Question

C++ string to vector

Asked by: dandeliondream

Hi,

I'm trying to code a program that take in a string and break the string into words. Then, insert the words into a vector<string>.

Output:
Enter words:
apple orange pear

apple -
orange -
pear -

#include <iostream>
#include <vector>
#include <sstream>
#include <string>
using namespace std; 
int main ()
{
	string input,f1; 
	vector<string> v; 
	//while loop condition: not end of file
	while (!cin.eof())
	{ 
		cout << "Enter words" << endl; 
		//retrieve input from user
		getline(cin,input); 
		//split the string input into separate field to be use later on
		istringstream field(input); 
		//getting data from separate field
		while (!field.eof())
		{
			field >> f1;
			v.push_back(f1);
		}
			
	} 
	for (int i = 0; i < v.size(); i++)
		cout << v[i] << " - " << endl; 
	
}

                                  
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Asked On
2009-11-03 at 16:30:43ID24869435
Topic

C++ Programming Language

Participating Experts
4
Points
500
Comments
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Answers

 

by: JimUPosted on 2009-11-03 at 16:38:58ID: 25735420

So what is the problem?

One issue I see with your code is that you need to check for cin.eof() after the getline() call.

 

by: trinitrotoluenePosted on 2009-11-03 at 17:00:18ID: 25735533

you can do it the following way using the string class. Look at my code snippet

If you want to work with plain old character arrays then strtok() would be the way to go.

getline(cin,input); 
                //split the string input into separate field to be use later on
//create a string stream                
stringstream field(input); 
                //getting data from separate field
                //put a string into f1 everytime a space is seen
                while (field >> f1)
                {                        
                     v.push_back(f1);
                }
                //v will now contain the individual words

                                              
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by: trinitrotoluenePosted on 2009-11-03 at 17:04:13ID: 25735560

i would like to mention that the string class overcomes pitfalls of character arrays used in C to represent strings. It is also STL compatible so it is recommended to use it unless ofcourse considerations of performance are inviolable requirements of your application.

 

by: jkrPosted on 2009-11-03 at 18:29:43ID: 25735897

Try the following:

#include <string>
#include <vector>
#include <iostream>
 
using namespace std;
 
int split_text(string strIn, const char cDelim, vector<string>& vResult) {
 
   int nPos = 0;
   int nCount = 0;
   int nFound;
   string strToken;
 
   while(1) {
 
      nFound = strIn.find(cDelim,nPos);
 
      if (-1 == nFound)  {
 
        strToken = strIn.substr(nPos,strIn.length() - nPos);
        vResult.push_back(strToken);
        break;
      }
 
      strToken = strIn.substr(nPos,nFound - nPos);
 
      nPos = nFound + 1;
 
      ++nCount;
 
      vResult.push_back(strToken);
 
   }
 
   return nCount;
}
 
int main () {
 
  vector<string> vResult;
 
   int n = split_text("apple orange pear",' ',vResult);
 
   for ( int i = 0; i < n; ++i)
      cout << vResult[i] << endl;
}

                                              
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by: trinitrotoluenePosted on 2009-11-03 at 18:42:49ID: 25735954

here's an alternative way which avoids the creation of string streams and the string f1. you need to specify what the delimiter is though.

additionally you can pull my snippet into a separate function and call it wherever you need to use it.

string delimiter(" ");
while (!cin.eof())
        { 
                cout << "Enter words" << endl; 
                //retrieve input from user
                getline(cin,input); 
                
string::size_type start = input.find_first_not_of(delimiter, 0); 
string::size_type end = input.find_first_of(delimiter,start); 
while(start!=string::npos || end!=string::npos)
{
   v.push_back(input.substr(start,end-start));
  
   start = input.find_first_not_of(delimiter, end);
   end = input.find_first_of(delimiter,start);
}
                        
 
} 

                                              
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by: itsmeandnobodyelsePosted on 2009-11-04 at 02:12:42ID: 25737840

The code of trinitrotoluene posted in #25735533 should do it.

I took your initial code and

  - removed the outer while (!cin.eof())

    cin never will have eof and the getline(cin, input) already will catch all the words.

  - changed the inner while loop to
                // at end of field stream the (field >> f1) would return NULL == FALSE
      while ((field>>f1))
      {
            v.push_back(f1);
      }

     what is the same trinitrotoluene has suggested.

That's all.

Enter words
the yellow fox jumps over the fence
the -
yellow -
fox -
jumps -
over -
the -
fence -

                                              
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by: dandeliondreamPosted on 2009-11-04 at 07:19:13ID: 31649778

thanks..sorry for the late reply. i only have time in the evening to access the net.

20120131-EE-VQP-002

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