Issues in using istringstream

Question

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

int main()
{
    ifstream infile ;
    infile.open("input.txt") ; 
    string line ; 

    int noOfVar,noOfCubes  ; 

    getline(infile,line) ; 
    istringstream iss(line) ; 
    iss >> noOfVar ; 

    getline(infile,line) ; 
    iss(line) ; 
    iss >> noOfCubes ; 

    cout << noOfCubes ; 
    cout << noOfVar  ; 

    return 0 ; 
}

I have an input file as follows

6 
4

Why isn't the above code working on that . I have declared the iss object once . Can't I use that again ? It is presently showing error in compilation .

Generally, one does not put a space between the end of the line and the `;` in C++. — crashmstr, May 01 '14 at 19:38
Related: http://stackoverflow.com/questions/2767298/c-repeatedly-using-istringstream — Daniel Castro, May 01 '14 at 19:38
Thanks a lot a guys for the reference . Should I delete this question ? — abkds, May 01 '14 at 19:41
@AbKDs I don't really think you should delete your question. You should at least clarify, which particular compiler error you got on which line. _'Doesn't work`_ is a bit too vague :-/ ... — πάντα ῥεῖ, May 01 '14 at 20:00

πάντα ῥεῖ · Accepted Answer · 2014-05-01T22:13:20.900

4

You cannot initialize the iss variable again using the constructor method:

iss(line) ;

You'll need to have another instance of std::istringstream for the second line, or
alternatively you can use the std::istringstream::str() function to set the contents (see here for a working sample).

edited May 01 '14 at 22:13

answered May 01 '14 at 19:44

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Issues in using istringstream

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