A fine question, but a little too broad (IMO). That's called the scope-resolution operator, and your search term for further learning is scope. All those names (cout, member functions of A) are …

I am a C guy and I'm trying to understand some C++ code. I have the following function declaration:

May 17, 2009 · The .cpp file is the compilation unit: it's the real source code file that will be compiled (in C++). The .h (header) files are files that will be virtually copied/pasted in the .cpp …

Sep 3, 2013 · What is the difference between .cc and .cpp file extensions? From Google, I learned that they are both from the C++ language, but I am unsure of differences between them.

95 .cpp is the recommended extension for C++ as far as I know. Some people even recommend using .hpp for C++ headers, just to differentiate from C. Although the compiler doesn't care …

Nov 24, 2017 · This is called the three-way comparison operator. According to the P0515 paper proposal: There’s a new three-way comparison operator, <=>. The expression a <=> b returns …

Is there a way to find how many values an array has? Detecting whether or not I've reached the end of an array would also work.

If you're looking for a way of applying the static keyword to a class, like you can in C# for example, then you won't be able to without using Managed C++. But the looks of your sample, …

This is similar to how one would write a prototype for functions in a header file and then define the functions in a .cpp file. A function prototype is a function without a body and lets the compiler …

Nov 13, 2009 · I want to use the PI constant and trigonometric functions in some C++ program. I get the trigonometric functions with include &lt;math.h&gt;. However, there doesn't seem to be …