Historically, the first extensions used for C++ were .c and .h, exactly like for C. This caused practical problems, especially the .c which didn't allow build systems to easily differentiate C++ and C files. Unix, on which C++ has been developed, has case sensitive file systems. So some used .C for C++ files.

Apr 4, 2010 · I am reading a book called "Teach Yourself C in 21 Days" (I have already learned Java and C# so I am moving at a much faster pace). I was reading the chapter on pointers and the -> (arrow) operator came up without explanation. I think that it is used to call members and functions (like the equivalent of the .

Dec 18, 2009 · In C99, the C header <math.h> defines nan(), nanf(), and nanl() that return different representations of NaN (as a double, float, and int respectively), and infinity (if avaliable) could be returned by generating one with log(0) or something. There's no standard way to check for them, even in C99.

Jun 8, 2012 · While it's an integer, the %c interprets its numeric value as a character value for display. For instance for the character a: If you used %d you'd get an integer, e.g., 97, the internal representation of the character a. vs . using %c to display the character 'a' itself (if using ASCII)

Apr 25, 2016 · what does this mean? #define WS_RECURSIVE (1 &lt;&lt; 0) I understand that it will define WS_Recursive (1 &lt;&lt; 0) but what does &lt;&lt; mean? Thanks!

Dec 22, 2014 · 0L is a long integer value with all the bits set to zero - that's generally the definition of 0.The ~ means to invert all the bits, which leaves you with a long integer with all the bits set to one.

Note the .C - case matters in GCC, .c is a C file whereas .C is a C++ file (if you let the compiler decide what it is compiling that is). GCC also supports other suffixes to indicate special handling, for example a .ii file will be compiled as C++, but not pre-processed (intended for separately pre-processed code).

– Nikos C. Commented Oct 30, 2012 at 8:37 @NikosChantziaras Perhaps at the same time you were writing your comment, I was expanding on the case of the list of types for decimal constants not containing any unsigned types, with a theory for the reason.

It can compile C, C++, and possibly other languages; it determines the language by the file extension. g++ is a driver binary like gcc , but with a few special options set for compiling C++. Notably (in my experience), g++ will link libstdc++ by default, while gcc won't.

Dec 24, 2024 · To add to what Evan said: C does not have a built-in operator for exponentiation, because it is not a primitive operation for most CPUs. Thus, it's implemented as a library function. Thus, it's implemented as a library function.