Clear code error

Question

#include <iostream>
using namespace std;
class addition
public :
{
Void add (int a,int b,int c)
{
c=a+b;
}
};
public subtract :public addition;
{
Void sub (int d,int e)
{
e=c-d;
}
};
int main() {
subtn.s;
s.add ;
s.sub;
cout <<"enter the add: ";
cin >>a+b;
cout <<"the value of add "<<c;
cout <<"enter the sub: ";
cin >>d;
cout <<"the value of sub "<<e;
return 0;
}

Answer 1

// Probably you need something like that:
#include <iostream>
using namespace std;

class Addition {
public:
int c;
int add (int a,int b) {
return a+b;
}
};

class Subtract : public Addition {
public:
int sub(int d) {
return c-d;
}
};

int main() {
Subtract s;
int a,b,d;
cout <<"enter the add: ";
cin >> a;
cin >> b;
cout << a << " + " << b << endl;
s.c = s.add(a,b);
cout <<"the value of add "<< s.c << endl;
cout <<"enter the sub: ";
cin >> d;
cout << "you entered sub: " << d << endl;
cout <<"the value of sub "<< s.sub(d) << endl;
return 0;
}

Answer 2

where you denote C

Answer 3

It is a field in class Addition