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  1. #include <iostream>
  2. #include <fstream>
  3. #include <string>
  4. #include <sstream>
  5. #include <limits>
  6.  
  7. void do_without_exceptions()
  8. {
  9.     std::istringstream in("3 4\n5 6\nbad line\n10 39\n100 1001\nbad line");
  10.  
  11.     while (in.good())
  12.     {
  13.         int a, b;
  14.         while (in >> a >> b)
  15.             std::cout << a << " + " << b << " = " << a + b << '\n';
  16.  
  17.         if (!in)
  18.         {
  19.             in.clear();
  20.             in.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
  21.         }
  22.     }
  23. }
  24.  
  25. void do_with_exceptions()
  26. {
  27. 	auto exception_bits = std::istringstream::badbit |
  28. 	                      std::istringstream::failbit |
  29. 	                      std::istringstream::eofbit;
  30.  
  31.     std::istringstream in("3 4\n5 6\nbad line\n10 39\n100 1001\nbad line");
  32.     in.exceptions(exception_bits);
  33.  
  34.     while (in.good())
  35.     {
  36.         try {
  37.             int a, b;
  38.             in >> a >> b;
  39.             std::cout << a << " + " << b << " = " << a + b << '\n';
  40.         }
  41.  
  42.         catch (std::istream::failure& ex)
  43.         {
  44.             if (in.fail())
  45.             {
  46.                 try {
  47.                     in.clear();
  48.                     in.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
  49.                 }
  50.  
  51.                 catch (std::istream::failure&)
  52.                 {
  53.                 }
  54.             }
  55.         }
  56.     }
  57. }
  58.  
  59.  
  60. int main(int argc, char* argv[])
  61. {
  62.     do_without_exceptions();
  63.     do_with_exceptions();
  64. }
Success #stdin #stdout 0s 3432KB
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stdin
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Standard input is empty
stdout
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3 + 4 = 7
5 + 6 = 11
10 + 39 = 49
100 + 1001 = 1101
3 + 4 = 7
5 + 6 = 11
10 + 39 = 49
100 + 1001 = 1101
https://ideone.com/DVZDeD
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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