java question help!

[supergt]

Hi all,

I have been doing the youtube videos for cs106a to try and learn to use java. I am however struggling with this one question:

For the program below, trace through its execution by hand to show what output is
produced when it runs

/*
* File: Hogwarts.java
* -------------------
* This program is just testing your understanding of parameter passing.
*/
import acm.program.*;
public class Hogwarts extends ConsoleProgram {
public void run() {
bludger(2001);

}

private void bludger(int y) {
int x = y / 1000;
int z = (x + y);
x = quaffle(z, y);
println("bludger: x = " + x + ", y = " + y + ", z = " + z);

}

private int quaffle(int x, int y) {
int z = snitch(x + y, y);
y /= z;
println("quaffle: x = " + x + ", y = " + y + ", z = " + z);
return z;

}

private int snitch(int x, int y) {
y = x / (x % 10);
println("snitch: x = " + x + ", y = " + y);
return y;

}

}

I can pretty much follow most of the question apart from this part here:

int z = snitch(x + y, y);

More specifically the snitch(x+y, y); I know the x+y part but im not sure what the , y part means or how I find its value.

Is it that I have to do the snitch method, and where it says return y, I return that value to the function where it was called (which is the int z = snitch (x+y ,y) <-- this second y?


Hope I explained that well enough to help me out!

Thanks

 

[supergt]

Thanks for the response. Yes Ive followed exactly how you showed! However the problem is they give you the answer to the question:

snitch: x = 4004, y = 1001
quaffle: x = 2003, y = 1, z = 1001
bludger: x = 1001, y = 2001, z = 2003

And this is where I get lost. How they got the y = 1 for quaffle?

 

[supergt]

Okay I actually figured it out in the end... I was an idiot and shouldve just printed it out and used a pen to run through it rather then just reading and remembering...

Well this is at least a good problem to show how definitely not to code!!

Thanks for the help mate

 

[supergt]

y /= z; This part was very easy to catch me out... it is basically saying divide 2001/1001 and assign that to y. When I look at it I instantly think in my head "2" however it is 1.99 or something which of course would be 1 as it is type int!