How does sizeof know the size of the operand array?

Question

This may be a stupid question but how does the sizeof operator know the size of an array operand when you don\'t pass in the amount of elements in the array. I know it does

Answer 1

Quote from wiki:

It is the responsibility of the compiler's author to implement the sizeof operator in a way specific and correct for a given implementation of the language. The sizeof operator must take into account the implementation of the underlying memory allocation scheme to obtain the sizes of various datatypes. sizeof is usually a compile-time operator, which means that during compilation, sizeof and its operand get replaced by the result-value. This is evident in the assembly language code produced by a C or C++ compiler. For this reason, sizeof qualifies as an operator, even though its use sometimes looks like a function call.