(四)C++篇-文件写入和读取

保证在运行目录中存在text.txt文件，否则需要附加相对路径或绝对路径找到该文件。

测试代码如下：

#include<iostream>
#include<fstream>
#include<string>

using namespace std;

int main()
{
    fstream myfile;
    
    //(1) 二选一: Append the text at the end.
    myfile.open ("text.txt",ofstream::app);
    myfile << "Writing this to a file.\n";
    myfile << "Hi Tekken.\n";
    myfile.close();
    
    //(2) 二选一: Clean the text 
    myfile.open ("text.txt",ofstream::out);
    myfile << "Writing this to a file.\n";
    myfile << "Hi Tekken.\n";
    myfile.close();
       
    // 读取文件
    string line;
    myfile.open("text.txt");
    if (myfile.is_open())
    {
        while(getline (myfile,line))
    {
        cout << line << '\n';
    }
        myfile.close();
    }

    else cout << "Unable to open file\n"; 

    return 0;
}

运行结果：

tekken@tekken:~/C++WS$ ./a.out 
Writing this to a file.
Hi Tekken.