Question

How to append text to the end of a text file in C++

Answer 1

#include <iostream>
#include <fstream>

using std::cout;
using std::endl;

void print(char *filename)
{
	std::ifstream fin(filename);
	if (fin) {
		char ch;
		while (fin.get(ch))
			cout << ch;
	}
	fin.close();
}

int main()
{
	char filename[32] = "d:\\data.txt";

	std::ofstream ofs(filename, std::ios::app);
	if (!ofs) {
		cout << "Error open file for appending" << endl;
		return 1;
	}

	char s[64] = "python";
	ofs << s << "\n";
	ofs.close();

	print(filename);

	cout << endl;

	return 0;
}

/*
run:

c
c++
c#
java
php
python

*/

 

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