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  1. #include <iostream>
  2. #include <locale>
  3.  
  4. struct threes : std::numpunct<char>
  5. {
  6.     std::string do_grouping() const { return "\3"; }
  7. };
  8.  
  9. int main()
  10. {
  11.     std::cout.imbue(std::locale(std::cout.getloc(), new threes));
  12.     std::cout << 123456789 << '\n';
  13. }
  14.  
Success #stdin #stdout 0s 3432KB
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stdin
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Standard input is empty
stdout
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123,456,789
https://ideone.com/ofwymf
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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