degamer106

Hmm I was lookin through a recursion program in this book i have here and the only thing I'm having trouble with is the modulus operator. I know that it returns the remainder of 2 numbers. But, suppose I have this: x % y If x > y then the …

Let me explain what I'm supposed to do first. My assignment is to take text from a dictionary entry and display it in my client area. This dictionary entry contains characters like \ " ' and text that's written in Greek. There is an image in the upper left hand …

Hi, In on of the lecture notes that was given to me by my prof, I was told that setting the ResizeRedraw value to true would allow whatever I drew on the form to be, well, resized. However, it does not seem to work. Here is my code: [CODE]using System; …

When I add buttons to a panel, the buttons seem to take a huge amount of space. How do I get rid of the space? For example: [CODE] import java.awt.*; import java.awt.event.*; import javax.swing.*; public class Tester { public static void main(String[] args) { JButton dayButton = new JButton("Day"); JButton …

Ok, I looked in the API and was able to create the scroll bars. Problem is, I can't make them scroll, even though the parameters I passed in explicitly said to have the bars around. What I'm trying to do is to create a scrollpane around a JComponent object that …

Suppose I have a week that begins with Sunday and ends with Saturday (so UMTWThFS). How do I get the date for each day of the week if, lets say, we use this month and year? I looked in the API but I wasn't sure what to extract to make …

I'm having a little trouble trying to nest two component classes (both extend JComponent) together. When I create the frame in my tester file, instantiate each class, and try to add both of them to the frame, it doesn't come out correctly. For instance, I want my frame to display …

1) How do I tell if I have java 5 or java 6 installed? 2) I have my program commented using javadoc syntax. However, when I run javadoc from the command prompt and then open the html files, I do not see any documentation. What am I doing wrong? For …

I'm almost finished with this program but the problem I'm having is with freeing the memory I allocated. Particularly in the area where I have pointers to strings. [CODE]#include <stdio.h> #include <string.h> #include <stdlib.h> /////////////// user defined data ///////////////////// struct State { char * name; // state name int year; …

The problem is that I have an ArrayList which stores objects that contain a Shape (actually a Composite shape like a Car) and (x,y) coordinates. Suppose I'm supposed to retrieve each object and the coordinates for drawing. My question is, how do I draw an Shape on the screen at …

I'm trying to put all the buttons (and their icons) into a single class. However, when I try to draw just one button in a frame, it doesn't show up. I can get it to be displayed if I instantiate the button in the same class as the Frame, but …

I'm stuck trying to figure out how to update the text field after I click on the button in the GUI. The number of roaches is supposed to be updated each time I click, but I can't seem to find the right tool for the job in the APIs. RoachPopulation.java …

This is a relatively simple program but for some reason, I can't compile it. I'm pretty sure the code is correct and working. My compiler keeps saying that it cannot find a constructor matching a HourlyWorker constructor when I instantiate a HourlyWorker object. I've checked and rechecked the code (in …

I did a quick search on the forums and there was another problem similar to the one i'm trying to solve. I'm supposed to use the first word of a sentence as a search parameter and check the rest of the string for occurences of the word. If the word …

So we're supposed to modify this class, which implements Comparable, so that it accepts any type of object. The Comparable interface contains the method signature for compareTo, which I need to implement. What I'm uncertain of is how to implement this method. I know that compareTo is supposed to return …

So here's the problem [QUOTE]Write a program that asks the user to input a set of floating-point values. When the user enters a value that is not a number, give the user a second chance to enter the value. After two chances, quit reading input. Add all correctly specified values …

I'm supposed to design a method that takes in a double value and translates the value into the closest letter grade. 4,3,2,1,0 denote A, B,C,D,F, respectively. + increases a grade's numerical value by 0.3 and - decreases a grade's numerical value by 0.3. There is no F+ or F-. A+ …

Ok, so my goal is to draw a rectangular spiral in java. So far, I've created the Spiral Viewer class and the SpiralComponent but I'm not quite sure how I would implement the SpiralGenerator class. Here's what I have: SpiralViewer: [CODE]import javax.swing.JFrame; /** Test driver for Spiral class. */ public …

I'm trying to get this ISBN checker to work. I've used the formula from this [URL="http://mathworld.wolfram.com/ISBN.html"]site[/URL] and also this [URL="http://en.wikipedia.org/wiki/International_Standard_Book_Number"]site[/URL] and it seems to work fine [B]except[/B] for the ISBN of my Java book. When I compute my book's ISBN (0131496980), it is apparently invalid. I have tried the other …

I was a little confused by the brief explanation that my Assembly teacher gave on pipelining. I don't think I really understand the process that well... 1) In a 4-stage non-pipelined processor, how many clock cycles does it take to execute 3 instructions? Assume each stage takes 1 clock cycle. …

One of the things that's been confusing me so far is why we have to override the paintcomponent() function after extending it. For example, this program draws an ellipse: [CODE]import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.geom.Ellipse2D; import javax.swing.JComponent; public class DrawEllipseComponent extends JComponent { public void paintComponent(Graphics g) { …

Hi, I need help with drawing an ellipse that is bounded by the window it is drawn in. I have to use the Ellipse2D API. Maybe I'm overlooking something but I can't seem to get the circle to fit the window. This is what i have so far: [CODE]import java.awt.Color; …

If I do a public inheritance and the member data in the base class I'm deriving from is protected, is the only way to access the data in the base class via member/friend functions of the derived class?

Hi, I can't get the following code to work. I have my converting constructor (second line) to change an int type to a car type but my compiler says there's something wrong with the overloaded + operator. It says here in my book that if I want to do an …

How do i dereference a pointer to something in a class without having to write another function to dereference it for me? For instance in this code: [CODE]class Fraction { public: Fraction(int left = 0, int right = 1); Fraction(Fraction & obj); ~Fraction() { delete fl; } double getFraction() { …

The problem I'm having is with overloading the >> operator so that I could read data from a file directly into a class's member data. Everytime I run through the program, it just crashes. when I look through the debugger, it brings me to some page of crazy code. So …

I'm having a bit of a problem with function style cast with classes. When I exit the function I expect an instance of Database to be returned. This instance would then be copied into the db declared in main. I've writtien a copy constructor and it works fine (tested by …

This might seem like a silly question, but how do I read in a newline char, by itself, as input? For example, if I gave the user a choice to enter a string for a new filename, or let them just press ENTER for some other choice. forgot to add …

If I have a dynimcally allocated array of objects and each of these objects contains a pointer to a string, when I use the 'delete' function to return memory, do I have to go through each array element and free each string individually or does the 'delete' take care of …

So in my class we just finished covering the topic of constructors and destructors. Now, my teacher has given us a lab where we have to create these classes and each of them must have a ctor/dtor. The problem I'm running into is..well.. it would be easier to describe in …

>_< I've been searching for nearly an hour and trying to find this memory leak. If you guys could help me find it it would be great. Thx. [CODE]#include <iostream> #include <cstring> #include <crtdbg.h> using std::cout; using std::cin; using std::ios_base; /////////////// user defined data ///////////////////// /////////////// function prototypes //////////////////// class …

i've been trying to use fscanf to parse parts of a line from a file. The format of each line is like the following: Connecticut,1788,Hartford,29 I've been trying to use this: [CODE]fscanf( fpIn, "%[^,], %d% [^,], %d", name, &year, cap, &popRank )[/CODE] To extract the state, year, capital, and population …

I've been asked to create a movie data baseusing a hash table (w/ linked-list collision resolution) and a BST. Both of them contain a field that points a given structure (we'll call it *pMovie and its of type MOVIE) in memory. For example, if i'm going to insert "The Matrix" …

I'm having trouble parsing a line with sscanf. My line is: 1941 How Green Was My Valley; John Ford and I want to separate it into a number, string, and another string. I tried: [CODE] if ( sscanf( buffer, "%d %41[^;] %51s", &pMovie->year, &pMovie->title, &pMovie->director ) == 3 )[/CODE] But …

I have the following declarations: [CODE]typedef struct{ int year; // key char title[51]; char director[41]; } MOVIE; typedef struct node{ struct node *left; MOVIE *movie; struct node *right; } TREE_NODE;[/CODE] lets say I create a TREE_NODE called root. Why can't I do this declaration? [CODE]root->movie->year = 1990[/CODE] Whenever I try …

[CODE]#include <stdio.h> struct FUN { char x; char *y; int z[20]; }; int main(void) { struct FUN fn1; struct FUN fn2; struct FUN fn3[10]; struct FUN fn4[50]; return 0; }[/CODE] is an assignment like fn4[23] = fn3[5] invalid?

One of the things I can't get working is reading and writing a structure to and from a file in binary. I'm sure that I'm using fread and fwrite correctly. However, I keep getting crashes which I cannot find ways to debug. [CODE]#include <stdio.h> #define MAX 1 typedef struct { …

Hi. I can't a small part of this program to work correctly; the square root function either returns a bunch of funny symbols OR it returns 0.00 On a side note, I have 2 questions: 1) If you have a structure nesting two other data structure types (like in my …

On a recent exam I took, the following question was given: int ***p; give the type for the each of the following: a. p b. *p c. **p d. ***p For part a, should I be given any credit for saying an "address of an address of an address?" After …

This program is supposed to make two passes through a file; the first pass counts the number of elements inside the file to get the total size; the second pass will fill the array and sort it. The problem i'm having is that on the second pass, the array is …

I'm supposed to take user input in the form of a prefix expression, convert it to infix and postfix, and then print the results. So far, I've got both working, but I would like to add some parenthesis to the infix expression once its converted. At the moment, I can't …

OK.......right now i'm learning about binary tree traversal and this problem looks like a total killer to me. Here's it is: Write a program that takes as input the preorder and inorder traversals of a binary tree, and produces as output the level-order traversal of the tree. All i gotta …

Currently, I've been reading about Dynamic Programming in this book and I don't really see the difference between bottom-up dynamic programming and top-down dynamic programming. It seems like both of these techniques do the same thing - compute, save, and finally check to avoid needless recomputation. Any tips??

This problem is asking me to convert an infix expression to a postfix expression using recursion. I did the exact same problem using stacks (w/o recursion), which was much easier, but on this one, I get stumped constantly when I try to come up with a line of code to …

From what I read in a few books, a static variable retains its value(s) throughout the lifetime of a program. In this stack program I've been trying to fix up, the static var doesn't seem to change or hold its contents after different function calls. I can't figure out what's …

I'm kind of confused about how the modulus operator works. Suppose i have x % y with x > y. So if x was 6 and y was 2, then 6 % 2 would produce 0. But i don't really get what happens when x < y :eek: In this …

I wrote a program up with linked lists that creates a circular list containing 9 nodes. Each node contains a number (ranging from 1-9) as an item. My question is...in the while loops, how does [CODE]x = x->next[/CODE] cause the pointer to move across the list? [CODE]#include <stdio.h> #include <stdlib.h> …

How do I make selection sort work with strings in a structure?? My compiler doesn't seem to like my variable assignments under the show_alpha() function. :cry: [CODE]#include <stdio.h> #include <stdlib.h> #include <string.h> #define SMAX 12 #define LEN 20 #define EMPTY 0 void show_empty_num(struct data *); void show_empty_list(struct data *); void …

How do you clean out the contents of an array after you take input? In my program, I put fgets in a loop to get input. However, once I loop back to the beginning to get input for the second time, the previous input values are still in the array, …

The goal of my program is to take in 2 inputs - one for the base, and one for the number (which should be of that base type). It will then do a calculation and print out the number in base 10 form. For instance, Input Output ========== ====== 10 …