从键盘输入一个字符串、一个整数和一个实数，将其写入文件f1.txt中，再用读字符方式从此文本文件中逐个读出并显示在屏幕上

#include<iostream>
#include<fstream>
using namespace std;

int main(void)
{
    char buf[1024];
    int value;
    double number;
    ofstream ofs;
    ofs.open("test.txt");
    if(ofs.is_open()){
        cout << "opening file success!" << endl;
    }
    cout << "Enter your string :";
    cin.getline(buf, 100);
    ofs << buf << endl;
    cout << "Enter your int :";
    cin >> value;
    ofs << value << endl;
    cout << "Enter your double :";
    cin >> number;
    ofs << number << endl;

    ifstream ifs;
    ifs.open("test.txt", ios::in);
    if(ifs.is_open()){
        cout << "opening file success!" << endl;
    }
    cout << "Reading the file:" << endl;
   
    ifs >> buf;  
    cout << buf << endl;
    ifs >> value;
    cout << value <<  endl;
    ifs >> number;
    cout << number << endl;

    return 0;
}