1 #include <iostream>
2 #include<fstream>
3 #include<string>
4
5 using namespace std;
6
7 int main()
8
9 {
10 ofstream outfile("test.txt");//创建新的文件
11 outfile << "hello file！";//这些文字进入到流中，这个流被写道文件里
12 outfile.close();//把这个文件关闭了
13
14
15 string file("one.txt");
16 //ifstream infile(file.c_str());//一定要用C风格的字符串
17 ifstream infile;//先创建一个Infile就没有绑定文件
18 infile.open(file.c_str());//再通过open来绑定
19
20 // if(infile)//检查打开文件是否成功
21 if(!infile)
22 {
23 cerr << "error: unable to open input file:"
24 << file << endl;
25 return -1;
26 }
27 string s;
28
29 while(infile >> s)
30 cout << s << endl;
31 infile.close();//记得把文件关闭 one.txt
32 infile.clear();//不仅要close,还要用clear恢复流的状态
33
34 file ="two.txt";
35 infile.open(file.c_str());
36 infile.open("two.txt");
37 if(!infile)
38 {
39
40 cerr << "error: unable to open input file:"
41 << file << endl;
42 return -1;
43 }
44 while(infile >> s)
45
46 {
47
48 cout << s << endl;
49 }
50
51 //cout << "读到的内容：" << s << endl;
52
53
54
55 return 0;
56 }
