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  1. #include <iostream>
  2. #include <iomanip>
  3. #include <sstream>
  4. #include <vector>
  5.  
  6. int main()
  7. {
  8.     std::vector<double> numbers {
  9.     	3.141516, 1.01, 200.78901, 0.12345, 9.99999
  10.     };
  11.  
  12.     for (auto x : numbers)
  13.     {
  14.     	// "print" the number
  15.     	std::stringstream ss;
  16.     	ss << std::fixed << std::setprecision(4) << x;
  17.  
  18.     	// remove the unwanted zeroes
  19.     	std::string result{ss.str()};
  20.     	while (result.back() == '0')
  21.     		result.pop_back();
  22.  
  23.     	// remove the separator if needed	
  24.     	if (result.back() == '.')
  25.     		result.pop_back();
  26.  
  27.         std::cout << result  << '\n';
  28.     }
  29.  
  30.     std::cout << "\nJustified:\n";
  31.     for (auto x : numbers)
  32.     {
  33.     	// "print" the number
  34.     	std::stringstream ss;
  35.     	ss << std::fixed << std::setprecision(4) << std::setw(15) << x;
  36.  
  37.     	// remove the unwanted zeroes
  38.     	std::string result{ss.str()};
  39.     	auto it = result.rbegin();
  40.     	while (*it == '0')
  41.     		*it++ = ' ';
  42.  
  43.     	// remove the separator if needed	
  44.     	if (*it == '.')
  45.     		*it = ' ';
  46.  
  47.         std::cout << result  << '\n';
  48.     }
  49. }
Success #stdin #stdout 0s 15240KB
comments (?)
stdin 
Standard input is empty
stdout 
3.1415
1.01
200.789
0.1235
10

Justified:
         3.1415
         1.01  
       200.789 
         0.1235
        10
https://ideone.com/8zP17O
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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