Question

Cout_op.hpp

#include <ostream>
#include <string>
#pragma once
#ifndef STUDENT_CPP
#define STUDENT_CPP
#includes "Student.cpp"
#endif

//This allows us to << a Student object
template<class CharT, class TraitsT>
std::basic_ostream<CharT, TraitsT>&
operator <<(std::basic_ostream<CharT, TraitsT>& os, Student& sc)
{
   return os << sc.toString();
}
class Student
{
private:
//declaring private variables
struct Student () {
string name;
int age;
char gender;
double gpa;
bool onScholarship};
public:
//creating two constructors prototype
Student(); //empty constructor
Student(string,int,char,double,bool);//parameterised constructor

//declaring prototype of 6 methods
int getAge();
void setGPA(double);
void setOnScholarship(bool);
string toString();
bool onProbation();
string complain();
};
Student.cpp

/* File: Student.cpp
* Name: ************
* Date: MM/DD/YYYY
* Purpose: Show your understanding of classes
*/
#include <iostream>
#include <string>

using namespace std;

class Student
//empty constructor
Student::Student(){

}
//parameterised constructor
Student::Student(string name,int age,char gender,double gpa,bool onScholarship){
Student::Student name=name;
Student::Student age=age;
Student::Student gender=gender;
Student::Student gpa=gpa;
Student::Student onScholarship=onScholarship;

}
//returning age
int Student::getAge(){
return age;
}
//setting GPA
void Student::setGPA(double gpa){
this->gpa=gpa;
}
//Setting onScholarship
void Student::setOnScholarship(bool onScholarship){
this->onScholarship=onScholarship;
}
//creating fomatted string
string Student::toString(){
return (name + "\t" + to_string(age) +"\t" +gender+"\t"+std::to_string(gpa)+"\t"+std::to_string(onScholarship));
}
//method to check whether is probation
bool Student::onProbation(){
if(onScholarship && gpa<2)
return true;
else
return false;
}
//Method to return complain
string Student::complain(){
return "I have complain about toilets";
}

StudentDriver.cpp

#include <iostream>
#include <ostream>
#include <string>
#includes Student.cpp
#include "Cout_op.hpp" //includes Student.cpp

using namespace std;

// This will be the "driver" class for the Student class created in
// MinilabWritingClasses (It looks very complicated because of all
// the comments, but it really just creates instances of Student and
// tells them to do things...)

int main()
{
   //create an instance of Student
   cout << "***** Creating a Student, uninitialized data from default constructor\n";
   Student stud1; //calls default constructor

   //print it so we can see what the default values were for the class data
   //note that its toString() will be called automatically
   cout << "\n***** printing it - notice the uninitialized values\n";
   cout << stud1 << endl;

   //create another instance of a Student, passing in initial values to its constructor
   cout << "\n***** Creating another Student, passing initial values to its constructor\n";
   Student msBoss = Student("Bill Gates", 57, 'm', 3.2, true);

   //tell it to return its age
   cout << "\n***** telling it to return its age.\n";
   int theAge = msBoss.getAge();
   cout << "Its age is: " << theAge << endl;

   //print it - note that its toString() will be called automatically;
   cout << "\n***** printing it - see if values are correct\n";
   cout << msBoss << endl;

   //ask it if it is on probation
   cout << "\n***** asking it if it is on probation (check answer)\n";
   cout << "onProbation() returned: " << msBoss.onProbation() << endl;

   //tell it to change its gpa to 1.3
   cout << "\n***** telling it to change its gpa to 1.3\n";
   msBoss.setGPA(1.3);

   //print it now
   cout << "\n***** printing it - see if the values are correct\n";
   cout << msBoss << endl;

   //ask it if it is on probation now
   cout << "\n***** asking it if it is on probation (check answer)\n";
   cout << "onProbation() returned: " << msBoss.onProbation() << endl;

   //tell it to complain
   cout << "\n***** telling it to complain\n";
   cout << "complain() returned: " << msBoss.complain() << endl;

   //tell it to change its onScholarship field to false
   cout << "\n***** telling it to change its onScholarship field to false\n";
   msBoss.setOnScholarship(false);

   //print it now
   cout << "\n***** printing it - see if the values are correct\n";
   cout << msBoss << endl;

   //ask it if it is on probation now
   cout << "\n***** asking it if it is on probation (check answer)\n";
   cout << "onProbation() returned: " << msBoss.onProbation() << endl;

   //create a different student, tell it to have some different values, and tell it to print itself
   cout << "\n***** creating a different Student, passing initial values to its constructor/n";
   Student stud2;
   stud2 = Student("Hillary Clinton", 59, 'f', 2.0, true);        //notice-can define variable and create it in 2 steps

   //print it
   cout << "\n***** printing it - see if the values are correct\n";
   cout << stud2 << endl;

   //ask it if it is on probation now
   cout << "\n***** asking it if it is on probation (check answer)\n";
   cout << "onProbation() returned: " << stud2.onProbation() << endl;

   cin.get(); cin.get();
   return 0;

}//end main()

I am having an issue running this code on CodeBlocker for c++ class. can you please tell me what the problem is? thank you

Answer 1

There was a few problems with your code:-

1. There was problem with your structure declaration in student.cpp code

2. The student class created by you should be in student.cpp class not in cout_op.hpp

3. changing all the variables with correspong ding correct structure declaration.

I have corrected the codes and these work fine as tested on code blocks screenshot attached:

**********************

Cout_op.hpp

*************************

#include <ostream>
#include <string>
#pragma once
#ifndef STUDENT_CPP
#define STUDENT_CPP
#include "Student.cpp"
#endif
//This allows us to << a Student object
template<class CharT, class TraitsT>
std::basic_ostream<CharT, TraitsT>&
operator <<(std::basic_ostream<CharT, TraitsT>& os, Student& sc)
{
return os << sc.toString();
}

************************************************

Student.cpp

***********************************************

/* File: Student.cpp
* Name: ************
* Date: MM/DD/YYYY
* Purpose: Show your understanding of classes
*/
#include <iostream>
#include <string>
using namespace std;
class Student
{
private:
//declaring private variables
/* changed structure declaration */

struct Student_data {
string name;
int age;
char gender;
double gpa;
bool onScholarship;
}s;
/***********************/
public:
//creating two constructors prototype
Student(); //empty constructor
Student(string,int,char,double,bool);//parameterised constructor
//declaring prototype of 6 methods
int getAge();
void setGPA(double);
void setOnScholarship(bool);
string toString();
bool onProbation();
string complain();
};
//empty constructor
Student::Student(){
}
//parameterised constructor
Student::Student(string name,int age,char gender,double gpa,bool onScholarship){
Student::s.name=name;
Student::s.age=age;
Student::s.gender=gender;
Student::s.gpa=gpa;
Student::s.onScholarship=onScholarship;
}
//returning age
int Student::getAge(){
return s.age;
}
//setting GPA
void Student::setGPA(double gpa){
this->s.gpa=gpa;
}
//Setting onScholarship
void Student::setOnScholarship(bool onScholarship){
this->s.onScholarship=onScholarship;
}
//creating fomatted string
string Student::toString(){
return (s.name + "\t" + to_string(s.age) +"\t" +s.gender+"\t"+std::to_string(s.gpa)+"\t"+std::to_string(s.onScholarship));
}
//method to check whether is probation
bool Student::onProbation(){
if(s.onScholarship && s.gpa<2)
return true;
else
return false;
}
//Method to return complain
string Student::complain(){
return "I have complain about toilets";
}

**************************************************************

StudentDriver.cpp

**************************************************************

#include <iostream>
#include <ostream>
#include <string>
//#includes Student.cpp
#include "Cout_op.hpp" //includes Student.cpp
using namespace std;
// This will be the "driver" class for the Student class created in
// MinilabWritingClasses (It looks very complicated because of all
// the comments, but it really just creates instances of Student and
// tells them to do things...)
int main()
{
//create an instance of Student
cout << "***** Creating a Student, uninitialized data from default constructor\n";
Student stud1; //calls default constructor
//print it so we can see what the default values were for the class data
//note that its toString() will be called automatically
cout << "\n***** printing it - notice the uninitialized values\n";
cout << stud1 << endl;
//create another instance of a Student, passing in initial values to its constructor
cout << "\n***** Creating another Student, passing initial values to its constructor\n";
Student msBoss = Student("Bill Gates", 57, 'm', 3.2, true);
//tell it to return its age
cout << "\n***** telling it to return its age.\n";
int theAge = msBoss.getAge();
cout << "Its age is: " << theAge << endl;
//print it - note that its toString() will be called automatically;
cout << "\n***** printing it - see if values are correct\n";
cout << msBoss << endl;
//ask it if it is on probation
cout << "\n***** asking it if it is on probation (check answer)\n";
cout << "onProbation() returned: " << msBoss.onProbation() << endl;
//tell it to change its gpa to 1.3
cout << "\n***** telling it to change its gpa to 1.3\n";
msBoss.setGPA(1.3);
//print it now
cout << "\n***** printing it - see if the values are correct\n";
cout << msBoss << endl;
//ask it if it is on probation now
cout << "\n***** asking it if it is on probation (check answer)\n";
cout << "onProbation() returned: " << msBoss.onProbation() << endl;
//tell it to complain
cout << "\n***** telling it to complain\n";
cout << "complain() returned: " << msBoss.complain() << endl;
//tell it to change its onScholarship field to false
cout << "\n***** telling it to change its onScholarship field to false\n";
msBoss.setOnScholarship(false);
//print it now
cout << "\n***** printing it - see if the values are correct\n";
cout << msBoss << endl;
//ask it if it is on probation now
cout << "\n***** asking it if it is on probation (check answer)\n";
cout << "onProbation() returned: " << msBoss.onProbation() << endl;
//create a different student, tell it to have some different values, and tell it to print itself
cout << "\n***** creating a different Student, passing initial values to its constructor/n";
Student stud2;
stud2 = Student("Hillary Clinton", 59, 'f', 2.0, true); //notice-can define variable and create it in 2 steps
//print it
cout << "\n***** printing it - see if the values are correct\n";
cout << stud2 << endl;
//ask it if it is on probation now
cout << "\n***** asking it if it is on probation (check answer)\n";
cout << "onProbation() returned: " << stud2.onProbation() << endl;
cin.get(); cin.get();
return 0;
}//end main()
**********************************************************************