Thread: Reading Input Files

This is one method:

Code:

#include <iostream>
#include <fstream>



using namespace std;
int main()
{

	ifstream file_in;

	file_in.open("input.txt");


	int _1;
	int _2;
	int _3;
	char check;

	file_in >> _1; //Goes first, we assume atleast one is there
	
	
	check = file_in.peek(); //Looks at next char


	if (check != '/n') //if next char is new line this if statement is skipped
	{
		file_in >> _2;
		check = file_in.peek();
	}

	if (check != '/n') // If same as before but with 3rd char
	{
		file_in >> _3;
	}




	file_in.close();

	cout << _1 << " " << _2 << " " << _3;

	system("pause");


	return 0;


}

Here is the input file:

Code:

1 2 3

It is clearly not done, it only gets one line.
You will want to put it in a loop to get all the lines until end of file.

The peek and the instream ignore spaces, so it works perfect in this case. Each number can be separated by 10 spaces and it will still work the same.

This is not the only method, but fairly easily.
Hopefully it gets you started in the correction direction.


Peek:
http://www.cplusplus.com/ref/iostream/istream/peek.html

It also currently hardcodeed to output all three no matter what, so if you make a input file with just 2 it will have error in the output.