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  1. #include <iostream>
  2. #include <iomanip>
  3. using namespace std;
  4.  
  5. int main()
  6. {
  7. constexpr double a=1e-9;
  8. cout << fixed << setprecision(18) << a << endl;
  9. return 0;
  10. }
Success #stdin #stdout 0s 3460KB
stdin
Standard input is empty
stdout
0.000000001000000000