14、文件的简单操作

//文件写入
#include <iostream>
#include <iomanip>
#include <fstream>
using namespace std;

int main(void)
{
    ofstream outfile("f:\\f.txt",ios::out);
    if(!outfile)
        cerr<<"open fiald"<<endl;
    else
    {
        outfile<<"Lzy"<<endl;
        outfile.close();
    }

    return 0;
}


// 文件的读出
#include <iostream>
#include <iomanip>
#include <fstream>
using namespace std;

int main(void)
{
    char str[20];
    fstream infile("f:\\f.txt",ios::in);
    if(!infile)
        cerr<<"open fiald"<<endl;
    else
    {
        infile>>str;
        infile.close();
        cout<<str<<endl;
    }

    return 0;
}*/



/*
* 二进制文件访问
*/
#include <iostream>
#include <iomanip>
#include <fstream>
using namespace std;

int main(void)
{
    int date1[]={2011,8,9},date2[3];
    double x=3.14,y;

    fstream outfile("f:\\f.txt",ios::out|ios::binary);//是否以二进制文件打开看起来也没有别的什么区别
    if(!outfile)
    {
        cerr<<"open outfile failed"<<endl;
        abort();
    }
    outfile.write((char *)date1,sizeof(date1));
    outfile.write((char *)&x,sizeof(x));
    outfile.close();

    fstream infile("f:\\f.txt",ios::in|ios::binary);
    if(!infile)
    {
        cerr<<"open infile failed"<<endl;
        abort();
    }
    infile.read((char *)date2,sizeof(date2));
    infile.read((char *)&y,sizeof(y));
    infile.close();
    cout<<date2[0]<<'-'<<date2[1]<<'-'<<date2[2]<<'\t'<<y<<endl;

    return 0;
}