Can u guys help me with that?

Question

i can't understand this code can someone explain it for me
int y=60;
int x=28;
swich(y%4){
case 0 :
case 1:y=y-10 ;
break;
case 2:
case 3:y =y-5;
break;
}while(y>x)
System.out.println(y);

Answer 1

thanks Matthias one question. :what will be happen if the code have hade break ?

Answer 2

Matthias thank you 🤗

Answer 3

hey Jang Jaeung thanks for your explanation... ^-^

Answer 4

y%4 gives you the remainder when you divide y/4
If the remainder is 0 or 1, you substract 10.
If the remainder is 2 or 3, you substract 5.
This is done until y is not any more larger than x.

Note that cases without a break statement fall through the next one, until a break appears or reaches the end of the switch block.

The final y is displayed.

Answer 5

You mean a break in case 0 and 2? Then it would stuck in an endless loop as no operation on y is performed.

You can also try it in the code playground :)

Answer 6

I see that since the remainder for 60 / 4 is 0, it is the case for 0.
then there is no break, so it keeps going on to the next case, where it is 1.
now there, y is changed ti 50, and 10 is subtracted from it.
there is break now, so the switch case ends.

now there is while loop. as y is 50, and x is 28, it is true always. so the program keeps printing y over and over.

//I knew that inside of if statement can be run without bracket if that is a single line, but did not know it is the same for while loop until I tested just now. thanks for letting me to figure this out :D

// I was confused why the answered were so disorganized, and that was because it was sorted by vote. I have question about why you saying it stuck in an endless loop. No matter there are breaks after case 0 and case 2, current code is in endless loop. what changes is the value of y that is printed. Isn't it?? if there is break for case 0 and 2, then 10 is not subtracted, and prints 60. if no break, then 50.