Constant expressions are evaluated at compile

String constants can be concatenated at compile time

Size of array should be known at compile time

All of these

Two

Eight

Twenty

Theoretically no limit. The only practical limits are memory size and compilers

&x[i-1] + sizeof (int)

x + sizeof (int) * i

x+i

none of these

″12345″

nothing since 12345 is an integer

S is an illegal name for string

%s cannot be used for reading in values of S

Initialization is a part of definition

It is a declaration

It is a formal parameter

All of these