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  1. #include <iostream>
  2. #include <cstdlib>
  3. #include <string>
  4.  
  5. using namespace std;
  6. class greet
  7. {
  8.    public:
  9.  
  10.       void hello(string name)
  11.       {
  12.          cout << "Hello, " + name + "!" << endl;
  13.       }
  14. };
  15.  
  16. int main()
  17. {
  18.    greet user;
  19.    char const* name = std::getenv("USER");
  20.    user.hello(name);
  21.    return 0;
  22. }
Runtime error #stdin #stdout #stderr 0s 16064KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
stderr
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terminate called after throwing an instance of 'std::logic_error'
  what():  basic_string::_M_construct null not valid
https://ideone.com/Y48u7X
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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