Answer to Question #188534 in C++ for sweet jonhy

Question

The class student contains roll number, name, and course as data members and Input_student and display_student as member functions. Create a class exam and publicly inherit it from the student class. The derived class contains an array of marks and no_of_subjects as data members and input_marks and display_result as member functions. Overload “<=”, “()” and “+=” operators and use the overloaded operators in the main function. Create an array of objects of the exam class and display the result of 5 students.

Answer 1

#include <iostream>
#include <string>

using namespace std;


class Student{
private:
	int rollNumber;
	string name;
	string course;
public:


	void input_student(){
		cout<<"Enter the student roll number: ";
		cin>>rollNumber;
		cin.ignore();
		cout<<"Enter the student name: ";
		getline(cin,name);
		cout<<"Enter the student course: ";
		getline(cin,course);
	}
	void display_student(){
		cout<<"The student roll number: "<<rollNumber<<"\n";
		cout<<"The student name: "<<name<<"\n";
		cout<<"The student course: "<<course<<"\n";
	}
	Student & operator+=(int value){
		this->rollNumber+=value;
		return *this;
	}
};


class Exam:public Student{
private:
	// array of marks and no_of_subject
	int marks[100];
	int no_of_subject;
public:
	void input_marks(){
		cout<<"Enter the number of subjects: ";
		cin>>no_of_subject;
		for(int i=0;i<no_of_subject;i++){
			cout<<"Enter the mark of subject "<<(i+1)<<": ";
			cin>>marks[i];
		}
	}
	void display_result(){
		cout<<"The number of subjects: "<<no_of_subject<<"\n";
		for(int i=0;i<no_of_subject;i++){
			cout<<"The mark of subject "<<(i+1)<<": "<<marks[i]<<"\n";
		}
	}
	friend bool operator<= (Exam &Exam1, Exam &Exam2){
		return Exam1.no_of_subject<=Exam2.no_of_subject;
	}
};


int main(){
	//5 students.
	Exam exams[5];
	int n=2;
	for(int i=0;i<n;i++){
		cout<<"Enter the detail information for student "<<(i+1)<<"\n";
		exams[i].input_student();
		exams[i].input_marks();
		cout<<"\n";
	}
	
	for(int i=0;i<n;i++)
	{
		for(int j=1;j<n-i;j++)
		{
			if(exams[j-1]<=exams[j])
			{
				Exam temp=exams[j-1];
				exams[j-1]=exams[j];
				exams[j]=temp;
			}
		}
	}
	cout<<"\n\n";
	for(int i=0;i<n;i++){
		exams[i]+=1000;
		exams[i].display_student();
		exams[i].display_result();
		cout<<"\n";
	}






	system("pause");
	return 0;
}