1: //set17.cpp
3: #include <iostream>
4: #include <iomanip>
5: #include <set>
6: using namespace std;
8: int main()
9: {
10: cout << "\nThis program illustrates the comparison of sets using "
11: "the relational operators.";
12: cout << "\nPress Enter to continue ... "; cin.ignore(80, '\n');
14: char a[] = {'A', 'B', 'C', 'D', 'E'};
15: set<char> s1(a, a+4);
16: set<char> s2(a, a+5);
17: set<char> s3(a, a+5);
19: cout << "\nWe begin by creating three sets.";
20: cout << "\nPress Enter to continue ... "; cin.ignore(80, '\n');
22: cout << "\nHere are the values in the first set:\n";
23: set<char>::iterator p = s1.begin();
24: while (p != s1.end()) cout << *p++ << " ";
25: cout << "\nPress Enter to continue ... "; cin.ignore(80, '\n');
27: cout << "\nHere are the values in the second set:\n";
28: p = s2.begin();
29: while (p != s2.end()) cout << *p++ << " ";
30: cout << "\nPress Enter to continue ... "; cin.ignore(80, '\n');
32: cout << "\nThe contents of the third set are the same as the second.";
33: cout << "\nPress Enter to continue ... "; cin.ignore(80, '\n');
35: cout << "\nNow we perform and show the results of some "
36: "set comparisons.";
37: cout << "\nPress Enter to continue ... "; cin.ignore(80, '\n');
39: cout << "\ns1 < s2 = " << boolalpha << (s1 < s2);
40: cout << "\ns1 <= s2 = " << boolalpha << (s1 <= s2);
41: cout << "\ns1 > s2 = " << boolalpha << (s1 > s2);
42: cout << "\ns1 >= s2 = " << boolalpha << (s1 >= s2);
43: cout << "\ns2 == s3 = " << boolalpha << (s2 == s3);
44: cout << "\ns2 != s3 = " << boolalpha << (s2 != s3);
45: cout << "\nPress Enter to continue ... "; cin.ignore(80, '\n');
46: }