#include
#include
#include
using namespace std;
void print(const list &lst)
{
list::const_iterator p;
for (p = lst.begin();
p !=lst.end(); ++p)
cout << *p << endl;
cout << endl;
}
int main()
{
double w[4] = { 0.9, 0.8, 88, -99.99 };
list z;
for( int i = 0; i < 4; ++i)
z.push_front(w[i]);
print(z);
z.sort();
print(z);
cout << "sum is "
<< accumulate(z.begin(), z.end(), 0.0)
<< endl;
}