adj_diff.cpp

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#include <numeric>       // for adjacent_difference
#include <vector>        // for vector
#include <iostream>      // for cout
#include <iterator>      // for ostream_iterator
#include <functional>    // for multiplies
 
#include <examples.h>
 
 
int main ()
{
    // Typedefs for convenience.
    typedef std::vector<long, std::allocator<long> > Vector;
 
    typedef std::ostream_iterator <Vector::value_type,
                                   char,
                                   std::char_traits<char> > os_iter;
 
    // Initialize a Vector of ints from an array.
    const Vector::value_type arr [] = {
        1, 1, 2, 3, 5, 8, 13, 21, 34, 55
    };
 
    Vector v (arr + 0, arr + sizeof arr / sizeof *arr);
 
    // Two vectors initialized to all zeros for storing results.
    Vector diffs (v.size ()),
           prods (v.size ());
 
    // Calculate difference(s) using default operator (minus).
    std::adjacent_difference (v.begin (), v.end (), diffs.begin ());
 
    // Calculate difference (s) using the times operator.
    std::adjacent_difference (v.begin (), v.end (), prods.begin (),
                              std::multiplies<Vector::value_type> ());
 
    // Create an ostream_iterator object (for convenience).
    os_iter osit (std::cout, " ");
 
    // Output the results.
    std::cout << "For the vector: " << std::endl << "     ";
    std::copy (v.begin (), v.end (), osit);
 
    std::cout << std::endl << std::endl;
 
    std::cout << "The differences between adjacent elements are: "
              << std::endl << "    ";
 
    std::copy (diffs.begin (), diffs.end (), osit);
    std::cout << std::endl << std::endl;
 
    std::cout << "The products of adjacent elements are: "
              << std::endl << "     ";
 
    std::copy (prods.begin (), prods.end (), osit);
    std::cout << std::endl;
 
    return 0;
}