Re: I have doubt

From:

Alexey <inline_four@yahoo.com>

Newsgroups:

comp.lang.java.programmer

Date:

Tue, 14 Aug 2007 12:53:37 -0700

Message-ID:

<1187121217.230269.218390@q75g2000hsh.googlegroups.com>

On Aug 14, 7:38 am, Manju <manjiri...@gmail.com> wrote:

hii

thanks for reply. I perfectly agree with u but when I think about
memory allocation of this expression I am not able to analyze it.
Could u explain that??

Best Regards

Manjiri (Manju)

On Aug 14, 2:34 pm, "LewyG" <lewynewsgr...@gazeta.pl> wrote:

"Manju" <manjiri...@gmail.com> wrote in message

news:1187082187.867372.205060@z24g2000prh.googlegroups.com...

int x=2;
int y;
y=x++*++x;

For this output is 8
I would like to know how this internally works

y = 2 [3] * [4] 4;

y = 2*4 = 8;

in [] is value after incrementation to show how this goes.

Sometimes the best thing to do is show rather than tell.

/cygdrive/d/dl# cat TestPP.java
public class TestPP
{
        public static void main(String[] args)
        {
                int x = 2;
                int y = x++ * ++x;
                System.out.println(y);
        }
}
/cygdrive/d/dl# javac TestPP.java
/cygdrive/d/dl# java -cp . TestPP
8
/cygdrive/d/dl# javap -c -classpath . TestPP
Compiled from "TestPP.java"
public class TestPP extends java.lang.Object{
public TestPP();
  Code:
   0: aload_0
   1: invokespecial #1; //Method java/lang/Object."<init>":()V
   4: return

public static void main(java.lang.String[]);
  Code:
   0: iconst_2
   1: istore_1
   2: iload_1
   3: iinc 1, 1
   6: iinc 1, 1
   9: iload_1
   10: imul
   11: istore_2
   12: getstatic #2; //Field java/lang/System.out:Ljava/io/
PrintStream;
   15: iload_2
   16: invokevirtual #3; //Method java/io/PrintStream.println:(I)V
   19: return

}