Map Multimap C++ Tutorial

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#include 
#include 
#include 
using namespace std;
typedef map INT2STRING;
int main(void){
   INT2STRING theMap;
   INT2STRING::iterator theIterator;
   string theString = "One, Two";
   int index= 1;
   theMap.insert(INT2STRING::value_type(0,"Zero"));
   theMap.insert(INT2STRING::value_type(1,"One"));
   theMap.insert(INT2STRING::value_type(2,"Two"));
   theMap.insert(INT2STRING::value_type(3,"Three"));
   theMap.insert(INT2STRING::value_type(4,"Four"));
   theMap.insert(INT2STRING::value_type(5,"Five"));
   theMap.insert(INT2STRING::value_type(6,"Six"));
   theMap.insert(INT2STRING::value_type(7,"Seven"));
   theMap.insert(INT2STRING::value_type(8,"Eight"));
   theMap.insert(INT2STRING::value_type(9,"Nine"));
   for( index = 0; index < theString.length(); index++){
      theIterator = theMap.find(theString[index] - '0');
      if(theIterator != theMap.end())      // is 0 - 9
        cout << (*theIterator).second << " ";
      else                // not 0 - 9
        cout << "[err] ";
   }
 }