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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.     string hi;
  12.     double hello;
  13.     is >> hello;
  14.  
  15.     if (!is)
  16.     {
  17.         //Strings go here
  18.  
  19.         is.clear();
  20.         is >> hi;
  21.         cout<<"str: "<< hi << endl;
  22.     }
  23.     else
  24.     {
  25.         cout <<"number: "<< hello << endl;
  26.     }
  27.  
  28.   }
  29.   cout << "Done!" << endl;
  30. }
  31.  
Success #stdin #stdout 0s 4280KB
comments (?)
stdin
copy 
123
123abc456
-123
+123
xyz
/123
++123
+ 123
++++123abc234
stdout
copy 
123 ---> number: 123
123abc456 ---> number: 123
-123 ---> number: -123
+123 ---> number: 123
xyz ---> str: xyz
/123 ---> str: /123
++123 ---> str: +123
+ 123 ---> str: 123
++++123abc234 ---> str: +++123abc234
 ---> str: 
 ---> str: 
 ---> str: 
Done!
https://ideone.com/O6s3c8
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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