2023.5.6

//11-3
#include <iostream>
#include <fstream>
using namespace std;
void test01()
{
    ofstream ofs;
    ofs.open("test1.txt",ios::out);
    ofs<<"已成功写入文件";
    ofs.close();
}
int main()
{
    test01();
    return 0;
}

 

 

//11-5
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
void test01()
 {
      ofstream ofs;
      ofs.open("test1.txt",ios::out);
     ofs<<"已成功写入文件";
     ofs.close();
}
void test03()
{
    ///////////////////////////////
    ofstream ofs;
    ofs.open("test1.txt",ios::app);
    ofs<<"已成功添加字符";
    ofs.close();
    ///////////////////////////////
    ifstream ifs;
    ifs.open("test1.txt",ios::in);
    string buf;
    while(getline(ifs,buf))
    {
        cout<<buf<<endl;
    }
    ifs.close();
}
int main()
{
    //test01();
    test03();
    return 0;
}