Question

How to insert character into a text file in C++

Answer 1

#include <iostream>
#include <fstream> 

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

int main(void)
{
	static const char *fileName = "d:\\test.txt";

	std::fstream out(fileName, std::ios::in | std::ios::out);
	if (!out) {
		cout << "Error open file.";
		return EXIT_FAILURE;;
	}

	out.write("c++ programming", 15);
	long pos = out.tellp();
	out.seekp(pos - 12);
	out.write("|", 1);

	out.close();

	return EXIT_SUCCESS;
}

/*
run:

test.txt
--------
c++|programming

*/

 

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