#include
#include
using namespace std;
void show(const char *msg, vector vect);
int main() {
// Declare a vector that has an initial capacity of 10.
vector v(10);
for(unsigned i=0; i < v.size(); ++i) v[i] = i*i;
show("Contents of v: ", v);
// the use of the subscripting operator.
int sum = 0;
for(unsigned i=0; i < v.size(); ++i) sum += v[i];
double avg = sum / v.size();
cout << "The average of the elements is " << avg << "\n\n";
// Add elements to the end of v.
v.push_back(100);
v.push_back(121);
cout << "The first and last element in v as"
<< " pointed to by rbegin() and rend()-1:\n"
<< *v.rbegin() << ", " << *(v.rend()-1) << "\n\n";
return 0;
}
void show(const char *msg, vector vect) {
cout << msg << endl;
for(unsigned i=0; i < vect.size(); ++i)
cout << vect[i] << endl;
}