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  1. #include <iostream>
  2. #include <locale>
  3. #include <string>
  4. #include <cmath>
  5.  
  6. // a num_put facet to add a padding space for positive numbers
  7. class sign_padding :public std::num_put<char> {
  8. public:
  9.     // only for float and double
  10.     iter_type do_put(iter_type s, std::ios_base& f,
  11.                      char_type fill, double v) const
  12.     {
  13.         if (std::signbit(v) == false)
  14.             *s++ = ' ';
  15.         return std::num_put<char>::do_put(s, f, fill, v);
  16.     }
  17. };
  18.  
  19. int main()
  20. {
  21. 	// add the facet to std::cout
  22.     std::cout.imbue(std::locale(std::cout.getloc(), new sign_padding));
  23.  
  24.     // now print what you want to print
  25.     std::cout << -56.0f << "\n"
  26.               << +56.0f << "\n"
  27.               << -0.0f << "\n"
  28.               << +0.0f << "\n";
  29.  
  30.     // output:
  31.     // -56
  32.     //  56
  33.     // -0
  34.     //  0
  35. }
  36.  
Success #stdin #stdout 0s 15240KB
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stdin
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Standard input is empty
stdout
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-56
 56
-0
 0
https://ideone.com/hpie1V
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
secret

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