“《编程珠玑》（第2版）第2章”：A题

                 1 #include <iostream>
 2 #include <fstream>
 3 #include <string>
 4 #include <sstream>
 5 #include <math.h>
 6usingnamespace std;
 7 8int main()
 9{
10// *************************** Write File *************************** //11// Open file12     ofstream wfile("file.txt", ios::out);
13if (!wfile)
14    {
15         cout << "The file can not be opened!" << endl;
16         exit(1);
17    }
1819for (int i = 0; i < pow(2, 16); i++)
20    {
21        stringstream ss;
22         ss << i;
23string str = ss.str();
24         wfile << str;
25         wfile << endl;
26    }
2728// Close the file29    wfile.close();
3031// *************************** Read File *************************** //32// Open file33     ifstream rfile("file.txt", ios::in);
34if (!rfile)
35    {
36         cout << "The file can not be opened!" << endl;
37         exit(1);
38    }
3940string line;
41int num;
42while (getline(rfile, line))
43    {
44// cout << line << endl;45        stringstream ss;
46         ss << line;
47         ss >> num;
48         cout << num << endl;
49    }
5051// Close the file52    rfile.close();
5354return0;
55 }