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  1. #include <iostream>
  2. #include <cmath>
  3. #include <iomanip>
  4. using namespace std;
  5.  
  6. void foo( const double d )
  7. {
  8.     const double rounded_2_decimals = std::round(d*100.0) / 100.0;
  9.     std::cout << "d=" << std::setprecision(9) <<  d << std::endl;
  10.     std::cout << "r=" << std::setprecision(9) << rounded_2_decimals << std::endl;
  11. }
  12.  
  13. int main() {
  14. 	// your code goes here
  15. 	double d = 3.1249999;
  16.  
  17.     foo(d);
  18.  
  19. 	return 0;
  20. }
Success #stdin #stdout 0s 3412KB
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Standard input is empty
stdout
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d=3.1249999
r=3.12
https://ideone.com/D8e8Aw
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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