c - What kind of data type is "long long"?

Question

I don't know this type. Is that the biggest one from all? I think it is an integer type, right? Or is it a floating point thing? Bigger than double?

Answer 1

According to C99 standard, long long is an integer type which is at least 64-bit wide. There are two integer 64-bit types specified: long long int and unsigned long long int

So, yes, this is the biggest integer type specified by C language standard (C99 version).

There is also long double type specified by C99. It's an extended precision floating point numeric data type long for 80-bits on most popular x86-based platforms and implementations of C language.