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  1. #include <iostream>
  2. #include <limits>
  3.  
  4. int main()
  5. {
  6.   using namespace std;
  7.  
  8.   int n;
  9.   while ( !( cin >> n ) || n < 0 )
  10.   {
  11.     cout << "Bad input" << endl;
  12.     cin.clear();
  13.     cin.ignore( numeric_limits<std::streamsize>::max(), '\n' );
  14.   }
  15.  
  16.   cout << "You entered: " << n;
  17.  
  18.   return 0;
  19. }
  20.  
Success #stdin #stdout 0s 15232KB
comments (?)
stdin 
abc
-123
123
stdout 
Bad input
Bad input
You entered: 123
https://ideone.com/vs2fGY
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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