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  1.  
  2. #include <iostream>
  3. #include <string>
  4. #include <sstream>
  5.  
  6. int main() {
  7.  
  8. 	using namespace std;
  9.  
  10. 	std::istringstream iss("0");
  11. 	double d;
  12.  
  13. 	if (iss >> d)
  14. 	{
  15. 		cout << "number: " << d << endl;
  16. 	} else {
  17. 		cout << "NaN: " << d << endl;
  18. 	}
  19.  
  20. }
Success #stdin #stdout 0.01s 2860KB
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Standard input is empty
stdout
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number: 0
https://ideone.com/3Ykmi
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
public

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