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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int &f(int n = -1)
  5. {
  6.     static int c;
  7.     if (n >= 0) {
  8.         c = n * 10;
  9.     }
  10.     return c;
  11. }
  12.  
  13. int main()
  14. {
  15.     cout << f(1) << endl;
  16.     cout << f() << endl;
  17.     f() = 2;
  18.     cout << f() << endl;
  19.     f(3);
  20.     cout << f() << endl;
  21.     return 0;
  22. }
  23.  
Success #stdin #stdout 0s 3296KB
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stdin
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Standard input is empty
stdout
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10
10
2
30
https://ideone.com/cHrxVU
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

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