I am unable to use a class variable as a default argument for the same class's function

Question

I am well aware that line 7 is invalid . but I want to use the class variables as default argument to method(apple) .

class trial{

public:

int i=10 ;

    void apple(int i=this.i){
       cout<<i<<endl;
    }

    void display(){
         cout<<i<<endl;
    }
};

Answer 1

Replace

void apple(int i=this.i){
     cout<<i<<endl;
}

… with

void apple(int i){
     cout<<i<<endl;
}

void apple(){
     apple(i);
}

You can't access member variables in the formal argument list of a function.