prog1.cpp

C++语言程序设计题典

#include <iostream.h>
#include <fstream.h>
void main()
{
	char str[100];
	fstream out("abc.txt",ios::in|ios::out);
	out << "abcdefg";
	out.put('\n');
    out << "123456";
	out.seekp(0);
	while (!out.eof())
	{
		out.getline(str,100);
		cout << str;
	}
	cout << endl;
}