----------------------------------- Qamar Tue Mar 25, 2008 8:32 am Making a quiz ----------------------------------- Hi, i'm taking a gr. 11 computer information science course and i need help plz. =) Our teacher has told us to make a multiple choice quiz that has 30 questions and it randomly selects 25 of those questions then tells us what % of a mark we got... and he's barely taught us anything.. can anyone help me here .. or where to even start ? thanks ----------------------------------- Tony Tue Mar 25, 2008 9:45 am RE:Making a quiz ----------------------------------- you start with making a "quiz" made up of one question, then place that into a 25 step loop. If you do it right, there is _very little_ code that you need to write. ----------------------------------- Qamar Mon Mar 31, 2008 7:30 pm Re: Making a quiz ----------------------------------- okay... i see how you saying to do this... but i don't have a clue on how to.. haha. like i said. our teacher hasn't taught us much and is expecting us to know stuff this is my code so far... he said its okay to have them in the terminal window. but he'd give us more marks if we could get them in a dialog box or make an applet with radio buttons import java.io.*; public class Quiz { public static void main(String ----------------------------------- CooKieLord Fri Apr 04, 2008 8:24 pm Re: Making a quiz ----------------------------------- 1. It would be awesome if you posted your code in [code] [/code] tags. 2. I would super-impose two arrays. One would be your bank of questions, and the other would be your answer key. ----------------------------------- Euphoracle Sat Apr 05, 2008 8:26 am RE:Making a quiz ----------------------------------- Doing it the way you are doing it will leave you with 1000+ lines that someone else (this is was Tony was getting at) can do in about ~30 give or take line breaks. If your teacher thinks this is the best way of doing it, then you're going to have a serious problem next year. If you haven't consulted your teacher, do so. Don't be afraid to show your teacher your abilities and ask them for suggestions on how to improve. If you teacher has any capabilities in this subject, he/she should be able to help you change your code from what it is now (repetitive and unnecessary) to efficient and dare I say it, short. ----------------------------------- Barbarrosa Sat Apr 05, 2008 4:32 pm Re: Making a quiz ----------------------------------- Here are some recommendations, if you have to do this the hard way (you'll end up with < 300 lines, < 100 if you're fairly good, < 50 if you do the easy way well) Assumptions to fill (for the hard way): 1. Is a specific number of possible answers given to all questions? 2. Terminal or GUI App? 3. Quiz loaded from file or embedded in program? A. If from file, how to expect input? Make a file organized as such. B. If embedded, how to create it C. If embedded, whether you need to make a serious quiz, one with varying questions, or just show that you can use java to make one. 4. Is the user always assumed to give valid input? (protecting from bad input could save you a lot of trouble) 5. If GUI, is there a next button, or is it automatically changed when an option is selected? 6. How should the final output be organized (GUI or terminal)? A. Grade: 100%, 98.6%, 14.54% ? B. List Answers to Questions? C. Other Information? Recommended classes to use: Reading in from file: BufferedReader/InputStreamReader Reading from terminal input: Scanner Formatting Numbers: java.text.NumberFormat GUI: Anything in java.awt.* or javax.swing.* (latter contains lightweight components) ----------------------------------- Qamar Tue Apr 08, 2008 8:10 am Re: Making a quiz ----------------------------------- hey... so i won't lie.. i don't know what half of those mean... all i know is that i'm going to do it in a terminal window, teacher said he'd give us more marks to get it done in a dialog box but this project is already like 2 weeks past due. could someone help me here ? how do i create a random generator that would make numbers between 0 - 30 and only pick 25 ? import java.io.*; import java.util.Random; public class MCE { public static void main(String[] args) throws IOException { InputStreamReader reader = new InputStreamReader(System.in); BufferedReader buffer = new BufferedReader(reader); String[] Qs = {"An object...","Objects preform actions by executing...", "An Object..."}; String[] As = {"A) Represents useful data.","A) Methods.", "A) Represents useful data" }; String[] Bs = {"B) Preforms actions.","B) Actions", "B) Perfroms Actions"}; String[] Cs = {"C) Both A and B.","C) Procedures", "C) Both A and B"}; String[] Ds = {"D) None of the above.","D) Events", "D) None of the above"}; String seeker; int cntr = 0; float mark = 0; int Qcount = 0; float percent = 0; while (cntr < 3){ System.out.println (Qs[r]); // r is the variable that will produce a random number thingy.? System.out.println (As[r]); System.out.println (Bs[r]); System.out.println (Cs[r]); System.out.println (Ds[r]); seeker = buffer.readLine(); Qcount = Qcount + 1; cntr = cntr+1; /*if(seeker.equalsIgnoreCase("c")) { mark = mark + 1; } */ percent = mark / Qcount; percent = percent * 100; percent = Math.round (percent); System.out.println("Your score is: " + mark + " out of " + Qcount + " which is " + percent + "%"); } } } ----------------------------------- Barbarrosa Wed Apr 09, 2008 3:04 am Re: Making a quiz ----------------------------------- import java.util.Random; ... Random rand = new Random(); int[] randInts = new int[25]; for(int i = 0; i < 25; i++) randInts[i] = rand.nextInt(30) + 1; ----------------------------------- Nick Wed Apr 09, 2008 3:23 am RE:Making a quiz ----------------------------------- Barbosa, two errors. 1: 30 + 1 = 31 > max questions 2: say it picks 3 twice, that's not very professional ----------------------------------- Barbarrosa Wed Apr 09, 2008 3:38 am Re: Making a quiz ----------------------------------- Sorry, woops. Wrong assumptions. This will give you 25 numbers, each between 1 and 30, none equivalent to the next, in an int array. import java.util.Random; ... //begin method Random rand = new Random(); int[] randInts = new int[25]; int recI = 0; for(int i = 0; i < 25; i++){ recI = rand.nextInt(30) + 1; //You'll probably want it to remove the +1 if you're using an array to store questions, because an array starts at zero if (arrayContains(randInts, recI)){ i--; continue; } randInts[i] = recI; } return randInts; //end method private boolean arrayContains(int[] a, int i){ for(int o = 0; o < a.length; o++) if(i == a[o]) return true; return false; } Barbosa, two errors. 1: 30 + 1 = 31 > max questions 2: say it picks 3 twice, that's not very professional 1. Random's nextInt(int) method returns an integer between 0 & int-1 2. Fixed here. I wish the arrays in java had a contains(int) method. ----------------------------------- Qamar Wed Apr 09, 2008 8:37 am Re: Making a quiz ----------------------------------- okay that is sick... but could you tell me how to implement that into my code ?. haha i've spent my whole comp. sci class (75mins) trying to get it to work... but with no success ----------------------------------- Barbarrosa Thu Apr 10, 2008 4:07 pm Re: Making a quiz ----------------------------------- 1. Give more significant names to your variables, even if they are longer These don't make much sense: String seeker; int cntr = 0; int Qcount = 0; What's seeker doing in a quiz program? What's cntr? Why is Qcount capitalized, and why isn't numQuestions or questionCount used? 2. Use for statements like: for(T i:T[]){} // T represents the type - int, float, String, etc. Replace T[] with an array of that type. for(int i = 0; i < array.length;i++){} 3.Use methods to divide up complex tasks: private boolean intArrayContains(int[] a, int i){ for(int o = 0; o < a.length; o++) if(i == a[o]) return true; return false; } 4. Explore the javadocs online - java has classes and interfaces for lots of things. java.util.Scanner java.text.NumberFormat ----------------------------------- Qamar Tue Apr 15, 2008 8:59 pm Re: Making a quiz ----------------------------------- okay cool... so i've explored some different stuff and i decided to put everything into an array... my only problem is i don't know how to set parametors on the random integer and also so that it won't repeat the same quesitons... my code so far is /** * A quiz that asks you 25 questions randomly out of 30 * By: Qamar, Matt and Steven */ import javax.swing.*;// imports the superclass that allows for use of GUI import java.util.Random; //import java.io.*; public class Quizrr { // public static void main(String[] args) {// String[] Qs = {"An object...","Objects preform actions by executing...", "Which line of code is correct?","What does OPP stand for ?"}; String[] As = {"1) Represents useful data.","1) Methods.", "1)System.out.PRINT ","1) Official Programming Protocol" }; String[] Bs = {"2) Preforms actions.","2) Actions", "2) SYSTEM.out.Print","2) Object Oriented Programming"}; String[] Cs = {"3) Both A and B.","3) Procedures", "3) system.Out.Print","3) Ontario Programming Police"}; String[] Ds = {"4) None of the above.","4) Events", "4) System.out.print","4) Objective Protocol Packets"}; int [] answer = {3,2,4,2}; int count = 0; String ans; float mark = 0; float percent = 0; int ans2 ; while (count < 4) { Random r = new Random(); int randint = r.nextInt(4); // this will pick 1 less than what is in the brackets (n - 1) ans = JOptionPane.showInputDialog("" + Qs[randint] + "\n" +"" + As[randint] + "\n" +"" + Bs[randint] + "\n" +"" + Cs[randint] + "\n" +"" + Ds[randint] + "\n" ); ans2 = Integer.parseInt(ans); if (ans2 == answer[randint]) { mark = mark+ 1; } count = count + 1; } // end loop percent = mark / count; percent = percent * 100; percent = Math.round (percent); JOptionPane.showMessageDialog(null,"Your score is: " + mark + " out of " + count + " which is " + percent + "%");// diplays a pop-up that has the final information } // end method } // end class and yeah. everything is okay except for the random integer selection... i saw the code from before... but i don't understand the rest of it ----------------------------------- wtd Wed Apr 16, 2008 12:44 am RE:Making a quiz ----------------------------------- Try to use an array of objects rather than parallel arrays. ----------------------------------- Qamar Wed Apr 16, 2008 3:59 pm Re: Making a quiz ----------------------------------- okay. never mind. my teacher said that it would be a better idea if i could just shuffle the arrays at the beginning of the program so that they don't go in order each time... how would i do that ? and keep the Questions and answers and possible answers the same ? ----------------------------------- Barbarrosa Thu Apr 17, 2008 12:39 am Re: Making a quiz ----------------------------------- What wtd is probably talking about is making a class for each question, with the corresponding answers given you would create a class, each with the required number of answers, a correct answer (maybe a String or char), and constructor(String ques, String a, String b...), toString() & returnCorrect(String) methods. Then create a method that chooses random questions, much like the one I put together above.This is probably an answer to your problem of randomly ordering them. After you have put together a question class, store the questions in it by instantiating all of them at the beginning of the main method (or in another method that is called at the beginning of the main method) and then randomizing them. Btw, if you're making a gui, you may want to simplify by separating the gui components from the non-gui components. To preserve a more true object-orientation, you could create a constructor for the quiz class and give the frame a pre-made gui with Quiz(frame). Additionally, you will probably need to give your gui a specific layout, add ActionListeners to the choices (& next button, if you have one), and various other things that just come with it. Show me your code after you've worked on it some more. ----------------------------------- Qamar Tue Apr 29, 2008 8:15 am Re: Making a quiz ----------------------------------- okay so i finished my assignment. and this is how it went... /** * Created By: Qamar * This program creates a quiz out of 30 questions and * randomly selects 25 questions and then tells you your answer. * Created: April 17 2008 */ import javax.swing.*;// imports the superclass that allows for use of GUI import java.util.Random; // imports the random class public class Java_Quiz { // public static void main(String[] args) {// String[] Qs = {"What does OOP stand for?", "Which line of code prints out words?", "How do you comment a line in Java?", "Which line converts the string input into a float?", "How do you make an integer?", "What does ??args?? stand for?", "What kind of programming language does Java use?", "How would you print ??Hello?? on the screen?", "How does Bluej accept the value ??x1?? as an integer?", "What does FLOAT do (when insterted into the program properly)?", "What does % do?", "How would you square root x1?", "How do you print on a line?", "How do you make the program accept the name?", "What do you put at the end of a piece of code?", "What can a string do?", "What is missing with this line of code?: ??num = 5(4);??", "What do you start a string or class with?", "What does commenting do?", "What is the proper term to randomize?", "How does ?while? work, when inserted into the code correctly?", "What should go at the top of your program?", "How do you import all of the Java classes?", "Java programming language can run on any platform because...", "What is the purpose of the main method?", "What does ?System.out.print? do?", "When trying to add marks in a multiple choice quiz, what statement would work?", "A class cannot be declared...", "Following code will result in: class A { int b = 1; public static void main(String [] args) { System.out.println(?b is ? + b); }}", "Following code will result in: int a1 = 5; double a2 = (float)a1; ..."}; String[] As = {"1) Official Or Protocol", "1) Print.String.", "1) //", "1) num = Float.parse (reader.readLine())", "1) int num1;", "1) an onomatopoeia", "1) Object-Orientated", "1) put ??Hello??", "1) get x1;", "1) it makes it possible to have a decimal value with a whole number", "1) divides a number", "1) SquareRoot(x1):", "1) System.out.print(line)", "1) name = (reader.readLine());", "1) /", "1) can hold numbers (it?s numerical value) and words", "1) +", "1) {", "1) changes an integer into a double", "1) randomize", "1) while works like an ??if?? and a loop", "1) your name", "1) import java.io.*;", "1) Java is written in C++", "1) To build a user interface", "1) lets you write something while the program is running", "1) while", "1) Static", "1) Complication error", "1) Compilation error"}; String[] Bs = {"2) Object Oriented Programming", "2) System.out.println", "2) %", "2) num = float.parse (reader.readLine())", "2) make an int num1;", "2) an argument", "2) Array", "2) put (??Hello??)", "2) accept x1;", "2) it makes the program lighter", "2) multiplies a number", "2) Math.sqrt(x1);", "2) System.out.println", "2) name = (reader.readline());", "2) :", "2) can only hold numbers", "2) /", "2) (", "2) allows others to rate your coding skills", "2) randint", "2) while works like a loop", "2) the date", "2) JavaImportAll;", "2) The Java Virtual Machine1(JVM) interprets the program for the native operating system", "2) To create buttons and scrollbars", "2) lets you write something before you run the program", "2) if", "2) Private", "2) Runtime exception", "2) Runtime error"}; String[] Cs = {"3) Ontario Organized Police", "3) system.out.println", "3) \\", "3) num = Float.parseFloat(reader.readLine())", "3) integer num1;", "3) it stands for nothing", "3) Logic", "3) System.out.print(??Hello??);", "3) x1 = Integer.parseInt(reader.readLine());", "3) it acts the same way as integer, there?s no real difference", "3) divides a number and shows the remainder", "3) Squareroot(x1);", "3) System.out.printline", "3) name = (reader.readLine()):", "3) ;", "3) can only hold words", "3) *", "3)