Why does auto a=1; compile in C?

Why does auto a=1; compile in C?

c auto c11

c

Why does "sizeof(a ? true : false)" give an output of four bytes?

c boolean sizeof conditional-operator c11

c

Printing null pointers with %p is undefined behavior?

c language-lawyer c99 undefined-behavior c11

c

Syntax and Sample Usage of _Generic in C11

c generics c11

c

What is C17 and what changes have been made to the language?

c gcc iso c11 c17

c

Why does "noreturn" function return?

c assembly c11 function-call noreturn

c

Multi-Threading support in c11

c multithreading c11

c

What is the default C -std standard version for the current GCC (especially on Ubuntu)?

c ubuntu gcc c99 c11

c

Is type-punning through a union unspecified in C99, and has it become specified in C11?

c c99 unions c11 type-punning

c

Does any C library implement C11 threads for GNU/Linux?

c multithreading c11

c

When are anonymous structs and unions useful in C11?

c struct c11

c

Does &((struct name *)NULL -> b) cause undefined behaviour in C11?

c language-lawyer c11 offsetof

c

Are there any plans for a future C standard after C11?

c iso c11

c

Why does C++11 not support anonymous structs, while C11 does?

c++ c c++11 anonymous-types c11

c

How to enable c11 on later versions of gcc?

c gcc c11

c