Searching problem

**182** · 02-16-2006

Hey guys, I am using code like the following ro help me identify words in a text file however if in a line there are the words "Hi my name is Kim" and I want to pick both words Hi and my from the same line how could I do this? Thanks.

Code:

  while (file >> array)
	   {
	
		if(strstr(array,"test") != 0)

              }

**laserlight** · 02-16-2006

Read line by line instead?

**182** · 02-16-2006

The problem is though that I dont want to identify the contents of the whole line just those two that are side by side.

**laserlight** · 02-16-2006

I dont want to identify the contents of the whole line to those two that are side by side.

Sorry, but I do not understand what you are talking about.

**182** · 02-16-2006

Sorry, what i am trying to do is to read a line from a txt file and just identify two words that are side by side and seperated by whitespace for example "hi my name is kim" if I wanted to just identify hi and my as being side by side on the same line how could this be achieved? Thanks.

**laserlight** · 02-16-2006

Read word by word, and once the first identified word is found, read the next word and check. If it isnt the second identified word, repeat the search from that point onwards.

**182** · 02-16-2006

good idea its amazing how lack of sleep can stop clear thinking.

Thanks again.

**182** · 02-16-2006

Just thought of something else how would you do it if you wanted to search for two words such as "hi my name is kim" and you want to find hi and kim but you do not know how many words will be seperating them in the text file?

**7stud** · 02-16-2006

Originally Posted by 182

Sorry, what i am trying to do is to read a line from a txt file and just identify two words that are side by side and seperated by whitespace for example "hi my name is kim" if I wanted to just identify hi and my as being side by side on the same line how could this be achieved? Thanks.

An easier way to accomplish that is to read the entire line into a string type using:

getline(myIfstreamObject, myVarThatIsAStringType);

Then you use a string's find() function to search the string for "hi my".

Just thought of something else how would you do it if you wanted to search for two words such as "hi my name is kim" and you want to find hi and kim but you do not know how many words will be seperating them in the text file?

Continuing with the above suggestion, you would use find() to search the string for "hi", and then you would use find() to search the string for "my". Of course that would also identify strings that have "my" first followed by "hi". If you only want strings with "hi" followed by "my", then when you search for "my" start searching the string from the location of "hi" to the end of the string rather than searching the whole string.

**joeprogrammer** · 02-16-2006

you can also use sscanf()

**182** · 02-16-2006

I will have to look these functions up as I have never heard of them before. Thanks for the advice guys I will look into those now

**Richie T** · 02-16-2006

well if you know which 2 words you want to search for, and you
can search word by word, you could search for one first, and
search the remaining text for the other. you could even make
it not order dependant by comparing each word read in to a list
you have prepared, using an array of some such. i'm not sure
of C++ file i/o yet so i won't post sample code, but just the
concept.

**182** · 02-16-2006

Thanks for the advice guys, do you know where I can see examples of the find() function working? I have looked on google but couldn't find anything useful?

**182** · 02-16-2006

Originally Posted by 7stud

An easier way to accomplish that is to read the entire line into a string type using:

getline(myIfstreamObject, myVarThatIsAStringType);

Then you use a string's find() function to search the string for "hi my".

Continuing with the above suggestion, you would use find() to search the string for "hi", and then you would use find() to search the string for "my". Of course that would also identify strings that have "my" first followed by "hi". If you only want strings with "hi" followed by "my", then when you search for "my" start searching the string from the location of "hi" to the end of the string rather than searching the whole string.

Im still having problems with this is there anyway it could work by adapting the following code even though it uses an array?

Code:

char array [200];
ifstream file;

      while (file >> array)
	   {
			if(strstr(array,"test") != 0)
           }

**swoopy** · 02-16-2006

Originally Posted by 182

Just thought of something else how would you do it if you wanted to search for two words such as "hi my name is kim" and you want to find hi and kim but you do not know how many words will be seperating them in the text file?

A stringstream might be a easy way to do this. It makes it easier because it will automatically skip whitespace. Here's an example which may give you some ideas.

Code:

#include <iostream>
#include <fstream>
#include <string>
#include <sstream>
using namespace std;

int main()
{   
   string filename = "file.txt";
   ifstream in(filename.c_str());
   if (!in.is_open())
   {
      cout << "Unable to open file." << endl;
      cin.get();
      return 1;
   }
   
   string line;
   bool found_hi = false;
      
   while (getline(in, line))
   //while (getline(cin, line))
   {
      istringstream iss(line);
      string word;
      while (iss >> word)
      {
         cout << word << endl;
         if (found_hi == true)
         {
            if (word == "kim")
            {
               cout << "Found hi and kim." << endl;
            }
         }
         else if (word == "hi")
         {
            found_hi = true;
         }
      }
   }
}

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