undefined reference to `rectangle::rectangle()

Question

I'm trying to declare an object of type rectangle but it keeps showing me this error

this is the rectangle class which inherits from shape class:

class rectangle: public shape{

int width, height;
public:
    rectangle();

 void draw(int width, int height){
    for(int i = 1; i <= height; i++){
            for(int j = 1; j <= width; j++){
                if( i == 1 && i == height)
                    cout<<"*";
                else if( j == 1 && j == width)
                    cout<<"*";
                else
                    cout<<" ";
            }
            cout<<endl;
        }
    }


};

this is the shape class:

class shape
{
int x, y;
char letter;
public:
    shape(int x, int y, char letter, int length){
        int X = x;
        int Y = y;
        int L = letter;
    }
    void verLine(){
        for(int i = 0; i < 5; i++){
            cout<<"*"<<endl;
        }
    }
    void horLine(){
        for(int i = 0; i < 5; i++){
            cout<<"*";
        }
    }
    char setLetter(char letter){
        int newLetter = letter;
        return newLetter;
    }
    void gotoxy(int x, int y){
        HANDLE hConsole;
        COORD cursorLoe;
        std::cout.flush();
        cursorLoe.X = x;
        cursorLoe.Y = y;
        hConsole = GetStdHandle(STD_OUTPUT_HANDLE);
        SetConsoleCursorPosition(hConsole, cursorLoe);
    }
};

and this is the main:

 int main()
 {
     rectangle r1;
     cout<<endl;
     r1.draw(5,5);
     return 0;
 }

I think the problem is with the default constructor I have in the rectangle class, but I din't find any other way to code it

You don't seem to have defined the default constructor for rectangle. — , Jun 07 '17 at 19:47

score 1 · Accepted Answer · answered Jun 07 '17 at 19:48

1

You declared the default constructor but didn't define it. You need to define the function rectangle::rectangle() somewhere. If you don't need the constructor to actually do anything, then you don't need to declare it at all. So either define the constructor or don't declare it.

answered Jun 07 '17 at 19:48

Blue Goose

137
5

when I deleted it I got this error: use of deleted function 'rectangle::rectangle()' – Haïthem Saoudi Jun 07 '17 at 19:49
@HaïthemSaoudi That's because `shape` doesn't have a default Constructor. Either give `shape` a default constructor, or explicitly define `rectangle()` to call `shape(int, int, char, int)` in its member initialization list. – Xirema Jun 07 '17 at 19:52
you need have an initializer list http://en.cppreference.com/w/cpp/language/initializer_list – Manvir Jun 07 '17 at 19:53
@Tyger I just declared a default constructor for shape but i still get the error undefined reference for shape::shape() – Haïthem Saoudi Jun 07 '17 at 20:02
@HaïthemSaoudi It worked for me [here](http://cpp.sh/8smrz) – Manvir Jun 07 '17 at 20:08
@HaïthemSaoudi did it work or are you still getting an error? – Manvir Jun 07 '17 at 20:13

undefined reference to `rectangle::rectangle()

1 Answers1