1: //accumulate1a.cpp
3: #include <iostream>
4: #include <vector>
5: #include <numeric>
6: using namespace std;
8: int main()
9: {
10: cout << "\nThis program illustrates the use of the STL accumulate() "
11: "algorithm (default\nversion) from <numeric> to find the sum of "
12: "integer values stored in a vector.";
13: cout << "\nPress Enter to continue ... "; cin.ignore(80, '\n');
15: int a[] = {2, 4, 6, 8, 10};
16: vector<int> v(a, a+5);
18: cout << "\nHere are the integer values in the vector:\n";
19: for (vector<int>::size_type i=0; i<v.size(); i++)
20: cout << v.at(i) << " ";
21: cout << "\nPress Enter to continue ... "; cin.ignore(80, '\n');
23: cout << "\nThe sum of these values is "
24: << accumulate(v.begin(), v.end(), 0) << ".";
25: cout << "\nPress Enter to continue ... "; cin.ignore(80, '\n');
27: cout << "\nThe sum of the middle three values and an intial "
28: "value of -5 is "
29: << accumulate(v.begin()+1, v.end()-1, -5) << ".";
30: cout << "\nPress Enter to continue ... "; cin.ignore(80, '\n');
32: cout << "\nThe sum of the values in an empty range, with "
33: "an intial value of 22, is "
34: << accumulate(v.begin(), v.begin(), 22) << ".";
35: cout << "\nPress Enter to continue ... "; cin.ignore(80, '\n');
36: }