can size of array be determined at run time in c?

Question

As I know, an array needs to have a specific size before compiling time in c.

I wonder why this code still works?

int s;
printf(\"enter the array si         


        

Answer 1

This code is supported by C99 language specification. This code is also supported by GCC compiler in C89/90 mode as an extension.

So, the answer to your question (why it "works") depends on how you are compiling it. In general case, this will not even compile by a C89/90 compiler.