checking for a word from a file

[spiritedDedication]

I am trying to output the position of a word from a file.

I ask the user for a sentence.

std::string line;
  std::getline(std::cin, line);

i input the sentence into a file

std::fstream input;
input.open("input.txt");
input << line;

i ask them what word they want to find

std::string word;
std::cin >> word;

im stuck on how to check for the word.
any tips are greatly appreciated!

[dhruv90]

use a for loop

[Rehan FASTian]

Your program here: http://libraryofcprograms.blogspot.com/2013/05/finding-word-file.html

[vlad from moscow]

First of all you need read the sentence from the file the same way as you got the input from the user that is by means of getline

std::getline( input, line );

Then you should use std::istringstream and std::istream_iterator. For example

std::istringstream is( line );

auto it = std::find( std::istream_iterator<std::string>( is ),
                            std::istream_iterator<std::string>(),
                            word );

if ( it == std::istream_iterator<std::string>() )
{
   std::cout << "Word \"" << word << "\" is not present\n";
}
else 
{
   std::cout << "Word \"" << word << "\" is present\n";
}

[spiritedDedication]

I was able to implement somewhat the linked program from Rehan FASTian but unfortunately im not gettting the output i want.

I am trying to get the position in the line where the word was found, and output that.

here is what i have so far, its simply outputting a weird position that does not make sense. like 20 characters ahead of where it actually is.

#include<iostream>
#include<fstream>
#include<string>
#include<sstream>

int main()
{
	std::cout << "please enter a sentence. \n";

	std::string line;

	std::getline(std::cin, line);

	std::ofstream input;

	input.open("input.txt");

	input << line;

	input.close();

	std::cout << "What word would you like to find? \n";

	char word[10];

	std::cin.getline(word, 10, '\n');
	int size_of_word;
	for ( size_of_word = 0; word[size_of_word] != '\0'; size_of_word++ );

	std::ifstream out("input.txt");

	char sentence[200];
	int i = 0;
	bool found = false;

	while ( !out.eof() )
	{
		out.getline(sentence, 200, '\n');
		for ( int j = 0; sentence[j] != '\0'; j++ )
		{
			if(sentence[j] == word[i])
			{
				++i;
			}
			else
			{
				i = 0;
			}
			if(i >= size_of_word )
			{
				int n = out.tellg();
				std::cout << "Found at position: " << n << std::endl;
				found = true;
			}
		}
	}
	if(!found)
	{
		std::cout << "NOT Found!" << std::endl;
	}

	out.close();

	system("pause");
	return 0;
}