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  1. #include <iostream>
  2. #include <sstream>
  3. #include <string>
  4. using namespace std;
  5.  
  6. int main() {
  7.  
  8. 	double tmp;
  9. 	string str = "123.456";
  10. 	stringstream ss;
  11.  
  12. 	ss << str;
  13. 	ss >> tmp;
  14.  
  15. 	if (ss.fail())
  16. 	{
  17. 	    // non-numeric string
  18. 	    cout<<"no"<<endl;
  19. 	}
  20. 	else
  21. 	{
  22. 		cout<< "success: " <<tmp<<endl;
  23. 	    // string to double conversion is successful
  24. 	}
  25. 	return 0;
  26. }
Success #stdin #stdout 0s 3472KB
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stdin
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Standard input is empty
stdout
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success: 123.456
https://ideone.com/pMk8wg
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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