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Tom 23245332Jenny 22231231Heny 22183942Tom 23245332...

awk '{print $1}' name.txt | sort | uniq 

#include <string>#include <iostream>#include <algorithm>#include <vector>#include <fstream>using namespace std;int main(){ifstream in("name.txt");string strtmp;vector<string> vect;while(getline(in, strtmp, '\n'))vect.push_back(strtmp.substr(0, strtmp.find(' ')));sort(vect.begin(), vect.end());vector<string>::iterator it=unique(vect.begin(), vect.end());copy(vect.begin(), it, ostream_iterator<string>(cout, "\n"));return 0;}

extern "C++" {typedef basic_string <char> string;typedef basic_string <wchar_t> wstring;} // extern "C++"

#include <string>#include <iostream>using namespace std;int main(){string strinfo="Please input your name:";cout << strinfo ;cin >> strinfo;if( strinfo == "winter" )cout << "you are winter!"<<endl;else if( strinfo != "wende" )cout << "you are not wende!"<<endl;else if( strinfo < "winter")cout << "your name should be ahead of winter"<<endl;elsecout << "your name should be after of winter"<<endl;strinfo += " , Welcome to China!";cout << strinfo<<endl;cout <<"Your name is :"<<endl;string strtmp = "How are you? " + strinfo;for(int i = 0 ; i < strtmp.size(); i ++)cout<<strtmp[i];return 0;} 

-bash-2.05b$ make ttc++  -O -pipe -march=pentiumpro  tt.cpp  -o tt-bash-2.05b$ ./ttPlease input your name:Heroyou are not wende!Hero , Welcome to China!How are you? Hero , Welcome to China!

map<string, int> mymap;//以上默認使用了 less<string>

string strinfo="Winter";string strlast="Hello " + strinfo + "!";//你還可以這樣：string strtest="Hello " + strinfo + " Welcome" + " to China" + " !";

string str="winter";//下面一行有可能會(huì )引起程序中斷錯誤str[100]='!';//下面會(huì )拋出異常:throws: out_of_rangecout<<str.at(100)<<endl;

size_type find_first_of(const basic_string& s, size_type pos = 0)size_type find_first_of(const charT* s, size_type pos, size_type n)size_type find_first_of(const charT* s, size_type pos = 0)size_type find_first_of(charT c, size_type pos = 0)

template <class _CharT, class _Traits, class _Alloc>const basic_string<_CharT,_Traits,_Alloc>::size_typebasic_string<_CharT,_Traits,_Alloc>::npos= basic_string<_CharT,_Traits,_Alloc>::size_type) -1;

#include <string>#include <iostream>using namespace std;int main(){string strinfo="   //*---Hello Word!......------";string strset="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";int first = strinfo.find_first_of(strset);if(first == string::npos) {cout<<"not find any characters"<<endl;return -1;}int last = strinfo.find_last_of(strset);if(last == string::npos) {cout<<"not find any characters"<<endl;return -1;}cout << strinfo.substr(first, last - first + 1)<<endl;return 0;}

Hello Word

張三|3456123, 湖南李四,4564234| 湖北王小二, 4433253|北京...

void string_replace(string & strBig, const string & strsrc, const string &strdst) {string::size_type pos=0;string::size_type srclen=strsrc.size();string::size_type dstlen=strdst.size();while( (pos=strBig.find(strsrc, pos)) != string::npos){strBig.replace(pos, srclen, strdst);pos += dstlen;}}

#include <string>#include <iostream>using namespace std;int main() {string strinfo="This is Winter, Winter is a programmer. Do you know Winter?";cout<<"Orign string is :\n"<<strinfo<<endl;string_replace(strinfo, "Winter", "wende");cout<<"After replace Winter with wende, the string is :\n"<<strinfo<<endl;return 0;}

Orign string is :This is Winter, Winter is a programmer. Do you know Winter?After replace Winter with wende, the string is :This is wende, wende is a programmer. Do you know wende?

void string_replace(string & strBig, const string & strsrc, const string &strdst) {string::size_type pos=0;string::size_type srclen=strsrc.size();string::size_type dstlen=strdst.size();while( (pos=strBig.find(strsrc, pos)) != string::npos){strBig.erase(pos, srclen);strBig.insert(pos, strdst);pos += dstlen;}}

string_replace(strinfo, "Winter", "wende");

void string_replace(string & strBig, const string & strsrc, const string &strdst) 

const charT* c_str() constconst charT* data() constsize_type copy(charT* buf, size_type n, size_type pos = 0) const 

const charT* c_str () const{ if (length () == 0) return ""; terminate (); return data (); }

string strinfo("this is Winter");...//最好的方式是:foo(strinfo.c_str());//也可以這么用:const char* pstr=strinfo.c_str();foo(pstr);//不要再使用了pstr了, 下面的操作已經(jīng)使pstr無(wú)效了。strinfo += " Hello!";foo(pstr);//錯誤！

template <class charT, class traits = char_traits<charT>,class Allocator = allocator<charT> >class basic_string{//...}