C++stl set container and Stream class

First the stream stream class

Header file # include <sstream>

Its function is the conversion between different types, and the C language fscanf and fprintf role is the same, but more than the C language more convenient and better use.

Very easy to use method

#include <string> #include <sstream> #include <iostream> int main () {    std::stringstream stream;    std::string result;    int i = n;    Stream << i; input int Stream stream    >> result;//extract the previously inserted int value from stream    

The above code converts the string type to int.

！！ Note: It has a buffering function during the conversion process, for example, there is a string "Dada fffff"

Entering a string by buffering once through the while loop

Example:

        StringStream SS (s);        while (SS>>TMP)//Can press a space one output        Val.insert (TMP);

The following sets the set container. is a tree. To be able to carry out a heavy sentence, to filter out repeatedly.

Look at this topic: uva1085 Andy's first diction

Test instructions is to give you a bunch of English. Let you read the words inside and not repeat them.

With a set container, very easy

#include <cstdio> #include <algorithm> #include <iostream> #include <sstream> #include < Ctype.h> #include <set>using namespace std;set<string> val;int main () {    string s,tmp;    while (Cin>>s)    {        if (s== ' break ') break            ;        for (int i=0;i<s.size (); i++)        {            if (Isalpha (S[i]))                S[i]=tolower (S[i]);            else                s[i]= ';        }        StringStream SS (s);        while (SS>>TMP)//Can press a space one output        Val.insert (TMP);    }    For (Set<string>::iterator It=val.begin (); It!=val.end (); it++)        cout<<*it<<endl;    return 0;}

C++stl set container and Stream class