Put a Number from a .txt file to a int variable ?

[Coding]

I have a .txt file(file1) that contains one number: 1

What I want to do now is in my code below put this Number that in this case is: 1 into the variable: "int tal = 0"
How is it possible to do this ? I suppose the number 1 is considered to be a string in the textfile ?
Thanks.

#include "stdafx.h"
#include <iostream>
#include <fstream>
#include <sstream> 
#include <string>  

using namespace std;

int main () 

{ char Number[20];
  int tal = 0;
  ofstream Test;
  Test.open ("file2.txt");
  ifstream myfile ("file1.txt");
  myfile >> Number;

  Test << tal <<"\n";
  return 0;
}

[Elysia]

In this case, myfile >> tal would do fine, I believe.
And post in the appropriate forum next time, if you did it on purpose.

[laserlight]

Moved to the C++ board.

[Coding]

Elysia

Thank You it did work...
But haven´t I posted in the right forum for this question ?
My question is under "Forum: C++ Programming"

And if not what is the link to the right place to post C++ questions ?
Thanks

[laserlight]

You originally posted this in "Projects and Job Recruitment".

[matsp]

Elysia

Thank You it did work...
But haven´t I posted in the right forum for this question ?
My question is under "Forum: C++ Programming"

And if not what is the link to the right place to post C++ questions ?
Thanks

It is in that place right now - but I presume based on laserlight's comment that it wasn't previously and that it's now been moved.

By the way, the contents of a file isn't "considered a string" - it's just a stream of bytes to the C++ runtime library. You can then ask the C++ runtime to read it as an integer, string, float, bool. If you implement your own class, you can (if you like) implement your own function to read the entire class content in from a stream. For example, if you make your own complex class, the input of that could be two reads of a double.

--
Mats

[Coding]

Yes now I understand. I will put questions under "C++ Programming" I thought I did that but now I know.
Ok, I think I follow your description.. I will experiment with this...

Coding

[Elysia]

Be careful when using operators << and >> with streams. They're interpreted as text and should probably be read back as text too, otherwise the offset might not match when you read data back.

[matsp]

Be careful when using operators << and >> with streams. They're interpreted as text and should probably be read back as text too, otherwise the offset might not match when you read data back.

You mean "you shouldn't store binary data when using >>" - sure, that's not what I meant either.

--
Mats

[Elysia]

Yes, but reading back into a non-string buffer may also cause problems.

// Assume ofile is ostream.
file << "120" << "120";
// Assume ifile is an istream
UINT64 num, num2;
file >> num;
file >> num2;

num will probably be 120120 (or something like that) and num2 will fail.