std::string numberstring(const unsigned long i)
{
if( i < 20 )
{
return lessthantwentytostring(i);
}
else if ( i < 100 )
{
unsigned long tens;
tens = i/10;
return tenstostring(tens) + lessthantwentytostring(i - tens*10);
}
else if ( i < 1000 )
{
unsigned long hundreds;
hundreds = i / 100;
if ( i - hundreds*100 == 0 ) {
return numberstring(hundreds) + "hundred" + numberstring(i - hundreds*100);
} else {
return numberstring(hundreds) + "hundredand" + numberstring(i - hundreds*100);
}
}
else if ( i < 1000000 )
{
unsigned long thousands;
thousands = i / 1000;
return numberstring(thousands) + "thousand" + numberstring(i-thousands*1000);
}
else if ( i < 1000000000 )
{
long millions;
millions = i / 1000000;
return numberstring(millions) + "million" + numberstring(i-millions*1000000);
}
}
std::string decode(const std::string & to_decode) {
boost::regex e("(\\d+)(\\w)") ;
boost::match_results<std::string::const_iterator> matches ;
std::ostringstream oss ;
std::string::const_iterator start = to_decode.begin() , end = to_decode.end() ;
while(boost::regex_search(start , end , matches , e)) {
std::string numberstring(matches[1].first, matches[1].second) ;
int number = atoi(numberstring.c_str()) ;
std::string character(matches[2].first , matches[2].second) ;
for(int i = 0 ; i < number ; i++)
oss << character ;
start = matches[ 2 ].second ;
}
return oss.str() ;
}
int main(int argc, char* argv[])
{
if (argc < 1) return 0;
long i;
long start = 1;
long incr = 1;
long end;
bool newline = true;
if ( argc < 2 )
{
std::cout << "Usage: " << argv[0] << "[<start>] [<end> [<incr>]]" << std::endl;
return 1;
}
else if ( argc < 3 )
{
end = atoi(argv[1]);
// if std::string overhead is too high
// do this case "constructively"
// i.e. just iteratively construct all these
// numbers.
}
else if (argc < 4)
{
start = atoi(argv[1]);
end = atoi(argv[2]);
}
else if (argc < 5)
{
start = atoi(argv[1]);
end = atoi(argv[2]);
incr = atoi(argv[3]);
}
else
{
start = atoi(argv[1]);
end = atoi(argv[2]);
incr = atoi(argv[3]);
newline = argv[4][0] =='n';
}
for (i = start; i < end; i += incr ){
std::cout << numberstring(i);
if (newline) std::cout << std::endl;
}
return 0;
}
