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  1. #include <iostream>
  2. #include <iomanip>
  3.  
  4. void print_bytes(char const *name, double d)
  5. {
  6. 	unsigned char *pd = reinterpret_cast<unsigned char*>(&d);
  7.     std::cout << name << " = " << std::setw(2) << d << " => ";
  8.     for(int i = 0 ; i < sizeof(d) ; ++i)
  9.        std::cout << std::setw(-3) << (unsigned)pd[i] << " ";
  10.     std::cout << std::endl;
  11. }
  12.  
  13. #define print_bytes_of(a) print_bytes(#a, a)
  14.  
  15. int main()
  16. {
  17.     double a = 0.0;
  18.     double b = -0.0;
  19.  
  20.     std::cout << "Value comparison" << std::endl;
  21.     std::cout << "(a==b) => " << (a==b)  <<std::endl;
  22.     std::cout << "(a!=b) => " << (a!=b)  <<std::endl;
  23.  
  24.  
  25.     std::cout << "\nValue representation" << std::endl;
  26.     print_bytes_of(a);
  27.     print_bytes_of(b);
  28. }
Success #stdin #stdout 0s 3340KB
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stdin
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Standard input is empty
stdout
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Value comparison
(a==b) => 1
(a!=b) => 0

Value representation
a =  0 => 0 0 0 0 0 0 0 0 
b = -0 => 0 0 0 0 0 0 0 128
https://ideone.com/0dR33z
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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