/******************************************** --this program converts a number in words to digits. --each word should be well distinct ie separated with spaces; eg input >> twenty three. output >> 23 --note should also be taken that numbers greater than or equal to 1 billion may not be converted properly because the c++ standard limits ints to 4 bytes that is aproximately 4*8 = 32 bits --hence max number should be aproximately 2^32 = 1.7E10. --so for safety reasons, enter numbers in words less than 1 billion. code by Germain .F last edited: 12/02/18 bugs sited : none. @Synovicc Ink ********************************************/ #include #include #include #include #include #include #include #include //using namespace std; namespace WTN { typedef std::map m_si; class WordToNumber { public: WordToNumber(std::string txt = "one million three hundred and twenty thousand") { std::cout<<"\nin words >> "<("billion",1000000000)); begins_with_f.insert(std::pair("four",4)); begins_with_f.insert(std::pair("forty",40)); begins_with_f.insert(std::pair("fourteen",14)); begins_with_f.insert(std::pair("five",5)); begins_with_f.insert(std::pair("fifteen",15)); begins_with_f.insert(std::pair("fifty",50)); begins_with_s.insert(std::pair("six",6)); begins_with_s.insert(std::pair("sixteen",16)); begins_with_s.insert(std::pair("sixty",60)); begins_with_s.insert(std::pair("seven",7)); begins_with_s.insert(std::pair("seventeen",17)); begins_with_s.insert(std::pair("seventy",70)); begins_with_h.insert(std::pair("hundred",100)); begins_with_m.insert(std::pair("million",1000000)); begins_with_e.insert(std::pair("eight",8)); begins_with_e.insert(std::pair("eighteen",18)); begins_with_e.insert(std::pair("eighty",80)); begins_with_e.insert(std::pair("eleven",11)); begins_with_t.insert(std::pair("two",2)); begins_with_t.insert(std::pair("twelve",12)); begins_with_t.insert(std::pair("twenty",20)); begins_with_t.insert(std::pair("three",3)); begins_with_t.insert(std::pair("thirteen",13)); begins_with_t.insert(std::pair("thirty",30)); begins_with_t.insert(std::pair("ten",10)); begins_with_t.insert(std::pair("thousand",1000)); begins_with_n.insert(std::pair("nine",9)); begins_with_n.insert(std::pair("nineteen",19)); begins_with_n.insert(std::pair("ninety",90)); begins_with_o.insert(std::pair("one",1)); start_conversion(); }//end ctor void start_conversion(){ if(iss.good()/*static_cast(&iss) != 0*/) { std::string txt; char ltr; do{ iss>>txt; //read first letter ltr = *(txt.begin()); switch(ltr){ case 'o': if(!begins_with_o[txt]){ std::cout<<"error! check spelling of '"< val) val *= begins_with_t[txt]; num_tokens.back() = val + rem; } else if(txt != "thousand"&& num_tokens.empty()) num_tokens.push_back(begins_with_t[txt]); else num_tokens.back() += begins_with_t[txt]; break; case 'm': if(!begins_with_m[txt]){ std::cout<<"error! check spelling of '"<(&iss) != 0*/);//end do-while }//end if }//end start_conversion int getToNumber()const{ //auto numb = num_tokens.back();//std::accumulate(num_tokens.begin(),num_tokens.end(),0); // if( numb >= 3000000000){ // std::cout<<"number is too larger than c++'s int limit. enter number <= 2 billion\n"; // return 0; // } return std::accumulate(num_tokens.begin(),num_tokens.end(),0); }//end getToNumber void set_str(std::string txt){ iss.str(lower_case(txt)); } private: std::istringstream iss; std::vector num_tokens; WTN::m_si begins_with_o; WTN::m_si begins_with_t; WTN::m_si begins_with_f; WTN::m_si begins_with_s; WTN::m_si begins_with_e; WTN::m_si begins_with_n; WTN::m_si begins_with_h; WTN::m_si begins_with_m; WTN::m_si begins_with_b; std::string lower_case(std::string txt){ std::for_each(txt.begin(),txt.end(),[](char& ch){ ch = tolower(ch); });//lambda expression return txt; }//end of lower_case };//end class //default obj // WordToNumber wordObj; }//end of namespace int main() { std::string txt; getline(std::cin,txt); if(static_cast(*(--txt.end())) == 32) txt = txt.erase((--txt.end()-txt.begin()),1); WTN::WordToNumber wordObj(txt); wordObj.start_conversion(); auto toNum = wordObj.getToNumber(); (toNum == -1? std::cout<<"" : std::cout<<"\nin digits >> "<

Words To Number Converter