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#include <iostream>

using namespace std;

istream& get_number( istream& is, int& n )
{
  while ( is && !isdigit( static_cast<unsigned char>( is.get() ) ) )
    ;
  is.unget();
  return is >> n;
}

int main()
{
  int n;
  while ( get_number( cin, n ) )
    cout << n << ' ';
}
Success #stdin #stdout 0s 4476KB
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stdin
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Hello 1234 World 9876 Hello1234
stdout
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1234 9876 1234
https://ideone.com/vrvwgl
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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