Which of the following are legal? (Choose all that apply.)
A. int a = abcd; B. int b = ABCD; C. int c = 0xabcd; D. int d = 0XABCD; E. int e = 0abcd; F. int f = 0ABCD;
C, D.
The characters a-f and A-F may be combined with the digits 0-9 to create a hexadecimal literal, which must begin with 0x.