Question

Create a class called Student. This class will hold the first name, last name, and test grades for a student. Use separate files to create the class (.h and .cpp)

Private Variables

• Two strings for the first and last name

• A float pointer to hold the starting address for an array of grades

• An integer for the number of grades

Constructor

• This is to be a default constructor

• It takes as input the first and last name, and the number of grades.

• It sets the name variables and the integer variable for the size

• It allocates memory for the grades array based on the number of grades passed in

Destructor

• free up memory associated with the array for the grades

A public method to enter the grades one at a time.

• This is a void method.

• The input is a float for the grade and an integer for the location in the grade array

• The method places the grade in the appropriate spot in the array

A public method that returns a specific grade

• This is a float method

• Input is an index number into the grade array

• Returns the grade at the index number passed in

A public method to compute the average

• This is a float method

• Returns the average of all the grades

A public method to return the full name of the student

• Has no inputs

• returns a string of the student's full name

Main function

• Ask the user to enter the first name, last name, and number of grades for a student

• Create a student instance and pass the user entered information to the constructor

• Using a loop ask the user to enter all the grades for the student. Place that data in the instance using the appropriate method

• Using the appropriate method, print the full name of the student

• Using a for loop and the appropriate method print out all the grades of a student

• Using the appropriate method, print out the average grade of the student

Answer 1

#include <iostream>
#include <string>

using namespace std;

//Student class
class Student{
//private variables
private   :
   string firstName, lastName;
   float* grades;
   int noOfGrades;

public:
   //default constructor
   Student(string _firstName, string _lastName, int _noOfGrades){
       firstName = _firstName;
       lastName = _lastName;
       noOfGrades = _noOfGrades;
       grades = new float[_noOfGrades];
   }
   //destructor to delete the dynamically allocated grades array
   ~Student(){
       delete[] grades;
   }
   //method to set a particular grade
   void setGrade(float grade, int index){
       grades[index] = grade;
   }
   //method to get a particular grade at the given index
   float getGrade(int index){
       return grades[index];
   }
   //method to compute the average of the grades
   float getAverage(){
       float totalMarks = 0;
       for(int i = 0; i < noOfGrades; i++){
           totalMarks += grades[i];
       }
       return totalMarks/noOfGrades;
   }

   //method to return the full name of the student
   string getName(){
       string fullName = firstName + " " + lastName;
       return fullName;
   }
};

//main method to show the working of above student class
int main(){

   //variable to get the values from the user
   string firstName, lastName;
   int noOfGrades;

   //taking information from the user
   cout << "Enter the first name of the Student : ";
   cin >> firstName;
   cout << "\nEnter the last name of the Student : ";
   cin >> lastName;
   cout << "\nEnter the number of grades : ";
   cin >> noOfGrades;

   //creating a instance of the Student class
   Student student(firstName,lastName,noOfGrades);
   cout << "\nEnter the Grades of the Student :\n";

   //for loop to set the grades of the student from the user
   float grade;
   for(int i = 0; i < noOfGrades; i++){
       cin >> grade;
       student.setGrade(grade,i);
   }

   //printing the details using appropriate methods

   //using getName method to print the full name of the student
   cout << "\nName of the Student is : " << student.getName();

   //using getGrade method to print all the grades of the student inside a for loop
   cout << "\nGrades of the Student are :\n";
   for(int i = 0; i < noOfGrades; i++){
       cout << student.getGrade(i) << "\n";
   }

   //using getAverage method to print the average of grades
   cout << "\nAverage of Grades is :" << student.getAverage();
}

Ouput:

Enter the first name of the Student Aman Enter the last name of the Student : Sharma Enter the number of grades : 5 Enter the Grades of the Student : 90 89 92 85 100 Name of the Student is : Aman Sharma Grades of the Student are : 100 Average of Grades is :91.2