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  1. #include <iostream>
  2. #include <cmath>
  3.  
  4. #ifdef CPP11
  5.     #define ROUND(x) std::round(x)
  6. #else    /* CPP11 */
  7. inline double myRound(double x) {
  8.     return (x >= 0.0 ? std::floor(x + 0.5) : std::ceil(x - 0.5));
  9. }
  10.  
  11.     #define ROUND(x) myRound(x)
  12. #endif   /* CPP11 */
  13.  
  14.  
  15. int main()
  16. {
  17.    std::cout << "0.3 rounds to " << ROUND(0.3) << std::endl;
  18.    std::cout << "With std::round(), it's " << std::round(0.3) << std::endl;
  19.    std::cout << "-0.3 rounds to " << ROUND(-0.3) << std::endl;
  20.    std::cout << "With std::round(), it's " << std::round(-0.3) << std::endl;
  21.    std::cout << "12.8 rounds to " << ROUND(12.8) << std::endl;
  22.    std::cout << "With std::round(), it's " << std::round(12.8) << std::endl;
  23.    std::cout << "-31.6 rounds to " << ROUND(-31.6) << std::endl;
  24.    std::cout << "With std::round(), it's " << std::round(-31.6) << std::endl;
  25.  
  26.    return 0;
  27. }
  28.  
  29.  
Success #stdin #stdout 0s 3412KB
comments (?)
stdin 
Standard input is empty
stdout 
0.3 rounds to 0
With std::round(), it's 0
-0.3 rounds to -0
With std::round(), it's -0
12.8 rounds to 13
With std::round(), it's 13
-31.6 rounds to -32
With std::round(), it's -32
https://ideone.com/zal709
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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