exe12.6.cpp

这是C++的一部分练习程序!对初学者有一定的帮助作用。

#include <iostream.h>
#include <fstream.h>
#include <stdlib.h>
struct student
{
	char name[20];
	long int number;
	int totalscore;
}stu[5]={"Li",502001,287,"Gao",502004,290,"Yan",5002011,278,"Lu",502014,285,"Hu",502023,279};
void main()
{
	student s1;
	fstream file("my3.dat",ios::out|ios::in|ios::binary);
	if(!file)
	{
		cout<<"Can't open file!\n";
		abort();
	}
	for(int i=0;i<5;i++)
		file.write((char *)&stu[i],sizeof(student));
	file.seekp(sizeof(student)*2);
	file.read((char *)&s1,sizeof(stu[i]));
	cout<<s1.name<<'\t'<<s1.number<<'\t'<<s1.totalscore<<endl;
	file.close();
}