prog2.cpp

C++语言程序设计题典

#include <iostream.h>
#include <fstream.h>
#include <stdlib.h>
void main()
{
	struct student
	{
		char name[10];
		int no;
		double score;
	} stud[]={"Ma",9902,76,"Li",9906,85.6,"Zheng",9909,
		82.5,"Chen",9918,88.6};
	fstream file1;
	student one;
	file1.open("stud.dat",ios::in|ios::out|ios::binary);
	for (int i=0;i<4;i++)
		file1.write((char*)&stud[i],sizeof(student));
	file1.seekp(sizeof(student)*2);
	file1.read((char*)&one,sizeof(student));
	cout << one.no << " " << one.name << " " << one.score << endl;
	file1.close();
}