第15周-閱讀程序（3）

#include <algorithm>
#include <functional>
#include <vector>
#include <iostream>
#include <numeric>
#include <iterator>
using namespace std;
int main()
{
    int a[] = {1,4,7,2,5,8};
    int b[] = {1,2,3,3,2,1};
    const int ASZ = sizeof a / sizeof a[0];
    const int BSZ = sizeof b / sizeof b[0];
    ostream_iterator<int> out(cout,"  ");
    copy(a, a + ASZ, out);
    cout<<endl;
    copy(b, b + BSZ, out);
    cout<<endl;
    int r = accumulate(a, a + ASZ, 0);
    cout << "accumulate 1: " << r << endl;
    // Should produce the same result:
    r = accumulate(b, b + BSZ, 0, plus<int>());
    cout << "accumulate 2: " << r << endl;
    r = inner_product(a, a + ASZ, b, 0);
    // 或  r = inner_product(a, a + ASZ, b, 0, plus<int>(), multiplies<int>());
    cout << "inner_product : " << r << endl;
    int* it = partial_sum(a, a + ASZ, b);
    // 或 int* it = partial_sum(a, a + ASZ, b, plus<int>());
    copy(b, it, out);
    cout<<endl;
    it = adjacent_difference(a, a + ASZ, b);
    // 或 it = adjacent_difference(a, a + ASZ, b, minus<int>());
    copy(b, it, out);
    cout<<endl;
    return 0;
}

運行結果：