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  1. #include <iostream>
  2. #include <iomanip>
  3. #include <sstream>
  4.  
  5. class MyFloat
  6. {
  7. public:
  8.     MyFloat(float val = 0) : _val(val)
  9.     {}
  10.  
  11.     friend std::ostream& operator<<(std::ostream& os, const MyFloat& rhs)
  12.     { os << MyFloat::noLeadingZero(rhs._val, os); }
  13.  
  14. private:
  15.     static std::string noLeadingZero(float val, std::ostream& os)
  16.     {
  17.         std::stringstream ss;
  18.         ss.copyfmt(os);
  19.         ss << val;
  20.         std::string str = ss.str();
  21.  
  22.         if(val > 0.f && val < 1.f)
  23.             return str.substr(1, str.size()-1);
  24.         else if(val < 0.f && val > -1.f)
  25.             return "-" + str.substr(2, str.size()-1);
  26.  
  27.         return str;
  28.     }
  29.     float _val;
  30. };
  31.  
  32. int main()
  33. {
  34. 	std::cout << "Value: " << std::setw(2) << std::setprecision(1);
  35. 	std::cout << std::fixed << MyFloat(0.357765);
  36.  
  37. 	return 0;	
  38. }
Success #stdin #stdout 0s 3432KB
comments (?)
stdin 
Standard input is empty
stdout 
Value: .4
https://ideone.com/E1mPL4
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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