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Find value by key

#include <map> #include <iostream> #include <string> using namespace std; typedef map<int, string> 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] ";    }  }