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  1. #include <iostream>
  2. #include <string>
  3. #include <sstream>
  4. #include <iomanip>
  5. #include <cstdint>
  6. #include <vector>
  7.  
  8. std::string format_commas(uint64_t value)
  9. {
  10.     std::stringstream ss;
  11.     std::vector<uint16_t> parts;
  12.     do {
  13.         parts.push_back(short(value % 1000));
  14.         value /= 1000;
  15.     } while (value > 0);
  16.     for (std::vector<uint16_t>::reverse_iterator i = parts.rbegin(); i != parts.rend(); ++i) {
  17.         if (i != parts.rbegin())
  18.             ss << std::setw(3) << std::setfill('0');
  19.         ss << *i;
  20.         if (i + 1 != parts.rend())
  21.             ss << ',';
  22.     }
  23.     return ss.str();
  24. }
  25.  
  26. std::string format_commas_2(uint64_t value)
  27. {
  28.     std::string result;
  29.     std::stringstream ss;
  30.     std::vector<int> parts;
  31.     do {
  32.         parts.push_back(value % 1000);
  33.         value /= 1000;
  34.     } while (value > 0);
  35.     for (std::vector<int>::reverse_iterator i = parts.rbegin(); i != parts.rend(); ++i) {
  36.         if (i != parts.rbegin())
  37.             ss << std::setw(3) << std::setfill('0');
  38.         ss << *i;
  39.         if (i + 1 != parts.rend())
  40.             ss << ',';
  41.     }
  42.     result = ss.str();
  43.     return result;
  44. }
  45.  
  46. int main()
  47. {
  48.     std::cout << '(' << format_commas(0) << ')' << std::endl;
  49.     std::cout << '(' << format_commas(8) << ')' << std::endl;
  50.     std::cout << '(' << format_commas(18) << ')' << std::endl;
  51.     std::cout << '(' << format_commas(128) << ')' << std::endl;
  52.     std::cout << '(' << format_commas(1238) << ')' << std::endl;
  53.     std::cout << '(' << format_commas(12348) << ')' << std::endl;
  54.     std::cout << '(' << format_commas(123458) << ')' << std::endl;
  55.     std::cout << '(' << format_commas(1234568) << ')' << std::endl;
  56. }
  57.  
Success #stdin #stdout 0s 3036KB
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stdin
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Standard input is empty
stdout
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(0)
(8)
(18)
(128)
(1,238)
(12,348)
(123,458)
(1,234,568)
https://ideone.com/phdQmA
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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