STL Collection set--First Dictionary of Andy (pick)

Set is a mathematical set--each element appears at most once, and as in sort, the custom type can also construct set, but it must also define the "less than" operator

(PS: Multiset is a collection of data that is allowed to be duplicated)

Set does not support random access and must be accessed using an iterator.

Begin () returns the iterator that points to the first element
Clear () Clears all elements
COUNT () returns the number of elements of a value
Empty () returns True (True) if the collection is empty
End () returns an iterator that points after the last element, not the last element
Erase () Delete elements in the collection
Find () returns an iterator that points to the element being found
Insert () Inserts an element into the collection
Max_size () returns the maximum limit of the elements that the collection can hold
The number of elements in the size () collection
Swap () swap two set variables

Examples

Enter a text to find all the different words (sequential alphabetical sequence), output from small to large in dictionary order, Word is not case-sensitive

Sample Example

Code

#include <iostream>#include<string>#include<Set>#include<sstream>using namespacestd;Set<string>dict;//CollectionintMain () {stringS,buf;  while(cin>>R) {         for(intI=0; I<s.length (); i++)            if(Isalpha (S[i])) s[i]=ToLower (S[i]); Elses[i]=' ';               StringStream SS (s); //Create a StringStream object SS that stores a copy of S             while(SS&GT;&GT;BUF) Dict.insert (BUF);//Save converted lowercase words into the collection    }     for(Set<string>::iterator It=dict.begin (); It!=dict.end (); ++it) cout<<*it<<Endl; //System ("pause");    return 0;}

Isalpha () determines if the character ch is an English letter, and if it is lowercase, returns 2, or 1 if it is an uppercase letter. Returns 0 if it is not a letter.

ToLower () converts characters to lowercase letters, non-alphabetic characters do not make processing

STL Collection set--First Dictionary of Andy (pick)