he guarantee you get is that sizeof(char) == 1. There are no other guarantees, including no guarantee that sizeof(int *) == sizeof(double *). In practice, pointers will be size 2 on a 16-bit system (if you can find one), 4 on a 32-bit system, and 8 on a 64-bit system, but there’s nothing to be gained in … Read more
If you have access to the C++ 11 libraries, check out the std::chrono library. You can use it to get the milliseconds since the Unix Epoch like this:
In theory, it may be possible to develop a self-hosting version of Emscripten that runs in a browser, though this hasn’t been done yet. Alternatively, it is possible to run a C++ compiler (or even an entire operating system) using an x86 emulator in JavaScript.
The problem is that you declared operator>> and operator<< as non-member functions, but defined as a member function. This should fix that problem (but open another set of problems). So instead of implement as : Also, take a note that you declared functions as : but defined as (therefore you changed the signature) : Proper way is to declare … Read more
But as usual, you are probably better off using a std::vector of pointers.
You have to specify the default values for the arguments only in the declaration but not in the definition. The default value for an member function’s argument can either go in declaration or definition but not both. Quote from ISO/IEC 14882:2003(E) 8.3.6 6) Except for member functions of class templates, the default arguments in a … Read more
As @Pete Becker points out in the comments, you need to qualify the name string as std::string: The compiler just doesn’t know what you’re talking about, and it’s the equivalent of just writing: The compiler just doesn’t know what type that is unless you’ve declared, hence the error missing type specifier – int assumed You should read up … Read more
Copy a file in a sane way: This is so simple and intuitive to read it is worth the extra cost. If we were doing it a lot, better to fall back on OS calls to the file system. I am sure boost has a copy file method in its filesystem class. There is a C method … Read more
The issue is that you’re declaring a local grades array with a size of 1, hiding the global grades array. Not only that, you are now accessing the array beyond the bounds, since the local grades array can only hold 1 item. So get rid of the line: However, it needs to be mentioned that this: is not valid C++ syntax. … Read more
he typical way to check for existence in many STL containers such as std::map, std::set, … is: