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  1. #include <math.h>
  2. #include <iostream>
  3.  
  4. #define dbg(x) do { volatile auto v = x; std::cout << #x << ": " << v << std::endl; } while (0)
  5.  
  6. template<typename T> long long to_ll(T x) {
  7.   volatile T y = x;
  8.   return (long long)y;
  9. }
  10.  
  11. int main() {
  12.   volatile double x = 302500001100000001;
  13.   volatile long double y = 302500001100000001;
  14.   std::cout << std::fixed;
  15.   std::cout.precision(12);
  16.   dbg(x);
  17.   dbg(y);
  18.   dbg(sqrt(x));
  19.   dbg(sqrt(y));
  20.   dbg(to_ll(sqrt(x)));
  21.   dbg(to_ll(sqrt(y)));
  22.   dbg(sqrtl(x));
  23.   dbg(sqrtl(y));
  24.   dbg(to_ll(sqrtl(x)));
  25.   dbg(to_ll(sqrtl(y)));
  26.   return 0;
  27. }
  28.  
Success #stdin #stdout 0s 3472KB
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stdin
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Standard input is empty
stdout
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x: 302500001100000000.000000000000
y: 302500001100000001.000000000000
sqrt(x): 550000001.000000000000
sqrt(y): 550000001.000000000000
to_ll(sqrt(x)): 550000001
to_ll(sqrt(y)): 550000001
sqrtl(x): 550000000.999999999069
sqrtl(y): 550000001.000000000000
to_ll(sqrtl(x)): 550000000
to_ll(sqrtl(y)): 550000001
https://ideone.com/HUcXCB
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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