I'm reviewing for my mid term which I will be taking this evening. On the practice exam, the following question is given:
Given the following, which line is illegal, assuming that class Watch extends class Clock?
Clock A = new Clock();
Watch B = new Watch();
A=B;
B=A;
On the answer key, he states that B=A; is the illegal statement because a Clock is not necessarily a Watch...but that feels wrong....
first2drown
Last Activity: Apr 21 '09, 10:01 PM
Joined: Jan 27 '09
Location: Columbia, SC
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Well in reverse2() you do want to keep the 0s, but we used the Math.pow() method to do it, I was just testing reverse3() as a replacement to reverse2(). =D There were supposed to be 2 methods in my program, one that takes out the 0s and reverses, and one that reverses and keeps the 0s. -
Thank all of you so much for the help. In my last post about reverse3() i meant to edit it to be recursive.
I tested it and this code does work. I went ahead and submitted the final version to the teacher along...Code:public static int reverse3(int a, int rev) { if (a < 10) return 10*rev+a; return reverse3(a/10, 10*rev+a%10); } }Leave a comment:
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Also, let me know if you see something wrong with this? Instead of the original reverse2 method.
Code:public static int reverse3(int a, int rev) { if (a < 10) return 10*rev+a; return reverse1(a/10, 10*rev+a%10); } }Leave a comment:
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Okay wow. I actually get it now. I added your code to my program, modified it so it could compile, then ran it in debug mode so I could see exactly how it worked. The problem I was having understanding it was the 2nd int parameter in the method. I feel like I tried everything except that. Also, it helped me learn how to use those ?:; statements, for some reason we didn't go over those in class. My final code:
...Code:Leave a comment:
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Yeah still couldn't figure it out.Leave a comment:
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And after reading your post again I got an idea, so I'm gonna try that right now.Leave a comment:
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Jos, I would show you what I wrote if I had saved any changes to the code that I made Thursday night in Lab. I'm VERY new to this programming thing. I love it, but some concepts are still hard for me to grasp. Let me show you the actual assignment: http://www.midlandstech.edu/edu/ed/i...n/283/hw3.html
He extended the deadline, so I can work on it on Tuesday and Thursday during lab. The thing is...even my teacher can't...Leave a comment:
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Thanks BSCode, I was still having problems getting reverse1() to work, and I think you just helped a lot.Leave a comment:
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Thanks again Jos! When I get back from work I will try to do that. It seems simple enough :).Leave a comment:
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Figured it out
Okay so I'm feeling really good about myself right now. I got the program to work fairly well. HOWEVER...dot dot dot...the reverse1() method is supposed to eliminate any zero's. For example, 1024 should become 421. But I cant think of a way to do this. Anyone have any ideas? I have until next Tuesday to figure it out.
...Code:import java.util.*; import java.lang.*; public class
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Thanks Joe! It will take a while for me to fully comprehend what you just wrote, but I'm going to print it out and refer to it whilst I write the method. I have a good deal of freedom as far as writing the method goes so I dont see why I couldn't use two. As long as I'm not converting it to a string ha! Thanks again Joe. If anyone else has any more suggestions please post!Leave a comment:
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Recursion...Its hard to grasp. Help.
So I have my Algorithms class tonight and I want to get the lab done before or during the class. I have write a recursive method that takes an int as a parameter and also returns an int. It has to REVERSE the int. What the heck. I'm not allowed to convert it to a string or anything, it says that I will not get credit if I do. So could someone give me some hints? The only thing I've gotten so far is the main method that accepts an int from the...
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