此函数用于检查第一个集合是否大于其他集合。
template <class T, class Compare, class Alloc> bool operator> ( const set<T,Compare,Alloc>& lhs, const set<T,Compare,Alloc>& rhs );
lhs : 第一个设置的对象。
rhs : 第二组对象。
如果集合集合对象的左侧大于集合对象的右侧,则返回true,否则返回false。
让我们看一个简单的示例,检查第一个集合是否大于:
#include <iostream> #include <set> using namespace std; int main() { set<char> m1; set<char> m2; m1.emplace('a'); if (m1 > m2) cout << "Set m1 is greater than m2." << endl; m1 = m2; if (!(m1 > m2)) cout << "Set m1 is not greater than m2." << endl; return 0; }
输出:
Set m1 is greater than m2. Set m1 is not greater than m2.
在上面的示例中,有两组m1和m2。 m1包含一个元素,m2为空。当我们比较两个集合时,它将显示消息"集合m1大于m2",并且在将m2分配给m1之后,两个集合具有相等的元素,然后它将显示消息"集合m1不大于m2"。
让我们看一个简单的例子:
#include <set> #include <iostream> using namespace std; int main( ) { set < int> m1, m2, m3; int i; for ( i = 0 ; i < 3 ; i++ ) { m1.insert ( i ); m2.insert (i * i ); m3.insert (i - 1 ); } if ( m1 > m2 ) cout << "The set m1 is greater than the set m2." << endl; else cout << "The set m1 is not greater than the set m2." << endl; if ( m1 > m3 ) cout << "The set m1 is greater than the set m3." << endl; else cout << "The set m1 is not greater than the set m3." << endl; return 0; }
输出:
The set m1 is not greater than the set m2. The set m1 is greater than the set m3.
让我们看一个简单的例子:
#include <iostream> #include <set> using namespace std; int main () { set < int > s1 , s2 ; s1 . insert ( 10 ); s1 . insert ( 20 ); s1 . insert ( 30 ); s2 = s1 ; cout << ( s1 > s2 ) << endl ; s1 . insert ( 40 ); cout << ( s1 > s2 ) << endl ; }
输出:
0 1
在上面的示例中,如果s1大于s2,则它将返回1,否则返回0。
#include <set> #include <iostream> using namespace std; int main () { set<string> m2; typedef set<string> login; m2 = {"xyz@123"} ; //stored id and password string password; login m1; cout<<"---------Login----------"<<endl<<endl; cout<<"Enter password: \n"; cin>> password; //Get value m1.insert(password); //Put them in set cout<<"Password you have entered: \n"; for (auto it = m1.begin(); it != m1.end(); it++) { cout << (*it)<< endl; } cout<<"Password stored in the system :\n"; for (auto it = m2.begin(); it != m2.end(); it++) { cout << (*it)<< endl; } if (m2 > m1) cout << "\nIncorrect Password..." << endl; else cout << "\nWelcome to your Page..." << endl; return 0; }
输出:
1). ---------Login---------- Enter password: xyz@123 Password you have entered: xyz@123 Password stored in the system : xyz@123 Welcome to your Page... 2). ---------Login--------- Enter password: abc@123 Password you have entered: abc@123 Password stored in the system: xyz@123 Incorrect Password...
在上面的示例中,有两组m1和m2。 m1包含存储的密码,第二组m2存储用户输入的密码。它检查m2是否大于m1。如果密码m2不大于m1,则登录成功,否则登录失败。
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