Strange C code - dynamic arrays?

Question

I have a bit of code copied from an unknown source:

 int Len=0;
 printf(\"Please input the length of vector\");
 scanf(\"%d\",&Len);
 float x[Len],y[Len],si         


        

Answer 1

This is called a Variable Length Array (VLA) and is a C99 feature.

If your compiler does not recognise it on it's own then try switching C standards

Try:

--std=c99
-std=c99
--std=gnu99
-std=gnu99

The manual page of your compiler will be able to tell you the exact flag.