What is this header error caused by? [closed]

by

In the Sales_item class you forgot to make the isbn method public, and left it at its default private visibility.

It should, in short, read something like this:

class Sales_item
{
  public:
    return_value isbn();
}

Without the public: line it will be private by default in C++ classes.

More Related Contents:

  1. What is the difference between palindrome permutation and permutation? [closed]
  2. Why is “using namespace std;” considered bad practice?
  3. Is there a max array length limit in C++?
  4. Modulo operator with negative values [duplicate]
  5. Recursive lambda functions in C++11
  6. Comma in C/C++ macro
  7. How to convert a lambda to an std::function using templates
  8. C++ standard: dereferencing NULL pointer to get a reference? [duplicate]
  9. High resolution timer with C++ and Linux?
  10. C++11 aggregate initialization for classes with non-static member initializers
  11. CMake: How to set up source, library and CMakeLists.txt dependencies?
  12. 32-bit to 16-bit Floating Point Conversion
  13. Should one use forward declarations instead of includes wherever possible?
  14. tell cin to stop reading at newline
  15. Declaring multiple object pointers on one line causes compiler error
  16. Uses of a C++ Arithmetic Promotion Header
  17. Create an Application without a Window
  18. Assign a nullptr to a std::string is safe?
  19. Comparing strings lexicographically
  20. Easy way find uninitialized member variables
  21. Unresolved external symbol LNK2019
  22. Why can a T* be passed in register, but a unique_ptr cannot?
  23. How to enable C++17 support in VSCode C++ Extension
  24. Vector.erase(Iterator) causes bad memory access
  25. Why and how should I use namespaces in C++?
  26. Loading a file into a vector
  27. Why default three-way operator (spaceship ) generates equality operator (==) and user define three-way operator not?
  28. C++ Extract number from the middle of a string
  29. Using custom camera in OpenCV (via GStreamer)
  30. Private constructor and make_shared

Leave a Comment