About Question enthuware.ocajp.i.v7.2.991 :

[nickeasyuptech]

For this question -

What can be the return type of method getSwitch so that this program compiles and runs without any problems?

Code: Select all

public class TestClass{
   public static XXX getSwitch(int x){
      return x - 20/x + x*x;
   }
   public static void main(String args[]){
       switch( getSwitch(10) ){
          case 1 :
          case 2 :
          case 3 :
          default : break;
       }
   }
}

"The return type cannot be byte, short, or char because the expression x - 20/x + x*x; returns an int."

How do we know that it returns an int? (Thanks in advance for your help!)

[admin]

Explained here: viewtopic.php?f=2&t=1800&p=4831&hilit=never#p4831

[nickeasyuptech]

Thank you for the quick response!

[javabean68]

Hi,

the expression

Code: Select all

x - 20/x + x*x

can actually return a double, 20/x isn't always int...

Thank you for your help,
Bye
Fabio

[admin]

Not always, but in the code given in this question, 20/x will be an int.