vector example

gistfile1.cpp

#include <iostream>
#include <iterator>
#include <vector>
#include <algorithm>
#include <numeric>
#include <string>
using namespace std;

vector<double> getlist()
{
    cout << "Enter values separated by whitespace, EOF to end." << endl;
    return vector<double>((istream_iterator<double>(cin)), istream_iterator<double>());
}

void printlist(const vector<double> &v, const string &message = "Values: ")
{
    cout << message << endl;
    for(size_t i = 0; i < v.size(); ++i)
        cout << i << " " << v[i] << endl;
}
    
double average(const vector<double> &v)
{
    return accumulate(v.begin(), v.end(), 0.) / v.size();
}

int min_index(const vector<double> &v)
{
    return distance(v.begin(), min_element(v.begin(), v.end()));
}

void left_rotate(vector<double> &v)
{
    double front = v.front();
    v.erase(v.begin());
    v.push_back(front);
}

int main()
{
    vector<double> v = getlist();
    if(v.empty()) {
        cout << "You didn't enter anything." << endl;
        return 1;
    }
    printlist(v);
    cout << "Average value: " << average(v) << endl;
    cout << "Index of smallest value: " << min_index(v) << endl;
    left_rotate(v);
    printlist(v, "Values after left rotate:");
}