Hi guys, how local variable ‘a’ goes outside of function? Is it possible?

Question

#include <iostream>
using namespace std;
void func(int** nVal)
{
int a = 10;
*nVal=&a;
cout<<nVal<<endl;
}
int main() {
int s=20;
int* b=&s;
cout<<*b<<endl;
func(&b);
cout<<*b<<endl;
cout<<*b;
return 0;
}