error Cal(int, int) in Cal cannot be applied to ()

[eruditionist]

Hi I get this error Cal(int, int) in Cal cannot be applied to ()
No idea whats going on.



class Cal{
private int base;
private int height;
private int total;

public Cal(int b,int h){
base=b;
height=h;
}
public void setHeight(int num){
height=num;
}
public void setBase(int num){
base=num;
}
public void getTotal(){
System.out.println("Area of a Rectangle is " +base*height);
}
}

//====================================================
class Cal2 extends Cal{
private int radius;
private int total2;


Cal2(int r){
radius = r;
}
public void setRadius(int num){
radius=num;
}
public void getTotal2(){
System.out.println("Area of a circle is " +3.14*radius*radius);
}
}

//=================================================
public class Inheritance4{
public static void main (String[] args){

Cal areaRectangle =new Cal(3,4);
Cal2 areaCircle =new Cal2(4);
areaRectangle.getTotal();

}
}

[graviton]

quiet easy:
when you activate the constuctor of Cal2, it implicitly tries to call the Constructor of Cal. Since you didn't define it otherwise, that's the default constructor with no parameters, and this one doesn't exist.
you will have to either
provide a default constructor for Cal like

public Cal(){}

or write a constructor for Cal2 like this:

Cal2(int r, int b,int h){
super(b,h);
radius = r;
}

[eruditionist]

Thanks alot that worked