Whats wrong in this program? How to fix the code to get output 10

Question

#include<iostream>
using namespace std;
class base
{
public: int a=10;
};

class child: public base
{
public: a=20;
child(){cout<<a;}
};

int main()
{
child o;
return 0;
}

Answer 1

#include<iostream>
using namespace std;
class base {
public:
int a=10;
};

class child: base {
public:
// int a=20; // This creates a class variable for the child class. you must still declare its type (int)
child() {
//a=20; //if the variable above doesn't exist then this will access the a from the base class and set its value to 20
cout<<a; // This will output the value of a
// if both lines above are commented out it will output 10 from the base class
}
};

int main()
{
child o;
return 0;
}

Answer 2

thanks

Answer 3

it's executing an showing out put 20

Answer 4

the main thing is to declare it data type