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  1. #include <iostream>
  2. #include <limits>
  3. #include <locale>
  4. struct space_out : std::numpunct<char> {
  5.     char do_thousands_sep()   const { return ' '; }   // separate with spaces
  6.     std::string do_grouping() const { return "\1"; } // groups of 1 digit
  7. };
  8. int main()
  9. {
  10.     int n;
  11.     while(!(    std::cout << "Enter a three-digit integer: "
  12.              && std::cin >> n
  13.              && n > 99 && n < 1000))
  14.     {
  15.         std::cin.clear();
  16.         std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
  17.         std::cout << "This was not a three-digit integer, try again\n";
  18.     }
  19.  
  20.     std::cout.imbue(std::locale(std::cout.getloc(), new space_out));
  21.     std::cout << n << '\n';
  22. }
  23.  
Success #stdin #stdout 0s 3036KB
comments (?)
stdin 
549
stdout 
Enter a three-digit integer: 5 4 9
https://ideone.com/mDUf6Q
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
secret

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