Given the following code fragment:

/*
The C standard library header <float.h> provides macros that define the
range and accuracy of the float, double, and long double types.
Macros FLT_MAX, DBL_MAX, and LDBL_MAX provide the largest finite value that
can be represented by types float, double, and long double, respectively.
*/
#include <float.h>
double x = DBL_MAX;

write the exact value resulting from the evaluation of expression sizeof(x) when compiled using -bit GCC compiler.