Augustana CSC Q&A - Recent questions and answers in CSC211_Winter2018

Answered: When’s the last day we are allowed to post questions for a grade?

Mon, 09 Dec 2019 17:27:25 +0000

Probably safe to say before your final exam.

Good luck

Answered: A variable must be ________________________ precisely once, before it is assigned a value.

Mon, 09 Dec 2019 17:26:12 +0000

A variable must be initialized precisely once, before it is assigned a value.

Answered: The act of removing errors from your program is called __________________________.

Mon, 09 Dec 2019 17:25:40 +0000

the answer is debugging the program. Gotta get rid of those bugs!

Answered: Can someone explain what method overloading is?

Mon, 09 Dec 2019 17:23:52 +0000

It's if they have the methods have the same name but different signatures.

Different signatures meaning different parameters or the number of parameters being different.

Answered: Java Identifiers

Wed, 13 Feb 2019 18:16:02 +0000

While it is important to know what are illegal names for variable, methods, etc. It's also important to understand naming convention. You could name a method starting with a capital letter, for example, MethodName(), but it would not be following naming convention. The better name for this would be methodName().

We usually talked about naming convention whenever we introduced a new topic, so you could find more on naming convention throughout all the slides.

Answered: what is the import statement for using files?

Wed, 13 Feb 2019 18:08:03 +0000

You also use "import java.util." to use random numbers. There is also "import java.awt." that you would need to use graphics in your program.

Answered: Input/Output Files

Wed, 13 Feb 2019 16:15:39 +0000

It is not necessary to have both.

If you just want the output to go to the file, then use printf, print, or println with the PrintStream object that has been declared and connected to the file.

If you just want the output to go to the console window, then use System.out as the PrintStream so System.out.print...

In our lab, we sent the same output to both the console window and the file. In some of the test practice problems, that is not the case.

Answered: how to formulate a helper method for returning a count of characters in a string

Wed, 13 Feb 2019 16:10:22 +0000

I was trying to give someone else a chance to answer, but here goes.

To write the helper method, the method would have a parameter of type String. Then use a for loop to loop through each index of the String beginning with 0 up to but not including its length. For each index use the charAt method to get the character at that index comparing it to the character you are trying to count. Remember characters are single quotes so something like word.charAt(i) == 'm'. When true, increase a counter whose value is returned after the loop.

Answered: for the first question on the final review the output is wrong for the commission of sales price > 20000.

Wed, 13 Feb 2019 15:58:18 +0000

350 + (.01 *(price over 20000-20000))

Answered: for a question like (argument) || (argument) && (argument)

Wed, 13 Feb 2019 12:36:23 +0000

If there is a problem that is "x>5 || y<=8 && Z<5" then you look at the statements connecting with "&&" first because of the precedence over "||". The order of precedence is !, &&, and ||.

Answered: I don't know what's wrong in here? The code does not execute?

Wed, 13 Feb 2019 12:26:38 +0000

did you create an actual transaction.txt file like we had in the last lab? if not you have to do that becuase we don't know how many transactions we have

Answered: What does a compiler do?

Tue, 12 Feb 2019 23:33:34 +0000

It translates a programming language to binary language (simple computer language)

Answered: While importing a .txt file eclipse shows .txt.txt file?

Tue, 12 Feb 2019 19:32:16 +0000

did you name it something.txt because if so it might show up as something.txt.txt

Answered: Understanding Method Overloading

Tue, 12 Feb 2019 17:25:23 +0000

Do your mean why are those the only examples of method overloading from the Math class....or at least the Math class methods we've discussed?

Of those we've discussed, those methods have more than one "version" of the method with different signatures. A different signature means they have a different number of parameters or different types of parameters or both.

For example, Math.abs has one version that accepts an integer parameter and returns an integer and another version that accepts a double parameter and returns a double. The headers for the methods are public static int abs(int a) and public static double abs(double a). The abs method actually has two other versions for floats and longs too.

You can Google Java Math class to see all of the methods of the Math class. In that list, you can see many methods that have more than one "version". Each of those methods is overloaded.

Answered: If you want to give a name to a value that will never change while your program runs, you would create a what?

Tue, 12 Feb 2019 13:46:57 +0000

It's important to remember that class constants must be stated before the main method and that each part of the constant name is separated by a "_".

Answered: You declare a variable in the main method then try to use the variable in a diff static method. Why can't you do this?

Tue, 12 Feb 2019 00:11:10 +0000

This is due to the scope of the variable! (Check out page 99-100 for more on scope)
Scope restricts where a variable can and cannot be used. Methods are like containers holding objects (variables). Because of this the variable can only be used within its container (the scope, in this case the method) that it was declared in.

This can also cause issues when you declare a variable within a loop- the variable only exists within the loop, and therefore can not be used or called outside of said loop.

To use a variable across methods it’s important to create a class constant, as described on page 109.

public static final <type> <name> = <expression>;

For example, this is the format for adding a constant which could be called in multiple methods.

Answered: Procedural ______ is the act of splitting up a task into smaller subtasks that can be solved separately.

Mon, 11 Feb 2019 23:57:38 +0000

Procedural Decomposition

Answered: The scope of a ______ restricts where it can be accessed/used within the code.

Mon, 11 Feb 2019 23:53:58 +0000

Check out chapter 2, page 100 for more information on Scopes.

To sum it up, a scope limits/restricts access for a variable. Wherever the variable is declared, it can only be accessed within that scope. This is essential to understanding loops, so be sure to check it out!

Answered: Using the + operator on two strings is called what?

Mon, 11 Feb 2019 23:52:32 +0000

It is called concatenation.

Answered: When adding images, do I drag them into the Project file or the src file?

Mon, 11 Feb 2019 23:50:54 +0000

You can also create a separate folder in the project file to hold images, but you would have to be sure to call the whole path for the file within your code!

Answered: What will be the value of true || false and True && False?

Mon, 11 Feb 2019 23:45:21 +0000

Your question is a little confusing. Are these two separate questions?

In general, the || sign represents OR. To explain more clearly, it’s saying that the value is True IF either side of the || is true. So, when True || False, the total value would be true.

The && sign represents AND. In this scenario both sides MUST be true in order for the entire value to be true. Therefore True && False is FALSE because one side is false.

Section 5.3 of the textbook might be of help as well!

Answered: What are the 3 logical operators and the precedence of those?

Mon, 11 Feb 2019 23:39:40 +0000

|| = or
&& = and
! = not

Answered: How do we create a new color?

Mon, 11 Feb 2019 23:38:42 +0000

Try using this link to pick colors- you can use the mouse to find the color you would like and then it gives you the RGB code for that color.

https://www.google.com/search?q=color picker

Answered: "Inside string literals, the \ character serves a special purpose as the ____ character."

Mon, 11 Feb 2019 23:36:14 +0000

The backslash character (\) serves as the beginning of an escape sequence. An escape sequence uses a two character sequence of letters (such as \t) to distinguish a specific character that is difficult to type when pruning text. The \t example represents the tab character. There’s more information on page 16 of the textbook.

Test location

Mon, 11 Feb 2019 21:11:30 +0000

For Dr.Stonedahl's exam, is it hosted in our usual classroom of 209 ?

What does "" do?

Mon, 11 Feb 2019 17:20:03 +0000

Lets say we declared
String word = "";

What does the "" mean?

Are the codes supposed to be different in mac and windows?

Mon, 11 Feb 2019 16:33:39 +0000

A program worked fine in a windows computer but did not work in Mac.

For casting, does it matter which variable gets casted?

Mon, 11 Feb 2019 14:44:08 +0000

For example:

is average = (double) value / count the same as average = value / (double) count?

How soon will the exam grades be posted?

Mon, 11 Feb 2019 07:17:33 +0000

Mueller final start time

Mon, 11 Feb 2019 07:15:57 +0000

What time does Mueller's final start for the 211-02 section?

Programs on exam for Mueller’s class

Mon, 11 Feb 2019 07:05:12 +0000

How many programs will there be on the exam?

What do I use in order to add pictures onto a drawing panel?

Mon, 11 Feb 2019 03:14:46 +0000

How many questions will be on the final for Stonedahl's class?

Sun, 10 Feb 2019 23:05:19 +0000

How do I prompt the user for an int value?

Sun, 10 Feb 2019 20:44:39 +0000

What is the import statement for getting the Scanner?

Sun, 10 Feb 2019 20:39:05 +0000

In "panel.sleep(100)", what is the unit of 100?

Sun, 10 Feb 2019 20:31:19 +0000

How do I get the graphics pen?

Sun, 10 Feb 2019 20:29:01 +0000

How do I round up a double to 2 decimal places in a printf statement?

Sun, 10 Feb 2019 20:23:44 +0000

What are the largest possible int value?

Sun, 10 Feb 2019 20:20:00 +0000

Does the index of a certain String start from 0 or 1?

Sun, 10 Feb 2019 20:18:06 +0000

What is meant by method overloading?

Sun, 10 Feb 2019 20:16:13 +0000

What is the syntax for single and multi line comments?

Sun, 10 Feb 2019 20:06:46 +0000

Can anyone tell me what primitive types are and how many are there?

Sun, 10 Feb 2019 18:17:21 +0000

how can we create new color?

Sun, 10 Feb 2019 18:13:02 +0000

does the .setWidth(); method changes the size of the panel after execution or will it draw a new panel?

Sun, 10 Feb 2019 17:22:28 +0000

Is there any extra credit chance in final exam?

Sun, 10 Feb 2019 16:42:25 +0000

Code Redundancy

Sun, 10 Feb 2019 15:05:38 +0000

On the coding part of the final, are we losing points if our codes are redundant?.

How do you import a Midi file to a program on Eclipse?

Sun, 10 Feb 2019 00:26:09 +0000

Are we Gonna have a difficult or complicated coding part for the finals?

Sun, 10 Feb 2019 00:20:16 +0000

BJP3 Self-Check 5.8: doWhileLoops

Sun, 10 Feb 2019 00:17:23 +0000

What are the answers to B and C?