编程珠玑第15章字符串stl set和map容器排序字符串

#include <iostream>
#include <fstream>
#include <string>
#include <set>
using namespace std;
void TokenWordFromTxt(set<string> &S,ifstream &in)
{
char *pch;
char *psrc = NULL;
for (string str; getline(in,str);)//一行一行的读取换行符号"\n"结束
{
cout<<str<<"\n";
psrc = const_cast<char *>(str.c_str()) ;//利用string::c_str将string 转换成char*，又由于其是const的strtok不接受const，取出常量性
pch = strtok(psrc,",.: ");
while(pch != NULL)
{
//printf ("---%s\n",pch);
string t = pch;
S.insert(t);
pch = strtok(NULL,",.: \"");//c库提供的分词函数
}
}
}
void PrintSet(set<string> &S)
{
set<string>::iterator iter;
int i=0;
for (iter = S.begin();iter!=S.end();++iter)
{
i++;
cout<<"--"<<i<<":"<<*iter<<endl;
}

}
int main()
{
ifstream in("D:\\word.txt");//读取文件
set<string> S;//利用set，stl提供的set
TokenWordFromTxt(S,in);
PrintSet(S);
system("pause");
return 0;
}

#include <iostream>
#include <fstream>
#include <string>
#include <map>
using namespace std;
void TokenWordFromTxt(map<string,int> &M,ifstream &in)
{
char *pch;
char *psrc = NULL;
for (string str; getline(in,str);)//一行一行的读取换行符号"\n"结束
{
cout<<str<<"\n";
psrc = const_cast<char *>(str.c_str()) ;//利用string::c_str将string 转换成char*，又由于其是const的strtok不接受const，取出常量性
pch = strtok(psrc,",.: ");
while(pch != NULL)
{
//printf ("---%s\n",pch);
string t = pch;
M[t]++;
pch = strtok(NULL,",.: \"");//c库提供的分词函数
}
}
}
void PrintSet(map<string,int> &M)
{
map<string,int>::iterator iter;
int i=0;
for (iter = M.begin();iter!=M.end();++iter)
{
i++;
cout<<"--"<<i<<":"<<iter->first<<":"<<iter->second<<endl;
}

}
int main()
{
ifstream in("D:\\word.txt");//读取文件
map<string,int> M;//利用set
TokenWordFromTxt(M,in);
PrintSet(M);

system("pause");
return 0;
}