Switch

[Rahul Pawar]

Given the following code fragment
switch( x ) {
case 100 : System.out.println( "One hundred" );break;
case 200 : System.out.println( "Two hundred" );break;
case 300 : System.out.println( "Three hundred" );break;
}
choose all of the declarations of x that will not cause a compiler error. [Check all correct answers] (one or more may be correct)
A) byte x = 100 ;
B) short x = 200 ;
C) int x = 300 ;
D) long x = 400 ;
what will be the output
according to me it should be A B C
but it's B C
will anybody explain me y ?
thanks
rahul

[lee dalais]

hi Rahul
i tested the code, and byte x = 100; worked.
so it should be A,B,C.

[Ronnie Phelps]

The reason this doesn't work is because all the case constants should be able to fit in the range of the variable type. a bytes variable range is from -128(2^7) - 127(2^7-1). Therefore 300 cannot fit into a byte so "byte x" cannot be used.

[Rahul Pawar]

Thanks lee ,but still on exam cram site it is mentioned that ans is B C
i am posting u all the link of the site.
please go thru it
http://www.examcram.com/studyresource/qod/QODQuestion.asp?

[shabbir zakir]

hi Rahul!
Answers b and c are correct. The type used in the switch statement must accommodate all of the values in the case statements. For this reason, both b and c are acceptable. There are two considerations that the compiler checks; the variable in the switch statement must be capable of assuming all of the values in the case statements, and it must be convertible to an int. Answer a is incorrect; x cannot be a byte type because the case constants 200 and 300 are not compatible. Answer d is incorrect because switch statements cannot use long values. You would have to have a specific cast: switch((int)x) before the compiler would accept it.

[Ronnie Phelps]

200 is too large also.

[lee dalais]

hi Rahul
i originally tried the whole code sample, but now i did, and
Ronnie has the answer.

[lee dalais]

sorry, i meant i originally did not try the whole code but then i did and ronnie has the answer.
sorry again

[Rahul Pawar]

Hi Ronnie
u r correct
thanks

[Rahul Pawar]

Thank u all for ur immediate reply