C Variable Types/ "#define"

[matmatmat]

Is there a way to get the type of a variable?
Is there a way to use if's with defines

[jespdj]

No, C does not have a standard runtime type information mechanism.

What do you mean with your second question? There's #ifdef, see Conditional Syntax (http://gcc.gnu.org/onlinedocs/cpp/Conditional-Syntax.html#Conditional-Syntax) in the GCC manual.

[matmatmat]

Does that mean there is also no way to get the length of a variable?

[MadCow108]

you can get the length of a varable type in bytes with sizeof(type)

but use with care when using it with arrays.
you'll mostly get the size of the pointer not the size of the array.