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  1. #include <iostream>
  2. #include <fstream>
  3. #include <limits>
  4. using namespace std;
  5. int main()
  6. {
  7.     int num;
  8.     do {
  9.         cout << "How many:\n";
  10.         cin >> num;
  11.         if(!cin)
  12.         {
  13.             cout << "This wasn't even a number!\n";
  14.             cin.clear();
  15.             cin.ignore(numeric_limits<streamsize>::max(), '\n');
  16.         }
  17.     } while (num<1 || num>3);
  18.     cout << "You've entered " << num << '\n';
  19. }
  20.  
Success #stdin #stdout 0s 2728KB
comments (?)
stdin
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-1
100
foo
5
2
stdout
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How many:
How many:
How many:
This wasn't even a number!
How many:
How many:
You've entered 2
https://ideone.com/LTPtS
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
public

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