exe12.4.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>
void main()
{
	fstream inf,outf;
	outf.open("my.dat",ios::out);
	if(!outf)
	{
		cout<<"Can't open file!\n";
		abort();
	}
	outf<<"abcdef"<<endl;
	outf<<"123456"<<endl;
	outf<<"ijklmn"<<endl;
	outf.close();
	inf.open("my.dat",ios::in);
	if(!inf)
	{
		cout<<"Can't open file!\n";
		abort();
	}
	char ch[80];
	int a(1);
	while(inf.getline(ch,sizeof(ch)))
		cout<<a++<<':'<<ch<<endl;
	inf.close();
}