1: //set13.cpp
3: #include <iostream>
4: #include <set>
5: using namespace std;
7: int main()
8: {
9: cout << "\nThis program illustrates the lower_bound() member function "
10: "for sets. The lower\nbound of a value, in a sequence of values in "
11: "ascending order, is the value at\nthe first location where the "
12: "given value could be inserted without destroying\nthe order of "
13: "the sequence. Equivalently, it is the first value in the sequence "
14: "\nthat is >= the given value, if such a value exists; otherwise "
15: "it is the end of\nthe sequence, or the conceptual but non-"
16: "existent \"one-past-the-last\" value.";
17: cout << "\nPress Enter to continue ... "; cin.ignore(80, '\n');
19: int a[] ={2, 4, 6, 8, 10};
20: set<int> s(a, a+5);
22: cout << "\nHere are the values in our set: ";
23: set<int>::iterator p = s.begin();
24: while (p != s.end()) cout << *p++ << " ";
26: set<int>::iterator lower = s.lower_bound(0);
27: if (lower == s.end())
28: cout << "\nThe lower bound of 0 is at the end of the range.";
29: else
30: cout << "\nThe lower bound of 0 is " << *lower << ".";
32: lower = s.lower_bound(2);
33: if (lower == s.end())
34: cout << "\nThe lower bound of 2 is at the end of the range.";
35: else
36: cout << "\nThe lower bound of 2 is " << *lower << ".";
38: lower = s.lower_bound(5);
39: if (lower == s.end())
40: cout << "\nThe lower bound of 5 is at the end of the range.";
41: else
42: cout << "\nThe lower bound of 5 is " << *lower << ".";
44: lower = s.lower_bound(6);
45: if (lower == s.end())
46: cout << "\nThe lower bound of 6 is at the end of the range.";
47: else
48: cout << "\nThe lower bound of 6 is " << *lower << ".";
50: lower = s.lower_bound(10);
51: if (lower == s.end())
52: cout << "\nThe lower bound of 10 is at the end of the range.";
53: else
54: cout << "\nThe lower bound of 10 is " << *lower << ".";
56: lower = s.lower_bound(12);
57: if (lower == s.end())
58: cout << "\nThe lower bound of 12 is at the end of the range.";
59: else
60: cout << "\nThe lower bound of 12 is " << *lower << ".";
61: cout << "\nPress Enter to continue ... "; cin.ignore(80, '\n');
62: }