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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. enum IP_family {
  5. 	addr_IPv4,
  6. 	addr_IPv6,
  7. 	addr_unknown
  8. };
  9.  
  10. const char *to_string (IP_family f) {
  11. 	switch (f) {
  12. 	case addr_IPv6:
  13. 		return "IPv6";
  14. 	case addr_IPv4:
  15. 		return "IPv4";
  16. 	default:
  17. 		return "unknown";
  18. 	}
  19. }
  20.  
  21. IP_family addr_type (const string &addr) {
  22. 	if (addr.find_first_of (':') != string::npos)
  23. 		return addr_IPv6;
  24. 	if (addr.find_first_of ('.') != string::npos)
  25. 		return addr_IPv4;
  26. 	return addr_unknown;
  27. }
  28.  
  29. ostream &operator<< (ostream &os, IP_family f) {
  30. 	return os << to_string (f);
  31. }
  32.  
  33. void test (const string &str) {
  34. 	cout << "\"" << str << "\" is " << addr_type(str) << endl;
  35. }
  36.  
  37. int main() {
  38. 	test ("46.227.16.8");
  39. 	test ("2a01:6e00:10:410::2");
  40. 	test ("42");
  41. 	return 0;
  42. }
  43.  
Success #stdin #stdout 0s 3460KB
comments (?)
stdin
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Standard input is empty
stdout
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"46.227.16.8" is IPv4
"2a01:6e00:10:410::2" is IPv6
"42" is unknown
https://ideone.com/jG8yYv
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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