C++文件操作

#include <iostream>
#include <fstream>
using namespace std;
int main(void)
{
    ofstream ofs("file.txt");//类似fprintf，写文件
    ofs << 123 << ' ' << 4.56 << ' ' <<
        "HelloWorld" << endl;
    ofs.close();
    ifstream ifs("file.txt");//类似fscanf，读文件
    int i;
    double d;
    char s[20] = {0};
    ifs >> i >> d >> s;
    cout << "i=" << i << ",d=" << d <<
        ",s=" << s << endl;
    ifs.close();
    return 0;
}

#include <iostream>
#include <fstream>
using namespace std;
int main(void)
{
    ofstream ofs("last.txt");
    char wbuf[] = "五一假期快乐!";
    ofs.write(wbuf,sizeof(wbuf));
    ofs.close();
    ifstream ifs("last.txt");
    char rbuf[100] = {0};
    ifs.read(rbuf,sizeof(rbuf));
    cout << "读到数据:" << rbuf << endl;
    ifs.close();
    return 0;
}