CPP Program Does Not Run

Question

I'm new to C++ and I have written an example in CodeBlocks to see how this program works. Here is the program:

 #include <iostream>
#include <string>

using std::cout;
using std::cin;
using std::endl;
using std::string;

class GradeBook
{
    public:
        GradeBook( string name )
        {
            setCourseName( name );
        }
        void setCourseName( string name )
        {
            courseName = name;
        }
        string getCourseName()
        {
            return courseName;
        }
        void displayMessage()
        {
            cout << "Welcome to the gradebook for \n" << getCourseName() << "!" << endl;
        }
    private:
        string courseName;
};

int main()
{
    GradeBook gradeBook1("Introduction to C++");
    cout << gradeBook1.displayMessage() << endl;
    return 0;

}

And as you can see I have called a displayMessage function at main and it basically should print out a statement based on the argument that I have called ealier in gradeBook1 object.

But the problem is, it does not start and I don't know why!

And here is the error log:

  ||=== Build: Debug in Youtube (compiler: GNU GCC Compiler) ===|
C:\Users\Pouya\Desktop\C++_Tutorials\Youtube\main.cpp||In function 'int main()':|
C:\Users\Pouya\Desktop\C++_Tutorials\Youtube\main.cpp|35|error: no match for 'operator<<' (operand types are 'std::ostream {aka std::basic_ostream<char>}' and 'void')|

Here's your problem: cout << gradeBook1.displayMessage() << endl; and you are calling void displayMessage(). Just invoke gradeBook1.displayMessage(); then it will work — Asesh
– Asesh, Commented Oct 29, 2017 at 7:18

jbsu32 · Accepted Answer · 2017-10-29 07:21:51Z

1

gradeBook1.displayMessage() is a void function. Nothing to print in this line ->

cout << gradeBook1.displayMessage() << endl;

remove cout. Just type ->

gradeBook1.displayMessage();

Hope it helps. :)

answered Oct 29, 2017 at 7:21

jbsu32

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