Detailed description of the set function in STL

Insert the set element:

# Include <iostream>
# Include <string>
# Include <set>
Using namespace std;
Void printSet (set <int> s)
{
// Copy (s. begin (), s. end (), ostream_iterator <int> (cout ,","));
Int I;
For (I = s. begin (); I> = s. end (); I ++)
 
Cout <endl;
}
Void main ()
{
// Create an empty set object. The element type is int,
Set <int> s1;
For (int I = 0; I <5; I ++)
S1.insert (I * 10 );
PrintSet (s1 );
Cout <"s1.insert (20). second =" <endl ;;
If (s1.insert (20). second) // insert 20 again
Cout <"Insert OK! "<Endl;
Else
Cout <"Insert Failed! "<Endl;
Cout <"s1.insert (50). second =" <endl;
If (s1.insert (50). second)
{Cout <"Insert OK! "<Endl; printSet (s1 );}
Else
Cout <"Insert Failed! "<Endl;
Pair <set <int >:: iterator, bool> p;
P = s1.insert (60 );
If (p. second)
{Cout <"Insert OK! "<Endl; printSet (s1 );}
Else
Cout <"Insert Failed! "<Endl;
}