char array

[Anonymous]

Hi,
This is a question from one of the mock exams:
Q) After the declaration:
char[] c = new char[100];
what is the value of c[50]?
a) 50
b) 49
c) '\u0000'
d) '\u0020'
e) " "
f) cannot be determined
g) always null until a value is assigned
My answer was (e), since the char array would initialize all the elements to " ", when it is created. But the answer says (c). I tested with an example, and char array initializes all elements to " ". Can anyone clarify this please?
Thanks..

[Rolf Weasel]

Could u cut and paste the code u used to verify this? the following code printed "Element is \u0000":
public class Test {
public static void main(String[] args) {
char [] a = new char [100];
if (a[50]=='\u0000') System.out.println("Element equals \\u0000");
}
}
In fact the compiler won't let u put '' in the if condition.

[Anonymous]

I am displaying the value of the array element c[50] and it displays blanks (spaces).
public class test
{
public static void main( String args[] )
{
char[] c = new char[100];
System.out.println( "value of c[50]: " + c[50] );
}
}
Thanks..

[Rolf Weasel]

it is not enough to visually verify the value of the variable. in fact if u said
System.out.println("This is the questionable character : \u0000");
that'd look like a blank too. u have to use a condition to verify the content of the variable.

[Jim Yingst]

The problem is, "" is a String object, not a char. Any time you use double quotes, you are creating a String object. (In this case it's a String with 0 characters in it, but it's still a String.) All the other answers use single quotes, as appropriate for a char.

[Anonymous]

Thanks Rolf, Jim.

[This message has been edited by Java2learner (edited March 01, 2000).]

[Anonymous]

Hi,
One of the options given in the mock question is '\u0020'. I am curious to know what '\u0020' means? From the above discussion, I know blank spaces are represented in memory as '\u0000'. Also what form of values are these? Are they Hex or Octal values?
Can anyone clarify this please?
Thanks.

[Tony Alicea]

<CODE>0x20 ('\u0020')</CODE> is the blank character (space). And <CODE>0x0 ('\u0000')</CODE> is the NULL character. Most (if not all) systems display it as a blank.

[Rolf Weasel]

the numbers are hex.\u0020 is the character corresponding to ASCII 32, which, if i remember correctly, is the character '0'.

[Rolf Weasel]

tony's right, it is a space.