title: Digit separator in C
body: <p>I have been able to use the digit-separator <code>'</code> in my C projects thus far. They have all been compiled with the MSVC compiler with no problems.</p>
  
  <p>I have just changed to using the GCC compiler instead, which does not allow these digit-separators and throws an error, when I use them. I assume the reason is because, Visual Studio uses the same compiler for C and C++, and in C++14 (I believe), <code>'</code> digit separators are allowed.</p>
  
  <p>If this is the case, is there then a digit separator usable in GCC? 
  Those separators really help out a lot, when working with 64 bit register values in binary...</p>