7.02-文件尾添加内容.cpp

Visual C++的课件

#include <fstream.h>
int main()   // returns 1 on error
{
	char fileName[80];
	char buffer[255];
	cout << "Please re-enter the file name: ";
	cin >> fileName;

	ifstream fin(fileName);
	if (fin)                // already exists?
	{
		cout << "Current file contents:\n";
		char ch;
		while (fin.get(ch))
			cout << ch;
		cout << "\n***End of file contents.***\n";
	}
	fin.close();

	cout << "\nOpening " << fileName << " in append mode...\n";

	ofstream fout(fileName,ios::app);
	if (!fout)
	{
		cout << "Unable to open " << fileName << " for appending.\n";
		return(1);
	}

	cout << "\nEnter text for the file: ";
	cin.ignore(1,'\n');
	cin.getline(buffer,255);
	fout << buffer << "\n"; // add a return;
	fout.close();

	fin.open(fileName);  // reassign existing fin object!
	if (!fin)
	{
		cout << "Unable to open " << fileName << " for reading.\n";
		return(1);
	}
	cout << "\nHere's the contents of the file:\n";
	char ch;
	while (fin.get(ch))
		cout << ch;
	cout << "\n***End of file contents.***\n";
	fin.close();
	return 0;
}