C++,STL 045(24.10.24)
内容
1.对set容器的大小进行操作。
2.set容器的交换操作。
运行代码
#include <iostream>
#include <set>using namespace std;void printSet(set<int> &s)
{for (set<int>::iterator it = s.begin(); it != s.end(); it++){cout << *it << " ";}cout << endl;
}void test01()
{set<int> s1;s1.insert(30);s1.insert(10);s1.insert(40);s1.insert(20);if (s1.empty()) // here{cout << "容器为空" << endl;}else{cout << "容器不为空" << endl;cout << "容器的大小:" << s1.size() << endl; // here}
}void test02()
{set<int> s2;s2.insert(20);s2.insert(30);s2.insert(40);s2.insert(10);set<int> s3;s3.insert(2);s3.insert(3);s3.insert(1);cout << "交换前:" << endl;cout << "s1;";printSet(s2);cout << "s2:";printSet(s3);s2.swap(s3); // herecout << "交换后:" << endl;cout << "s1;";printSet(s2);cout << "s2:";printSet(s3);
}int main()
{test01();cout << endl;test02();return 0;
}