【C++】C++11讀取寫入文件

參考鏈接：
1、https://www.w3cschool.cn/cpp/cpp-files-streams.html
2、https://blog.csdn.net/jllongbell/article/details/79087281
3、https://blog.csdn.net/buknow/article/details/87973205
4、https://www.cnblogs.com/nkzhangcheng/p/7722568.html

#include <iostream>
#include <fstream>

#include <cassert>// assert()

using namespace std;

void testWrite()
{
// write file
    ofstream outfile;
    outfile.open("afile.dat", ios::out | ios::trunc);
    assert(outfile.is_open());
    for(int i = 0;i < 10;i++) outfile << "Hello file world!" << endl;
    outfile.close();
// read file
    ifstream infile;
    string buffstr;
    infile.open("afile.dat", ios::in);
    assert(infile.is_open());
// read line and line
    while(getline(infile, buffstr))
    {
        cout << buffstr << endl;// red line string
        break;
    }
// read char and char
    infile.seekg(16, ios::beg);// set to file begin
    char ch = '\0';
    infile >> noskipws;// not ignore Spaces and enter
    while(!infile.eof())
    {
        infile >> ch;
        cout << ch << ",";
    }
    infile.close();
}

int main(int argc, char *argv[])
{
    cout << "Hello main World!" << endl;
    testWrite();
    return 0;
}