class error

hi im getting an error while compiling this


testgrade.cpp

Code:

#include <iostream>
#include <string>

using namespace std;

#include "grade.h"

int main()
{
	GradeBook grade1("CS101	Introduction to Programming in C++", "Manzoor Ahmed");
	GradeBook grade2("CS102 C++ Data Structures", "Manzoor Ahmed");

    cout << grade1.displayMessage();
    cout << grade2.displayMessage();

    return 0;

}

grade.cpp

Code:

#include <iostream>
#include <string>
#include "grade.h"

using namespace std;

GradeBook::GradeBook(string name, string instName) // constructor
	{
		setCourseName(name);
		setInstrName(instName);
	}

void GradeBook::setCourseName(string setName)
	{
		if (setName.length() <= 25 )
		{
			courseName = setName; // set courseName
		}

		else {
			courseName = setName.substr(0,25);

			cout << "Name \"" << setName << "\" exceeds maximum length (25).\n"
				<< "Limiting course name to first 25 characters.\n" << endl;
		}
	}

string GradeBook::getCourseName()
	{
		return courseName;
	}

void GradeBook::setInstrName(string instName)
	{
		instrName = instName; // set instructor name
	}

string GradeBook::getInstrName()
	{
		return instrName;
	}

void GradeBook::displayMessage()
	{
		cout << "Welcome to the grade book for\n" << getCourseName() << endl;
		cout << "This course is presented by: " << getInstrName() << endl;
	}

grade.h

Code:

#include <iostream>
#include <string>

using namespace std;

class GradeBook
{
	public:
		GradeBook(string name, string instName); // constructor
		void setCourseName(string setName); // set function for course Name
		string getCourseName(); // get function for course Name
		void setInstrName(string instName); // set function for instructor name
		string getInstrName(); // get function for instructor name
		void displayMessage(); // display course name function
	private:
		string courseName;
		string instrName; // variable that stores course instructor name
}; // class GradeBook end

what am i doing wrong ?

i get this error

13: error: no match for 'operator<<' in 'std::cout <<
(&grade1)->GradeBook::displayMessage()'

You don't need to the the std::cout in your main.

what do you mean ???

ok when I try to run this then it works fine

like

Code:

cout << grade1.getCourseName();

but when I type displayMessage() instead of getCourseName()

i cant compile then

Because getCourseName returns a string and displayMessage returns nothing. How is std::cout supposed to output void? The displayMessage function already calls those functions with std::cout.

hey thanks,

that was very easy but hell very difficult to spot

You are welcome.

Chapter 59. Don't write namespace usings in a header file or before an #include