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  1. #include <iostream>
  2.  
  3. using std::cout;
  4. using std::string;
  5. using std::endl;
  6.  
  7. string toWords(int num) {
  8.   if (num > 100 || num < 1) {
  9.     throw "unsupported";
  10.   }
  11.   if (num == 100) {
  12.     return "one hundred";
  13.   }
  14.  
  15.   const string kSpecialCases[] = {"ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen"};
  16.   if (10 <= num && num <= 19) {
  17.     return kSpecialCases[num - 10];
  18.   }
  19.  
  20.   const string kOnesPlaces[] = {"one", "two", "three", "four", "five", "six", "seven", "eight", "nine"};
  21.   const string kTensPlaces[] = {"twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety"};
  22.   if (num < 10) {
  23.     return kOnesPlaces[num - 1];
  24.   } else if (num % 10 == 0) {
  25.     return kTensPlaces[num / 10 - 2];
  26.   } else {
  27.     return kTensPlaces[num / 10 - 2] + " " + kOnesPlaces[num % 10 - 1];
  28.   }
  29. }
  30.  
  31. int main() {
  32.   cout << toWords(1) << endl;
  33.   cout << toWords(100) << endl;
  34.   cout << toWords(12) << endl;
  35.   cout << toWords(29) << endl;
  36.   cout << toWords(46) << endl;
  37.   return 0;
  38. }
Success #stdin #stdout 0s 3432KB
comments (?)
stdin
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Standard input is empty
stdout
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one
one hundred
twelve
twenty nine
forty six
https://ideone.com/44IB0J
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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