string concatenation and output to external program

[ChurchedAtheist]

scraped the old code, as I have largely redone the code.

#include <iostream>
#define NOMINMAX
#include <windows.h>
#include <string.h>
#include <sstream>

using namespace std;

int main ()
{
	int chapter;
	int section;
	int prob_number;

  cout << "What chapter is this? :";
cin >> chapter;
cout << "What section is this? :";
cin >> section;
cout << "What problem is this? :";
cin >> prob_number;

string sectionletter;
switch (section){
  case 1:
    sectionletter = "a";
    break;
  case 2:
    sectionletter = "b";
    break;
  case 3:
    sectionletter = "c";
    break;
  case 4:
    sectionletter = "d";
    break;
  case 5:
    sectionletter = "e";
    break;
  case 6:
    sectionletter = "f";
    break;
  case 7:
    sectionletter = "g";
    break;
  case 8:
    sectionletter = "h";
    break;
  case 9:
    sectionletter = "i";
    break;
  case 10:
    sectionletter = "j";
    break;
  case 11:
    sectionletter = "k";
    break;
  case 12:
    sectionletter = "l";
    break;
  case 13:
    sectionletter = "m";
    break;
  default:
    sectionletter = "0";
}


string result1;
stringstream tbuf1;
tbuf1.width(3);
  tbuf1 << right << prob_number;
tbuf1 >> result1;

string result2;
stringstream tbuf2;
tbuf2.width(2);
  tbuf2 << right << chapter;
tbuf2 >> result2;

string urllink = "http://calcchat.tdlc.com/solutionart/calc9e/"+result2+"/"+sectionletter+"/se"+result2+sectionletter+"010"+result1+".png";

ShellExecuteA(NULL, "open", urllink.c_str(), NULL, NULL, SW_SHOWNORMAL);
  return 0;
}

using seperate stringstreams for prob_number and chapter gets me 404 Not Found

just need the 0 out front