1: //fill_n1a.cpp
3: #include <iostream>
4: #include <vector>
5: #include <algorithm>
6: using namespace std;
8: int main()
9: {
10: cout << "\nThis program illustrates the use of the STL fill_n() "
11: "algorithm\nto set a given number values starting at a given "
12: "location in a\nvector of integers to a given value.";
13: cout << "\nPress Enter to continue ... "; cin.ignore(80, '\n');
15: int a[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
16: vector<int> v(a, a+10);
17: cout << "\nHere are the contents of v:\n";
18: for (vector<int>::size_type i=0; i<v.size(); i++)
19: cout << v.at(i) << " ";
20: cout << "\nPress Enter to continue ... "; cin.ignore(80, '\n');
22: cout << "\nNow we set 5 values of v, starting at the 3rd, to 50.";
23: fill_n(v.begin()+2, 5, 50);
24: cout << "\nHere are the revised contents of v:\n";
25: for (vector<int>::size_type i=0; i<v.size(); i++)
26: cout << v.at(i) << " ";
27: cout << "\nPress Enter to continue ... "; cin.ignore(80, '\n');
29: cout << "\nNow we set the last three values of v to -1.";
30: fill_n(v.begin()+7, 3, -1);
31: cout << "\nHere are the revised contents of v:\n";
32: for (vector<int>::size_type i=0; i<v.size(); i++)
33: cout << v.at(i) << " ";
34: cout << "\nPress Enter to continue ... "; cin.ignore(80, '\n');
36: cout << "\nFinally, we initialize the entire vector to 100.";
37: fill_n(v.begin(), v.size(), 100);
38: cout << "\nHere are the revised contents of v:\n";
39: for (vector<int>::size_type i=0; i<v.size(); i++)
40: cout << v.at(i) << " ";
41: cout << "\nPress Enter to continue ... "; cin.ignore(80, '\n');
42: }