Error: expected a declaration ......... and '{' : missing function header (old-style formal list?)

Question

I trying to create a DLL with this code but in line 7, I am getting this two errors "E0169 - expected a declaration" and "C2447 - '{' : missing function header (old-style formal list?)"

Answer 1

You left a ; after your class name.

Also you should put : after public for your function definition.

Also, if you try to define a function within your class, the syntax should be as follows :

class className
{
    int attribute;

    public : void foo(){
        cout << "Value of attribute is " << attribute << endl;
    }
};

That is to say without a ; and with the { after the parenthesis.

I suggest you take a look at this link to understand how to properly create a class.

Answer 2

1, When you create a class, you couldn't need the ; after the GDT_dll.

class GDT_dll
{
……
}

2, You need the :after public.

3, You couldn't name the function to "main", because the main function has a special meaning.

4, Finally, you need a ";"after the last "}"

Here is the code:

#include"pch.h"
#include <stdio.h>
#include <iostream>
#include <string>
#include <conio.h>
using namespace std;
class GDT_dll
{
    public : void foo()
    {
    string name, firstName;
    int birthDate, birthMonth, birthYear;

        cout << "Enter Name: ";
        cin >> name;
        cout << "Enter First Name: ";
        cin >> firstName;
        cout << "Enter Birth Date: ";
        cin >> birthDate;
        cout << "Enter Birth Month: ";
        cin >> birthMonth;
        cout << "Enter Birth Year: ";
        cin >> birthYear;
    }
};

If you want to create a DLL, I suggest you could refer to the Doc: Walkthrough: Create and use your own Dynamic Link Library