Create a complete program based on the following criteria: (a) Create class Stud

Question

Create a complete program based on the following criteria:
(a) Create class Student.
(i) data members (protected): name (string), location (string), age (int).
(ii) member functions : - constructor to display “Student Details”

(b) Create class Marks.
(i) data members (protected): marks[3] (float) , grade (char).
(ii) member functions : - void mark_entry() --- get user input for marks
(using for loop).
- void average() --- calculate average of 3 marks.
Call function set_grade(..).
- void set_grade(..) --- determine grade.
If average >= 80, grade = ‘A’
If average >= 50, grade = ‘B’
If average >= 0, grade = ‘C’

(c) Create class Result which inherits publicly from class Student and class Marks.
(i) data members : semester (int).
(ii) member functions : - void setStudent() --- get user input for name,
location, age, semester
- void display() --- display name, location, age,.
Semester, all the marks and grade.

(d) In main()
(i) Declare a pointer called Stud1 that points to an object of class Result (created
using the new operator).
(ii) Using the pointer Stud1, call setStudent(), mark_entry(), average() and
display().
(iii) Delete the object.
(iv) Repeat the steps above by getting the number of students in main() during
runtime.(here you have to use Dynamic Memory Allocation)


//Solution
#include<iostream>
#include<string>
using namespace std;

class Student
{
protected :
string name, location;
int age;
public :
Student()
{
cout<<"---------------------------------------------"<<endl;
cout<<" Student Details "<<endl;
cout<<"---------------------------------------------"<<endl;
}
};

class Marks
{
protected :
float marks [3];
char grade;

public :
void mark_entry()
{
float sum=0;
cout<<"--------------------------------------------"<<endl;
cout<<" Marks Details "<<endl;
cout<<"--------------------------------------------"<<endl;

for (int i=0;i<3;i++)
{
cout<<"Enter Marks : ";
cin>>marks[i];
sum+=marks[i];

}
}

void average()
{
float average,sum;
average=sum/3;
void set_grade(float average);
}
void set_grade(float average)
{
if(average>=80)
{
grade= 'A';

}

else if (average>=50)
{
grade= 'B';

}

else
{
grade= 'C';

}
}

};

class Result:public Student, public Marks
{
protected :
int semester;

public :
void setStudent()
{
cout<<"Enter Name : ";
cin>>name;
cout<<"Enter Location : ";
cin>>location;
cout<<"Enter Age : ";
cin>>age;
cout<<"Enter Semester : ";
cin>>semester;
}

void display()
{
cout<<"--------------------------------------------"<<endl;
cout<<" Result Slip "<<endl;
cout<<"--------------------------------------------"<<endl;
cout<<"Name : "<<name<<endl;
cout<<"Location : "<<location<<endl;
cout<<"Age : "<<age<<endl;
cout<<"Semester : "<<semester<<endl;
for(int i=0;i<3;i++)
{
cout<<"Marks "<<i+1<<" : "<<marks[i]<<endl;
}
cout<<"Grade : "<<grade<<endl;

}

};


int main()
{
int number;
cout<<"Please Enter The Number Of Student : ";
cin>>number;
for(int i=0;i<number;i++)
{
class Result *Stud1;
Stud1= new Result;
(*Stud1).setStudent();
(*Stud1).mark_entry();
(*Stud1).average();
(*Stud1).display();

delete Stud1;
}
system("pause");
return 0;

}

Explanation / Answer

#include <iostream>
#include <string>
using namespace std;

class Student
{
protected:
   string name;
   string location;
   int age;
public:
   Student()
   {
      cout << "---------------------------------------------" << endl;
      cout << " Student Details " << endl;
      cout << "---------------------------------------------" << endl;
   }
};


class Marks
{
protected:
   float marks[3];
   char grade;
public:
   void mark_entry()
   {
      cout << "--------------------------------------------" << endl;
      cout << " Marks Details" << endl;
      cout << "--------------------------------------------" << endl;
      for (int i = 0; i < 3; i++)
      {
         cout << "Enter Marks: ";
         cin >> marks[i];
         //You don't need the variable "sum" here, since mark_entry() is used for getting user input only, you don't have to calculate anything yet
      }
   }

   void average()
   {
      float average = 0.0; //initialize average = 0.0
      for (int i = 0; i < 3; i++)
      {
         average += marks[i]; //use average as "sum"
      }
      average /= 3.0; //after adding up all the marks, calculate its average here
      set_grade(average); //don't declare function's type and parameter's type again when you call the function
   }

   void set_grade(float average)
   {
      if(average >= 80)
      {
         grade = 'A';
      }
      else if (average >= 50)
      {
         grade = 'B';
      }
      else
      {
         grade = 'C';
      }
   }
};


class Result : public Student, public Marks
{
protected:
   int semester;
public:
   void setStudent()
   {
      cout << "Enter Name: ";
      cin >> name;
      cout << "Enter Location: ";
      cin >> location;
      cout << "Enter Age: ";
      cin >> age;
      cout << "Enter Semester: ";
      cin >> semester;
   }

   void display()
   {
      cout << "--------------------------------------------" << endl;
      cout << " Result Slip" << endl;
      cout << "--------------------------------------------" << endl;
      cout << "Name: " << name << endl;
      cout << "Location: " << location << endl;
      cout << "Age: " << age << endl;
      cout << "Semester: " << semester << endl;
      for(int i = 0; i < 3; i++)
      {
         cout << "Marks " << i+1 << ": " << marks[i] << endl;
      }
      cout << "Grade: " << grade << endl;
   }
};


int main()
{
   int number;
   cout << "Please Enter The Number Of Student: ";
   cin >> number;
   for (int i = 0; i < number; i++)
   {
      Result *Stud1; //you don't need keyword "class" here
      Stud1 = new Result;
      Stud1->setStudent(); // (*Stud1). equals to Stud1->
      Stud1->mark_entry();
      Stud1->average();
      Stud1->display();

      delete Stud1;
   }

   cin.ignore(); //use other codes to pause the program than system("pause");
   cin.get();
   return 0;
}

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