<<C++ Primer>> 第四版Exercise Section 8.4.1 练习题

For exercise 8.6

 // ConsoleApplication10.cpp : 定义控制台应用程序的入口点。
 //

 #include "stdafx.h"
 #include <iostream>
 #include <fstream>
 #include <sstream>

 using namespace std;

 void print(istream &in)
 {
     string str;
     while (in >> str)
     {
         cout << str << endl;
     }
 }

 int main()
 {
     ifstream in("d://hello.txt");
     print(in);
     in.clear();
     in.close();
     return ;
 }

For Exercise 8.7

 #include "stdafx.h"
 #include <iostream>
 #include <fstream>
 #include <sstream>
 #include <vector>

 using namespace std;

 int main()
 {
     vector<string> vect;
     vect.push_back("d://hello0.txt");
     vect.push_back("d://hello.txt");
     vect.push_back("d://hello1.txt");
     vect.push_back("d://hello2.txt");
     for (vector<string>::iterator begin = vect.begin(); begin != vect.end(); ++begin)
     {
         ifstream in;
         in.open(begin->c_str());
         if (!in)
         {
             cout << begin->c_str() << " does not exist in the system!!!" << endl;

             continue;
         }
         cout << "opening the file with name is: " << begin->c_str() << endl;
         string str;
         while (in >> str)
         {
             cout << str << endl;
         }
         in.clear();
         in.close();
     }
     return ;
 }