get line from text file by line number

[trojsi]

I have just finished a hangman game in win console with words selected randomly from an array of strings. I need to change it get words randomly. I do not wish to get all the words and put them in an array. Instead I want to go to a specific line (text file has 1 word per line) and put the word in a string. Is this complicated? Any help would be appreciated a lot.

Brandon

[James Grider]

It seems to me what you are looking for is the seekg function.

http://www.cplusplus.com/reference/iostream/istream/seekg/

Or seekp for ostream.

http://www.cplusplus.com/reference/iostream/ostream/seekp/

[trojsi]

Could anyone write a small example pls? Say I need to get a word that is at line 3..
The links only seems to work with single characters. Is it the \n as a deliminator that has to do the magic?

thanks

[tfityo]

ifstream f("input.txt");
string s;
getline(f, s);
getline(f, s);
getline(f, s); //here is 3rd line
processLine(s); //do what you want
f.close();

Is it you wanted?

[trojsi]

Am I doing something wrong here? I am not getting anything..

#include <iostream>
#include <fstream>

#include <string>


using namespace std;


int main()

{

	ifstream f("input.txt");
	string s;
	getline(f, s);
	getline(f, s);
	getline(f, s); //here is 3rd line
	
	cout << s << endl;
	f.close();
	
	system("pause");
	
	return 0;


}

[tfityo]

It is proper code.

Can you show content of "input.txt" file?

Is this file in your working folder? Isn't it empty?

[trojsi]

Wonderful :) .. thanks a lot . It was in the wrong folder.

thanks again,

[trojsi]

Hi, its me again. I need the same procedure but with the difference to over write a specific line.
should I just use ofstream instead?

[tfityo]

Yes, if you want to write then use ofstream. But you cannot modify text file.
So, my recommendation is: read the entire file in array of strings, modify them as needed and save to file in any order you want.