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  1. #include <iostream>
  2. #include <ios>
  3. #include <sstream>
  4.  
  5. int main()
  6. {
  7.     std::cout << std::boolalpha;
  8.     const char* inputs[] = { "14", "abc", "14a", "-14", nullptr };
  9.     for (int i = 0; inputs[i]; i++)
  10.     {
  11.         std::istringstream in(inputs[i]);
  12.         int j;
  13.  
  14.         std::cout << inputs[i]
  15.                   << " valid integer ? "
  16.                   << (in >> j && in.eof())
  17.                   << "\n";
  18.     }
  19.     return 0;
  20. }
  21.  
Success #stdin #stdout 0s 3032KB
comments (?)
stdin
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Standard input is empty
stdout
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14 valid integer ? true
abc valid integer ? false
14a valid integer ? false
-14 valid integer ? true
https://ideone.com/8bEYJq
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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