Whats wrong with foo(function)

Question

#include <iostream>
using namespace std;
class my{
private:
int data;

public:

my(int value)
{
data=value;
cout<<data<<"constructor"<<endl;
}
~my()
{
cout<<data<<"destructor"<<endl;
}

void foo()
{
cout<<"foo has been started" <<endl;
my a(1);
cout<<"foo has been finished"<<endl;
}
};

int main() {
foo();
return 0;
}
Whats wrong with foo?
https://code.sololearn.com/cVIwXli24M5K/?ref=app

Answer 1

You need to create an instance of the class, in this example, it's ...'obj':
int main() {
my obj(49);
obj.foo();
return 0;
}