C++学习(42)

 1 //二进制文件的读和写
 2 //istream & istream::read(char *,int);
 3 //ostream & ostream::write(const char *,int);
 4 #include<fstream.h>
 5 #include<string.h>
 6 
 7 class Student{
 8     public:
 9         char name[20];
10         long number;
11         int score;
12         Student(){}
13         Student(char *na,long nu=0,int sc=0){
14             strcpy(name,na);
15             number=nu;
16             score=sc;
17         }
18 };
19 
20 int main(){
21     char fileName[]="aaa.dat";
22     Student stu1("张三",111,100),stu2;
23     ofstream fileOut(fileName,ios::binary);
24     fileOut.write((char *)&stu1,sizeof(class Student));
25     fileOut.close();
26 
27     ifstream fileIn(fileName,ios::binary);
28     fileIn.read((char *)&stu2,sizeof(class Student));
29     fileIn.close();
30 
31     cout<<"姓名:"<<stu2.name<<endl;
32     cout<<"学号:"<<stu2.number<<endl;
33     cout<<"成绩:"<<stu2.score<<endl;
34     return 0;
35 }

aaa.dat文件的内容是

1 张三 烫烫烫烫烫烫烫蘯   d