Question : How would I output to CString instead of using stringstream ss?

I have some code below. What it does is this: There are students A-G engaged in a contest to launch an object as far as they can (measured in feet). They are given multiple tries and the program below finds all instances when there are TIES in distance thrown, between 2 or more different students and outputs it to the screen like so:

44 feet: C, E
33 feet: B, D
22 feet: A, C, D, F

The program works great. Now, what I'd like to do is instead of outputting to the screen using stringstream I want the output to be contained in a CString called csOutput. The reason for this is that I will take the CString and use it with some other already written code that I have. So, how do I output to CString csOutput?

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#include <iomanip>
#include <iostream>
#include <string>
#include <sstream>
#include <set>
#include <vector>
#include <algorithm>

using namespace std;

struct StudentAttempt
{
   int distance;
   string studentName;
};

bool cmpAttempts(StudentAttempt left, StudentAttempt right) {
   if( left.distance < right.distance ) {
      return true;
   }
   else if( left.distance == right.distance ) {
      if( left.studentName < right.studentName ) {
         return true;
      }
      else
         return false;
   }
   else
      return false;
}

bool isDistEqual( StudentAttempt left, StudentAttempt right) {
   return ( left.distance == right.distance
      && left.studentName != right.studentName );
}

size_t printAllEqual(const vector<StudentAttempt>& v, const StudentAttempt& sa, stringstream& ss ) {

  vector<StudentAttempt>::const_iterator i = v.begin();
  size_t sz = 0;

  while (i != v.end()) {

    if(isDistEqual(*i,sa)) {
    
      ss << i->studentName;
      ++sz;
    }

    ++i;
  }

  return sz;
}

int main() {

   StudentAttempt throwDist[] = {
      {50, "A"},      {22, "A"},      {16, "B"},      {44, "C"},
      {33, "D"},      {34, "E"},      {22, "F"},      {21, "G"},
      {49, "A"},      { 5, "B"},      { 2, "C"},      {22, "A"},
      {33, "B"},      {22, "C"},      {22, "D"},      {44, "E"},
   };

   set<int> handled;

   int len = sizeof( throwDist )/ sizeof( throwDist[0] );
   vector<StudentAttempt> dist(throwDist, throwDist + len);
   vector<StudentAttempt>::iterator it = dist.begin();

   sort( dist.begin(), dist.end(), cmpAttempts);

   for( ; it != dist.end(); it++ ) {

      stringstream ss;

      pair<set<int>::iterator,bool> p = handled.insert(it->distance);

      if (!p.second) continue; // already handled

      if(0 < printAllEqual(dist,*it,ss)) 
        cout << setw(2) << (*it).distance 
           << " feet:  " << (*it).studentName << ss.str() << endl;
   }

   
}

Answer : How would I output to CString instead of using stringstream ss?

Well, even though I'd still recommend STL over MFC, this can also be done, e.g.

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#include <iomanip>
#include <iostream>
#include <string>
#include <set>
#include <vector>
#include <algorithm>

using namespace std;

struct StudentAttempt
{
   int distance;
   string studentName;
};

bool cmpAttempts(StudentAttempt left, StudentAttempt right) {
   if( left.distance < right.distance ) {
      return true;
   }
   else if( left.distance == right.distance ) {
      if( left.studentName < right.studentName ) {
         return true;
      }
      else
         return false;
   }
   else
      return false;
}

bool isDistEqual( StudentAttempt left, StudentAttempt right) {
   return ( left.distance == right.distance
      && left.studentName != right.studentName );
}

size_t printAllEqual(const vector<StudentAttempt>& v, const StudentAttempt& sa, CString& str ) {

  vector<StudentAttempt>::const_iterator i = v.begin();
  size_t sz = 0;

  while (i != v.end()) {

    if(isDistEqual(*i,sa)) {
    
      str += i->studentName;
      ++sz;
    }

    ++i;
  }

  return sz;
}

int main() {

   StudentAttempt throwDist[] = {
      {50, "A"},      {22, "A"},      {16, "B"},      {44, "C"},
      {33, "D"},      {34, "E"},      {22, "F"},      {21, "G"},
      {49, "A"},      { 5, "B"},      { 2, "C"},      {22, "A"},
      {33, "B"},      {22, "C"},      {22, "D"},      {44, "E"},
   };

   set<int> handled;

   int len = sizeof( throwDist )/ sizeof( throwDist[0] );
   vector<StudentAttempt> dist(throwDist, throwDist + len);
   vector<StudentAttempt>::iterator it = dist.begin();

   sort( dist.begin(), dist.end(), cmpAttempts);

   for( ; it != dist.end(); it++ ) {

      CString str;

      pair<set<int>::iterator,bool> p = handled.insert(it->distance);

      if (!p.second) continue; // already handled

      if(0 < printAllEqual(dist,*it,str)) {

        cout << setw(2) << (*it).distance 
           << " feet:  " << (*it).studentName << (LPCTSTR) str << endl;
      }
   }

   
}