Extract a word

**mario_75** · 01-21-2009

Hi all, this is my first post on the forum and I hope I can get some help with my problem.
I need to make a program to extract the last word from a sentence. I managed to extract the last character, but I have no idea how to get a word.

Code:

#include <iostream> 
#include <string> 
using namespace std; 
int main() 
{ 
 string strSentence = "Today will rain";
 int intLength;
 intLength = strSentence.length();
 cout << "\nThe last character of " << strSentence 
      << " is a " << "'"  << strSentence.substr(intLength - 1,1) << "'" ;
 cout << endl; 
 system("PAUSE"); 
 return 0; 
}//end main

Any help is appreciated!

**tabstop** · 01-21-2009

So do the same thing, except start at the first character of the last word. Note also that string has member functions that can find, say, the last space in the word.

**mario_75** · 01-21-2009

Yes, I know how to get a character or a word for a given sentence

Code:

#include <iostream> 
#include <string> 
using namespace std; 
int main() 
{ 
 string strSentence = "Today will rain";
 int intLength;
 intLength = strSentence.length();
 cout << "\nThe last character of " << strSentence 
      << " is a " << "'"  << strSentence.substr(intLength - 4,4) << "'" ;
 cout << endl; 
 system("PAUSE"); 
 return 0; 
}//end main

this will return "rain", but if the sentence is unknown, then I run into problems.
Your other suggestion with the last space sounds like it might work , only if I knew what function you are talking about!

**tabstop** · 01-21-2009

That's why they have (a) books (b) informational pages like cplusplus.com (c) google.

**mario_75** · 01-21-2009

I thought that it may had something to do with the last space and I had used option (c), but the results

Code:

in.find_last_of(" ")

or

rfind(' ');

are too advanced for what I need to use at the moment and for my knowledge.
Anyway, thanks for your advices.

**King Mir** · 01-22-2009

Words are how C++ naturally breaks up streams when read into strings.

So in this case you can use an output string stream to read word by word. You can use "mysstream >> word" or a stream iterator. You will then need to strip punctuation, which to do well would require a dictionary, but can be done reasonably well by stripping everything at the beginning and end of words.

**Masterx** · 01-22-2009

by teh way guys , does any one know why this doesnt work?

Code:

#include <cstdlib>
#include <iostream>
#include "linescanner.h"
#include <string>
#include <cctype>
#include <cstring>

using namespace std;

int main(int argc, char *argv[])
{
       int choice = 0, found1=0, check=0, found2=0;
    
       string str ("loop : RED X num");
       char * cstr;
       int k = str.length();
       char c; 
       found1=str.find(" X ");
       found2=str.find(" : "); 

       cstr = new char [str.size()+1];
       strcpy (cstr, str.c_str());
       c = cstr[k-1];     
           
        if ( found1 !=-1  ) //if the " X " is found then proceed to the next step 
        {
                 

                if (found2 !=-1)  //if " : " (the colon is found ) then >> next step
                {
                        cout<<"found "<<found2<<endl;
                        if (isalpha(c))
                        {
                                
                                check = 15;
                                cout<<"check"<<check;
                                //return 15;      //its a  command with X and string offset ( RED X num)
                        }
                }



        }
        cout<<check;
    
    system("PAUSE");
    return EXIT_SUCCESS;
}

**mario_75** · 01-22-2009

Originally Posted by King Mir

Words are how C++ naturally breaks up streams when read into strings.

So in this case you can use an output string stream to read word by word. You can use "mysstream >> word" or a stream iterator. You will then need to strip punctuation, which to do well would require a dictionary, but can be done reasonably well by stripping everything at the beginning and end of words.

Thanks for advice, I'll see what I can do with the new load of info!

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