Question

hello there. can you please help me to complete this code. thank you.

Lab #3 - Classes/Constructors

Part I - Fill in the missing parts of this code

#include<iostream>

#include<string>

#include<fstream>

using namespace std;

class classGrades

     {

     public:

           void printlist() const;

           void inputGrades(ifstream &);

           double returnAvg() const;

           void setName(string);

           void setNumStudents(int);

           classGrades();

           classGrades(int);

     private:

           int gradeList[30];

           int numStudents;

           string name;

     };

int main()

{

    

     classGrades intro(5), intermediate;

     intro.printlist();

     ifstream infile;

     infile.open("data.txt");

     if (!infile)

     {

           cout << "Error opening file!" << endl;

           exit(1);

     }

    

     //set the name of the classGrades object intro to CSC126

    

     //set the name of the object intermediate to CSC211

    

    

     intermediate.setNumStudents(4);

     //input the grades for intermediate from a file

    

//print the intermediate grades

     //print the average of the intermediate grades

    

}

void classGrades::printlist() const

{

     int i;

     cout<< "***" << name<< "***" <<numStudents<< endl;

     for (i =0; i < numStudents; i++)

           cout << i << ' ' << gradeList[i] << endl;

}

void classGrades::inputGrades(ifstream & in )

           {

                int i;

                for (i = 0; i< numStudents; i++)

                     in >> gradeList[i];

           }

double classGrades::returnAvg() const

           {

                int i;

                double average;

                double sum = 0;

                //write code to return the average

           }

          

void classGrades::setName(string n)

           {

                name = n;

           }

void classGrades::setNumStudents(int x)

           {

                numStudents = x ;

           }

classGrades::classGrades()

           {

                int i;

                name = "";

                numStudents = 30;

                for (i = 0; i< 30; i++)

                     gradeList[i] = 0;

           }

classGrades::classGrades(int n)

           {

                int i;

                name = "";

                numStudents = n;

                for (i = 0; i< n; i++)

                     gradeList[i] = 0;

           }

Part II - Syntax for arrays of objects

classGrades allCS[15]; //the default constructor is applied to                                     //all elements of this array

                             //to set the number of students in each class to 25

for (i = 0; i < 15; i++)

     {

           allCS[i].setNumStudents(25);

     }

     //Assume values in all classes. Write the code to print all class averages?

Answer 1

please do upvote if you have any problem do comment and i shall be happy to help you.Thanks for using HomeworkLib.

-------------------------------------------

#include<iostream>

#include<string>

#include<fstream>

using namespace std;

class classGrades

{

public:

void printlist() const;

void inputGrades(ifstream&);

double returnAvg() const;

void setName(string);

void setNumStudents(int);

classGrades();

classGrades(int);

private:

int gradeList[30];

int numStudents;

string name;

};

int main()

{

classGrades intro(5), intermediate;

intro.printlist();

ifstream infile;

infile.open("data.txt");

if (!infile)

{

cout << "Error opening file!" << endl;

exit(1);

}

//set the name of the classGrades object intro to CSC126
intro.setName("CSC126");

//set the name of the object intermediate to CSC211
intermediate.setName("CSC211");

intermediate.setNumStudents(4);

//input the grades for intermediate from a file
intermediate.inputGrades(infile);

//print the intermediate grades

intermediate.printlist();

//print the average of the intermediate grades

cout<<"average: "<<intermediate.returnAvg()<<endl;

// Part II - Syntax for arrays of objects

classGrades allCS[15]; //the default constructor is applied to //all elements of this array

//to set the number of students in each class to 25

int i = 0;
for (i = 0; i < 15; i++)

{

allCS[i].setNumStudents(25);

}

//Assume values in all classes. Write the code to print all class averages?

for (i = 0; i < 15; i++)
{

//note: averages are 0 because there are no grade values assigned to objects in allCS array
cout << "average of class number " << i + 1 << " is " << allCS[i].returnAvg() << endl;

}

  

system("pause");
return 0;
}

void classGrades::printlist() const

{

int i;

cout << "***" << name << "***" << numStudents << endl;

for (i = 0; i < numStudents; i++)

cout << i << ' ' << gradeList[i] << endl;

}

void classGrades::inputGrades(ifstream& in)

{

int i;

for (i = 0; i < numStudents; i++)

in >> gradeList[i];

}

double classGrades::returnAvg() const

{

int i;

double average;

double sum = 0;

//write code to return the average

for (i = 0; i < this->numStudents; i++)
{
sum = sum + this->gradeList[i];
}

average = sum / this->numStudents;

return average;
}

void classGrades::setName(string n)

{

name = n;

}

void classGrades::setNumStudents(int x)

{

numStudents = x;

}

classGrades::classGrades()

{

int i;

name = "";

numStudents = 30;

for (i = 0; i < 30; i++)

gradeList[i] = 0;

}

classGrades::classGrades(int n)

{

int i;

name = "";

numStudents = n;

for (i = 0; i < n; i++)

gradeList[i] = 0;

}
---------------------------