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#include <iostream>

void f() {
  int i, j;
  std::cin >> i >> j;
  // ...
}

Implementation Details

For instance, if the text 12345678901234567890 is the first converted value read from the standard input stream, then i will have the value std::numeric_limits<int>::max() (per [facet.num.get.virtuals] paragraph 3), and j will be uninitialized (per [istream.formatted.arithmetic] paragraph 3). If the text abcdefg is the first converted value read from the standard input stream, then i will have the value 0 and j will remain uninitialized.

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