12.16.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 person
{
	char name[20];
	double height;
	unsigned short age;
};
struct person people[5]={"Li",1.88,35,"Hu",1.91,25,"Gao",1.75,33,"Mao",1.72,32,"Lu",1.69,50};
void main()
{
	fstream file;
	file.open("f5.dat",ios::in|ios::out|ios::binary);
	if(!file)
	{
		cerr<<"f5.dat can't open.\n";
		abort();
	}
	for(int i(0);i<5;i++)
		file.write((char *)&people[i],sizeof(people[i]));
	file.seekp(0,ios::beg);
	for(i=0;i<5;i++)
	{
		file.read((char *)&people[i],sizeof(people[i]));
		cout<<people[i].name<<'\t'<<people[i].height<<'\t'<<people[i].age<<endl;
	}
	file.close();
}