically.

Answer 1

#include <iostream>
#include <vector>
#include <numeric>


using namespace std;


class Marks
{
public:
    Marks(int roll_number,const string& name,const std::vector<int>& marks)
        :roll_number(roll_number),name(name),marks(marks)
    {
    }


    double average(){
        return static_cast<double>(totalMarks())/marks.size();
    }
    int totalMarks(){
        int sum=0;
        return std::accumulate(marks.begin(),marks.end(),sum);
    }
private:
     int roll_number;
     string name;
     std::vector<int> marks;
};


class Physics : public Marks
{
public:
    Physics(int roll_number,const string& name,const std::vector<int>& marks)
        :Marks(roll_number,name,marks)
    {}
};


class Chemistry : public Marks
{
public:
    Chemistry(int roll_number,const string& name,const std::vector<int>& marks)
        :Marks(roll_number,name,marks)
    {}
};


class Mathematics : public Marks
{
public:
    Mathematics(int roll_number,const string& name,const std::vector<int>& marks)
        :Marks(roll_number,name,marks)
    {}
};