Another Scope Example
void one(void)
{
   int a = 10;
   cout << " a = " << a << endl;
}
void two (void)
{
   int a = 0;
   one( );
   cout << " a = " << a << endl;
}

int main (void)        a = 20
{
   int a = 20;
   two( );
}