File APIs for Java Developers
Manipulate DOC, XLS, PPT, PDF and many others from your application.
http://aspose.com/file-tools
The moose likes Programmer Certification (SCJP/OCPJP) and the fly likes char literals Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login


Win a copy of Soft Skills this week in the Jobs Discussion forum!
JavaRanch » Java Forums » Certification » Programmer Certification (SCJP/OCPJP)
Bookmark "char literals" Watch "char literals" New topic
Author

char literals

Rajani Sudhakar
Ranch Hand

Joined: Apr 28, 2004
Posts: 60
class MCZ24 {
public static void main (String[] args) {
char a = 061; // 1
char b = '\61'; // 2
char c = '\061'; // 3
char d = 0x0031; // 4
char e = '\u0031'; // 5
System.out.print(""+a+b+c+d+e);
}}

A compile-time error is generated at which line?

a. 1
b. 2
c. 3
d. 4
e. 5
f. None of the above


Answer: f (None of the above)
Reason given :
All of the declarations are legal. The first three ( 061, '\61', '\061' ) are declared in octal format. The fourth (0x0031) is declared as a hexadecimal literal. The fifth ('\u0031') is a Unicode escape sequence.

061 is a valid char literal.Its in octal format.
But is '\061' and '\61' in octal format?
Can anyone justify how '\61','\061' are valid char literals.

What are the various Unicode escape sequences ?

Thanks in advance,

regards,
rajani.
Rajani Sudhakar
Ranch Hand

Joined: Apr 28, 2004
Posts: 60
What are the various unicode characters,escape sequences or backspace characters etc.... which are required to know for the Programmer's exam?

Thanks in advance,

regards,
rajani.
Anuradha Shanmugam
Greenhorn

Joined: May 09, 2004
Posts: 8
Rajani,

According to JLS one of the Escape sequence type are using octal literals.

There are three formats of Octal Escape sequences.

1) \octaldigit
2) \octaldigit octaldigit
3) \zerotothree octaldigit octaldigit

For more information on EscapeSequence refer JLS @ http://java.sun.com/docs/books/jls/second_edition/html/lexical.doc.html#101089

By the way I dont know how much we need to cover for SCJP 1.4

Regards


Anuradha<br />(SCJP 1.4)
Canon Chiu
Greenhorn

Joined: May 05, 2004
Posts: 1
Yes. Both \61 \061 are in octal and they are within the range of 0 to 2**(16-1). So, they should be valid.

Originally posted by rajani sudhakar:
class MCZ24 {
public static void main (String[] args) {
char a = 061; // 1
char b = '\61'; // 2
char c = '\061'; // 3
char d = 0x0031; // 4
char e = '\u0031'; // 5
System.out.print(""+a+b+c+d+e);
}}

A compile-time error is generated at which line?

a. 1
b. 2
c. 3
d. 4
e. 5
f. None of the above


Answer: f (None of the above)
Reason given :
All of the declarations are legal. The first three ( 061, '\61', '\061' ) are declared in octal format. The fourth (0x0031) is declared as a hexadecimal literal. The fifth ('\u0031') is a Unicode escape sequence.

061 is a valid char literal.Its in octal format.
But is '\061' and '\61' in octal format?
Can anyone justify how '\61','\061' are valid char literals.

What are the various Unicode escape sequences ?

Thanks in advance,

regards,
rajani.
Rajani Sudhakar
Ranch Hand

Joined: Apr 28, 2004
Posts: 60
Thankyou Anuradha... for sending me the link..

regards,
rajani.
 
I agree. Here's the link: http://aspose.com/file-tools
 
subject: char literals