example_13_22.cpp

data+structures+using+c的源码

//Numeric algorithms accumulate and adjacent_difference

#include <iostream>
#include <algorithm>
#include <numeric>
#include <iterator>
#include <vector>
#include <functional>

using namespace std;

void print(vector<int> vList);

int main()
{
    int list[8] = {1, 2, 3, 4, 5, 6, 7, 8};          //Line 1

    vector<int> vecList(list, list + 8);             //Line 2
    vector<int> newVList(8);                         //Line 3

    cout<<"Line 4: vecList: ";                       //Line 4
    print(vecList);                                  //Line 5

        //accumulate
    int sum = accumulate(vecList.begin(), 
                         vecList.end(), 0);          //Line 6

    cout<<"Line 7: Sum of the elements of vecList = "
        <<sum<<endl;                                 //Line 7

    int product = accumulate(vecList.begin(), 
                             vecList.end(), 
                             1, multiplies<int>());  //Line 8

    cout<<"Line 9: Product of the elements of "
        <<"vecList = "<<product<<endl;               //Line 9

        //adjacent_difference 
    adjacent_difference(vecList.begin(), 
                        vecList.end(), 
                        newVList.begin());           //Line 10

    cout<<"Line 11: newVList: ";                     //Line 11
    print(newVList);                                 //Line 12

    adjacent_difference(vecList.begin(), vecList.end(), 
                        newVList.begin(), 
                        multiplies<int>());          //Line 13	
 
    cout<<"Line 14: newVList: ";                     //Line 14
    print(newVList);                                 //Line 15

    return 0;
}

void print(vector<int> vList)
{
     ostream_iterator<int> screenOut(cout, " ");     //Line 16

     copy(vList.begin(), vList.end(), screenOut);    //Line 17
     cout<<endl;                                     //Line 18
}