CareerCup

#include <iostream>
#include <vector>
#include <iterator>
#include <algorithm>
#include <functional>

struct base
{
int val ;
base() : val(100) {}
virtual int foo() { return val ; }
} ;

struct derived : public base
{
double val ;
derived() : val(200.2) {}
virtual int foo() { return val ; }
} ;

int main()
{
std::vector<base*> vec( 3 ) ;
derived derived ;
std::fill( vec.begin(), vec.end(), &derived ) ;
std::transform( vec.begin(), vec.end(),
std::ostream_iterator<int>( std::cout, "+" ),
std::mem_fun( &base::foo ) ) ;
return 0;
}

what will be the output of the code above