2023.5.6

 1 //11-3
 2 #include <iostream>
 3 #include <fstream>
 4 using namespace std;
 5 void test01()
 6 {
 7     ofstream ofs;
 8     ofs.open("test1.txt",ios::out);
 9     ofs<<"已成功写入文件";
10     ofs.close();
11 }
12 int main()
13 {
14     test01();
15     return 0;
16 }

 1 //11-5
 2 #include <iostream>
 3 #include <fstream>
 4 #include <string>
 5 using namespace std;
 6 void test01()
 7  {
 8       ofstream ofs;
 9       ofs.open("test1.txt",ios::out);
10      ofs<<"已成功写入文件";
11      ofs.close();
12 }
13 void test03()
14 {
15     ///////////////////////////////
16     ofstream ofs;
17     ofs.open("test1.txt",ios::app);
18     ofs<<"已成功添加字符";
19     ofs.close();
20     ///////////////////////////////
21     ifstream ifs;
22     ifs.open("test1.txt",ios::in);
23     string buf;
24     while(getline(ifs,buf))
25     {
26         cout<<buf<<endl;
27     }
28     ifs.close();
29 }
30 int main()
31 {
32     //test01();
33     test03();
34     return 0;
35 }