Read from input file and later write back to that file

[newbiee999]

So in my C++ program, we have to first read data from a file. So for that I have declared my inputFile to be ifstream. But then later in the program, I want to write more data to that file. But to do that, my inputFile has to be ofstream.

So I do I do that ?

[2LzbRXSz]

From my understanding if you want a file to be read from - and to read from it, you need to define it as fstream

If you want to read up a little more on files, go right ahead:)
http://www.cplusplus.com/doc/tutorial/files/

[newbiee999]

Thanks, I got it!

[2LzbRXSz]

No prob bob!

[Sanction]

Something I'm been playing with and learning how to read and write from files..
My code doesn't add text to an already made text file tho.. I'm sure you code do something like... open file.. jump to end of file.. and then add text.. haven't gotten that far yet

#include <iostream>
#include <fstream>
#include <string>
#include <vector>

using namespace std;


void WriteToFile();
void ReadFromFile();
void LoadMap(vector<string> &mapdata);
void PrintMap(vector<string> mapdata);
int main()
{
	vector<string> Map;
	//WriteToFile();
	//ReadFromFile();

	LoadMap(Map);
	PrintMap(Map);



	system("PAUSE");
	return 0;
}

void WriteToFile()
{
	ofstream file;

	file.open("MyFile.txt");
	if (file.fail())
	{
		cout << "ERROR: Could not open file!" << endl;
		perror("MyFile.txt");
		cout << "ERROR: Could not open file!" << endl;
	}

	file << "Map:test" << endl;
	file << "XXX" << endl;
	file << "XXX" << endl;
	file << "XXX" << endl;

	file.close();

	cout << "Writing to file was a Succses!" << endl;
}

void ReadFromFile()
{
	ifstream file;

	file.open("MyFile.txt");
	if (file.fail())
	{
		cout << "ERROR: Could not open file!" << endl;
		perror("MyFile.txt");
		cout << "ERROR: Could not open file!" << endl;
	}

	string lineContent;

	while (getline(file, lineContent))
	{
		cout << lineContent << endl;
	}
	cout << endl;

	file.close();

	cout << "Reading from file was a Succses!" << endl;
}

void LoadMap(vector<string> &mapdata)
{
	ifstream file;

	file.open("MyFile.txt");
	if (file.fail())
	{
		cout << "ERROR: Could not open file!" << endl;
		perror("MyFile.txt");
		cout << "ERROR: Could not open file!" << endl;
	}

	string lineContent;

	while (getline(file, lineContent))
	{
		mapdata.push_back(lineContent);
	}

	file.close();
}

void PrintMap(vector<string> mapdata)
{
	for (auto i = mapdata.begin(); i != mapdata.end(); ++i) 
	{
		cout << *i << endl; 
	}
}