Question

#ifndef STUDENTTESTSCORES_H
#define STUDENTTESTSCORES_H
#include <string>
using namespace std;

const double DEFAULT_SCORE = 0.0;

class StudentTestScores
{
private:
   string studentName;  // The student's name
   double *testScores;  // Points to array of test scores
   int numTestScores;   // Number of test scores

    // Private member function to create an
    // array of test scores.
   void createTestScoresArray(int size)
   { numTestScores = size;
     testScores = new double[size]; 
     for (int i = 0; i < size; i++)
        testScores[i] = DEFAULT_SCORE; }
        
public:
    // Constructor
   StudentTestScores(string name, int numScores)
   { studentName = name;
     createTestScoresArray(numScores); }

    // Destructor
   ~StudentTestScores()
   { delete [] testScores; }

    // The setTestScore function sets a specific
    // test score's value.
   void setTestScore(double score, int index)
   { testScores[index] = score; }

    // Set the student's name.
   void setStudentName(string name)
   { studentName = name; }

    // Get the student's name.
   string getStudentName() const
   { return studentName; }
   
   // Get the number of test scores.
   int getNumTestScores()
   { return numTestScores; }

    // Get a specific test score.
   double getTestScore(int index) const
   { return testScores[index]; }
};
#endif

Download the header file “StudentTestScores.h” - Carefully read the class declaration and understand how its inline functions work. -

Design a program that uses the class and allows the user to enter and read multiple students’ names and grades.

Add the following functions to the class:

1. A copy constructor. Test your program for how the constructor will be used.

For example: The statement StudentTestScores stu2 = stu1;

Will call the copy constructor that will initialize stu2 with all the member data in stu1 including values in the testScores member array of stu1.

2. Overload the assignment operator so that the statement stu3 = stu4; copies all the values from stu4 into stu3 (you may need to resize testScores array)

3. A member function that returns the average test score of a student.

Sample call: cout<<stu5.avg()<<endl;

4. A member function that displays the minimum test score along with the test number. Sample output: Test 2 has the minimum score; 73.

5. Overload the “>” operator. For example: stu6 > stu7 compares the average test scores for both students and returns true if stu6 average is greater than stu7 average, false otherwise

Notes:

§ DO NOT make any changes in StudentTestScores class other than adding the listed functions

. § DO NOT add a default constructor

§ You do not have to use vectors

§ Design the output in any way you want so that you fully demonstrate the class, all its member functions, and the copy constructor for multiple of students

§ Hint: check how to define an array of pointers.

Sample Output (as a guide)

Enter number of students: 3

Enter name of student 1: John Doe

Enter number of test scores for John Doe: 4

Test Score 1: 70

Test Score 2: 90

Test Score 3: 80

Test Score 4: 98

Enter name of student 2: Allan Smith

Enter number of test scores for Allan Smith: 3

Test Score 1: 90

Test Score 2: 83

Test Score 3: 72

Enter name of student 3: Tom Allen

Enter number of test scores for Tom Allen: 5

Test Score 1: 81

Test Score 2: 74

Test Score 3: 61

Test Score 4: 90

Test Score 5: 56

The above is not the full output. You should demonstrate the operations of other member functions and the copy constructor in the class. You may define individual objects for testing the operations.

Answer 1

Please find the code below:

StudentTestScores.h

#ifndef STUDENTTESTSCORES_H
#define STUDENTTESTSCORES_H
#include <string>
#include <iostream>
using namespace std;

const double DEFAULT_SCORE = 0.0;

class StudentTestScores
{
private:
   string studentName; // The student's name
   double *testScores; // Points to array of test scores
   int numTestScores; // Number of test scores

   // Private member function to create an
   // array of test scores.
   void createTestScoresArray(int size)
   { numTestScores = size;
   testScores = new double[size];
   for (int i = 0; i < size; i++)
       testScores[i] = DEFAULT_SCORE; }

public:
   // Constructor
   StudentTestScores(string name, int numScores)
   { studentName = name;
   createTestScoresArray(numScores); }

   StudentTestScores()
       { }

   // Destructor
   ~StudentTestScores()
   { delete [] testScores; }

   void getUserInput(){
       for(int j=0;j<numTestScores;j++){
           cout<<"Test Score "<<j+1<<" : ";
           cin>>testScores[j];
       }
   }

   /* Copy constructor */
   StudentTestScores (const StudentTestScores &sam){
       studentName = sam.studentName;
       numTestScores = sam.numTestScores;
       testScores = new double[numTestScores];
       for (int i = 0; i < sam.numTestScores; i++)
           testScores[i] = sam.testScores[i];
   }

   StudentTestScores & operator = (const StudentTestScores &sam)
   {
       studentName = sam.studentName;
       numTestScores = sam.numTestScores;
       testScores = new double[numTestScores];
       for (int i = 0; i < sam.numTestScores; i++)
           testScores[i] = sam.testScores[i];
       return *this;
   }

   double avg(){
       double total = 0;
       for (int i = 0; i < numTestScores; i++)
           total += testScores[i];
       return total*1.0/numTestScores;
   }

   void displayMinReport(){
       double min = 99999;
       int index ;
       for (int i = 0; i < numTestScores; i++){
           if(min>testScores[i]){
               min=testScores[i];
               index = i;
           }
       }
       cout<<"Test "<<index+1<<" has the minimum score;"<<min<< ".";
   }

   bool operator > (StudentTestScores &sam){
       return this->avg()>sam.avg();
   }
   // The setTestScore function sets a specific
   // test score's value.
   void setTestScore(double score, int index)
   { testScores[index] = score; }

   // Set the student's name.
   void setStudentName(string name)
   { studentName = name; }

   // Get the student's name.
   string getStudentName() const
   { return studentName; }

   // Get the number of test scores.
   int getNumTestScores()
   { return numTestScores; }

   // Get a specific test score.
   double getTestScore(int index) const
   { return testScores[index]; }
};
#endif

main.cpp

#include "StudentTestScores.h"

using namespace std;
int main()
{
   int num;
   cout<<"Enter number of students: ";
   cin>>num;
   StudentTestScores students[num];
   string studentName;
   int numTestScores;
   for(int i=0;i<num;i++){
       cout<<"Enter name of student "<<i+1<<" : ";
       getline(cin,studentName);
       while(studentName=="" || studentName=="\n"){
               getline(cin,studentName);
       }
       cout<<"Enter number of test scores for "<<studentName<<" : ";
       cin>>numTestScores;
       StudentTestScores s(studentName,numTestScores);
       students[i] = s;
       students[i].getUserInput();
   }

   for(int i=0;i<num;i++){
       cout<<"Result for "<<students[i].getStudentName()<<endl;
       cout<<"Average : "<<students[i].avg()<<endl;
       students[i].displayMinReport();
       cout<<"***************"<<endl;
   }
   return 0;
}

WORKSPACE\c_language_workspace CPP\student\main.cpp - [Executing] - Dev-C++ 5.11 Edit Search View Project Execute Tools Style Window Help K:\WORKSPACE\c_language_workspace CPP\student\main.exe Enter number of students: 2 rt Enter name of student 1: john Doe, Enter number of test scores for john Doe : 3 Test Score 1 : 12 Test Score 2 : 23 Test Score 3 : 34 Enter name of student 2: srk here Enter number of test scores for srk here : 4 Test Score 1 : 232 Test Score 2 : 232 Test Score 3 : 343 Test Score 4 : 45 Result for john Doe Average : 23 Test 1 has the minimum score; 12. *************** Result for srk here Average : 213 Test 4 has the minimum score;45. * * * ** * * ** * * ** * * - - - - - - - - - - - - - - - - - - - - - - - - - Process exited after 12.67 seconds with return value o Press any key to continue ...