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  1. #include <iostream>
  2. #include <string>
  3. #include <sstream>
  4. using namespace std;
  5. int main(int argc, char *argv[])
  6. {
  7.   string line; 
  8.   while(getline(cin, line )) { 
  9.   	cout << line<<" ---> ";
  10. 	istringstream is(line);	
  11. 	size_t processed;
  12.     string hi;
  13.     double hello;
  14.     is >> hi;
  15.  
  16. 	try {
  17. 		hello = stod(hi,&processed); 
  18.     	cout<<"number:" <<hello; 
  19.     	if (processed<hi.size()) 
  20.     		cout << " (followed by something)";
  21.         cout <<endl; 
  22.     }
  23.     catch (...) 
  24.     {
  25.         cout <<"string: "<< hi << endl;
  26.     }
  27.  
  28.   }
  29.   cout << "Done!" << endl;
  30. }
  31.  
Success #stdin #stdout 0s 4280KB
comments (?)
stdin 
123
123abc456
-123
+123
xyz
/123
++123
+ 123
++++123abc234
stdout 
123 ---> number:123
123abc456 ---> number:123 (followed by something)
-123 ---> number:-123
+123 ---> number:123
xyz ---> string: xyz
/123 ---> string: /123
++123 ---> string: ++123
+ 123 ---> string: +
++++123abc234 ---> string: ++++123abc234
Done!
https://ideone.com/N2GcyD
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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