//In Computer work to 999999999 //In mobile work to 186 //Challenge Accepted #include #include #include const std::vector first14 = {"zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten", "eleven", "twelve", "thirteen", "fourteen" }; const std::vector prefixes = {"twen", "thir", "for", "fif", "six", "seven", "eigh", "nine"}; std::string inttostr( const unsigned int number ) { if( number <= 14 ) return first14.at(number); if( number < 20 ) return prefixes.at(number-12) + "teen"; if( number < 100 ) { unsigned int remainder = number - (static_cast(number/10)*10); return prefixes.at(number/10-2) + (0 != remainder ? "ty " + inttostr(remainder) : "ty"); } if( number < 1000 ) { unsigned int remainder = number - (static_cast(number/100)*100); return first14.at(number/100) + (0 != remainder ? " hundred " + inttostr(remainder) : " hundred"); } if( number < 1000000 ) { unsigned int thousands = static_cast(number/1000); unsigned int remainder = number - (thousands*1000); return inttostr(thousands) + (0 != remainder ? " thousand " + inttostr(remainder) : " thousand"); } if( number < 1000000000 ) { unsigned int millions = static_cast(number/1000000); unsigned int remainder = number - (millions*1000000); return inttostr(millions) + (0 != remainder ? " million " + inttostr(remainder) : " million"); } throw std::out_of_range("inttostr() value too large"); } int main() { try { for( int i = 0; i <= 999999999; i++ ) std::cout << i << " = " << inttostr(i) << std::endl; } catch( std::exception& ex ) { std::cerr << "Error: " << ex.what() << std::endl; } return 0; }

Number to Text convertor (Challenge)