C++文件的操作

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<iostream>
#include<algorithm>
#include<fstream>
using namespace std;
int main()///对ASCLL文件的操作
{
    int a[10];
    ofstream outfile("f1.dat",ios::out);
    if(!outfile)
    {
        cout<<"open is error"<<endl;
        exit(0);
    }
    for(int i = 0; i < 10; i++)
    {
        cin>>a[i];
        outfile<<a[i]<<" ";
    }
    outfile.close();
    ifstream infile("f1.dat",ios::in);
    if(!infile)
    {
        cout<<"open is error"<<endl;
        exit(0);
    }
    for(int i = 0; i < 10; i++)
    {
        int b;
        infile>>b;
        cout<<b<<" ";
    }
    cout<<endl;
    infile.close();
    return 0;
}

 

 

 

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<iostream>
#include<algorithm>
#include<fstream>
using namespace std;
struct student
{
    char name[20];
    int num;
    int age;
    char sex;
};
int main()///对二进制文件的操作
{
    struct student stu[3] = {"Li",1001,18,'f',"Fan",1002,19,'m',"Wang",1004,17,'f'};
    cout<<stu[0].name<<endl;
    ofstream outfile("stu.dat",ios::binary);
    if(!outfile)
    {
        cerr<<"open error!"<<endl;
        abort();  ///退出程序 = exit
    }
    for(int i = 0; i < 3; i++)
        outfile.write((char *)&stu[i],sizeof(stu[i]));///char*--强制类型转换
    outfile.close();
    ifstream infile("stu.dat",ios::binary);
    if(!infile)
    {
        cerr<<"open error!"<<endl;
        exit(0);
    }
    student x;
    infile.read((char *)&x,sizeof(student));
    infile.close();
    cout<<"name: "<<x.name<<endl;
    return 0;
}