accumulate.cpp

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#include <numeric>    // for accumulate
#include <vector>     // for vector
#include <functional> // for multiplies
#include <iostream>   // for cout
 
#include <examples.h>
 
int main ()
{
    // Typedef for convenience.
    typedef std::vector<int, std::allocator<int> > Vector;
 
    // Initialize a vector using an array of integers.
    const Vector::value_type arr[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
    Vector v1 (arr, arr + sizeof arr / sizeof *arr);
 
    // Accumulate sums and products.
    Vector::value_type sum =
        std::accumulate (v1.begin (), v1.end (), 0);
 
    Vector::value_type prod =
        std::accumulate (v1.begin (), v1.end (), 1,
                         std::multiplies<Vector::value_type>());
 
    // Output the results.
    std::cout << "For the series: ";
    for (Vector::iterator i = v1.begin (); i != v1.end (); ++i)
        std::cout << *i << " ";
 
    std::cout << "where N = " << v1.size ()
              << "\nThe sum = (N * N + N) / 2 = " << sum
              << "\nThe product = N! = " << prod << std::endl;
 
    return 0;
}