wood burning stoves 2.0*
The moose likes Programmer Certification (SCJP/OCPJP) and the fly likes 0xbeef to integer Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login
JavaRanch » Java Forums » Certification » Programmer Certification (SCJP/OCPJP)
Bookmark "0xbeef to integer" Watch "0xbeef to integer" New topic
Author

0xbeef to integer

Netty poestel
Ranch Hand

Joined: Sep 20, 2004
Posts: 131
how does one see that "0xbeef" in

char c3 = 0xbeef;

has integer value of 48879 ?

Thx.
Chris Allen
Ranch Hand

Joined: Feb 01, 2003
Posts: 127
The hex value of 0xbeef can be converted to decimal as follows:

f -> 15 * (16 to power of 0) = 15 * 1 = 15
e -> 14 * (16 to power of 1) = 14 * 16 = 224
e -> 14 * (16 to power of 2) = 14 * 256 = 3584
b -> 11 * (16 to power of 3) = 11 * 4096 = 45056

Added together, you get 48879.
marc weber
Sheriff

Joined: Aug 31, 2004
Posts: 11343

Exactly.

You should recognize that a numeric literal that begins with 0 is octal (base 8), and one that begins with 0x is hexadecimal (base 16). In hexadecimal, the letters a, b, c, d, e, and f are used to represent base-10 values 10, 11, 12, 13, 14, and 15 respectively.

(Note: The "x" can be either upper or lowercase -- just like an "L" to denote long, an "s" to denote short, or an "e" to denote exponent.)


"We're kind of on the level of crossword puzzle writers... And no one ever goes to them and gives them an award." ~Joe Strummer
sscce.org
Netty poestel
Ranch Hand

Joined: Sep 20, 2004
Posts: 131
Thanks Chris , Marc.
final query on this topic, do these kind of 'otherwise calculator-calculations' [ powers of 16 multiplied and added with 2 digit numbers ] a regular feature in the exams ?

Thx. all
 
It is sorta covered in the JavaRanch Style Guide.
 
subject: 0xbeef to integer