Answer to Question #293721 in C++ for Mohammed

Question

About assignment of c++

In put

Each Student name

Each Student father name

Each Student id number

Number of students

Number of subject

Each subject

Each subject credit hours

Each subject grade

Then calculate GPA

Out put

Student name

Student father name

Student Id number

GPA

If grade is F the student is fail.

The program must be display if you ask one student information.

Answer 1

#include <iostream>
#include <vector>


class Subject
{
private:
	std::string name;
	double mark;
	int credit_value;
public:
	Subject();
	~Subject();


	const std::string& get_name()
	{
		return name;
	}
	const double& get_mark()
	{
		return mark;
	}
	const int& get_credit_value()
	{
		return credit_value;
	}


	void set_credit_value(const int& credit_value)
	{
		this->credit_value = credit_value;
	}
	void set_name(const std::string& name)
	{
		this->name = name;
	}
	void set_mark(const double &mark)
	{
		this->name = name;
	}


	void input_subject()
	{
		std::cout << "Enter subject name : ";
		std::cin >> name;
		std::cout << "Enter mark : ";
		std::cin >> mark;
		std::cout << "Enter credit value : ";
		std::cin >> credit_value;
	}
	void output_subject()
	{
		std::cout << name << " : " << mark<<" , Credit value : "<<credit_value << std::endl;
	}






};


Subject::Subject()
{
}


Subject::~Subject()
{
}




class Student
{
public:
	Student();
	~Student();


	void set_name(const std::string& name)
	{
		this->name = name;
	}
	void set_surname(const std::string& surname)
	{
		this->surname = surname;
	}
	void set_father_name(const std::string& father_name)
	{
		this->father_name = father_name;
	}
	void set_id(const int& id)
	{
		this->id = id;
	}


	const std::string& get_name()
	{
		return name;
	}
	const std::string& get_surname()
	{
		return surname;
	}
	const std::string& get_father_name()
	{
		return father_name;
	}
	const int& get_id()
	{
		return id;
	}
	const std::vector<Subject>& get_marks()
	{
		return marks;
	}
	void add_mark(const Subject& mark)
	{
		marks.push_back(mark);
	}


	void input_student()
	{
		int subjects=0;
		std::cout << "Enter student name : ";
		std::cin >> name;
		std::cout << "Enter student surname : ";
		std::cin >> surname;
		std::cout << "Enter student father name : ";
		std::cin >> father_name;
		std::cout << "Enter student id : ";
		std::cin >> id;
		std::cout << "Number of subjects : ";
		std::cin >> subjects;
		marks.resize(subjects);
		for (int i = 0; i < subjects; i++)
		{
			marks[i].input_subject();
		}
	}


	void output_student()
	{
		std::cout << name << " " << surname << " " << father_name << std::endl;
		std::cout << "Marks : ";
		for (int i = 0; i < marks.size(); i++)
		{
			marks[i].output_subject();
		}
		double gpa = this->calculate_gpa();
		if (gpa >= 90 && gpa <= 100)
		{
			std::cout << "GPA : "<<gpa<<" , A\n";
		}
		else if (gpa >= 85 && gpa < 90)
		{
			std::cout << "GPA : " << gpa << " , B\n";
		}
		else if (gpa >= 75 && gpa < 85)
		{
			std::cout << "GPA : " << gpa << " , C\n";
		}
		else if (gpa >= 65 && gpa < 75)
		{
			std::cout << "GPA : " << gpa << " , D\n";
		}
		else if (gpa >= 60 && gpa < 65)
		{
			std::cout << "GPA : " << gpa << " , E\n";
		}
		else if (gpa >= 0 && gpa < 60)
		{
			std::cout << "GPA : " << gpa << " , F , the student is fail\n";
		}
		std::cout << std::endl;
	}


	double calculate_gpa()
	{
		double res = 0;
		double tmp1 = 0, tmp2 = 0;
		for (int i = 0; i < marks.size(); i++)
		{
			tmp1 += marks[i].get_mark()*marks[i].get_credit_value();
			tmp2 += marks[i].get_credit_value();
		}
		res = (double)tmp1 / (double)tmp2;
		return res;
	}


private:
	std::string name;
	std::string surname;
	std::string father_name;


	int id;


	std::vector<Subject> marks;


};


Student::Student()
{
}


Student::~Student()
{
}




int main()
{
	std::vector<Student> students;


	int size = 0;


	std::cout << "Enter number of students : ";
	std::cin >> size;


	students.resize(size);
	for (int i = 0; i < size; i++)
	{
		students[i].input_student();
	}




	std::cout << "\nStudents :";
	for (int i = 0; i < size; i++)
	{
		std::cout <<'\n' << i + 1 << ".";
		students[i].output_student();
	}


	int id = 0;
	std::cout << "Enter student id : ";
	std::cin >> id;


	bool found = 0;
	for (int i = 0; i < students.size(); i++)
	{
		if (students[i].get_id() == id)
		{
			std::cout << "\n";
			students[i].output_student();
			std::cout << "\n";
			found = 1;
			break;
		}
	}


	if(!found)
	{
		std::cout << "There is no student with such id\n";
	}


	system("pause");
	return 0;


}