Question

Does anyone know what i am doing wrong and explain to me why it wouldnt let me declare anything as a circle?
main

int main(void){
...
    circle c;
...
}

circle.h

#include <string>
#include <iostream>
using namespace std;

class circle : public shape {

    double diameter, circum, radius;

public:

    virtual void draw(){
        cout<< "Circle"<< endl;
    }
};

shape.h

#include <string>
#include <iostream>

using namespace std;

class shape{

public:
    virtual void draw() const = 0;
};

Answer 1

virtual void draw() const { 
    cout<< "Circle"<< endl; 
} 

You should add the keyword const like in the example above.