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Thread: case 3

  1. #1
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    Default case 3

    How do I start a new case after the given code? Do I start a new method?
    import javax.swing.*;
     
    import java.awt.*;
     
    public class CplusPlus extends java.applet.Applet {
     
     
    	String statement = "a single set of commands";
    	String comment = "a line or portion of a line that is ignored by the C++ compiler";
    	String declaration = " a statement that defines a variable";
    	String variable = " a holding place in the computer's memory" +
    			" to store a value of some type";
    	String expression = " a command that has a value";
    	String operator = " a command that generates a value";
     
    	String vocabulary = "a statement is " + statement + "\na comment is " + comment + 
    	"\na declaration is " + declaration + "\na variable is " + variable + "\nan expression is " + 
    	expression + "an operator is " + operator;
    	TextArea letter;
     
     
    	public void init(){
     
    		String chapters = JOptionPane.showInputDialog("chapter1\n" + "chapter2\n"
    				+ "chapter3\n" + "chapter4\n");
    		int choice = Integer.parseInt(chapters);
    		switch(choice){
    		case 1:		
    		String statement = "a single set of commands";
    		String comment = "a line or portion of a line that is ignored by the C++ compiler";
    		String declaration = " a statement that defines a variable";
    		String variable = " a holding place in the computer's memory" +
    				" to store a value of some type";
    		String expression = " a command that has a value";
    		String operator = " a command that generates a value";
     
    		//TextArea initializing
     
    		String letter = "Learn this mom. I made this for you! Study well because a test will follow. " + "\n\n\na statement is " + 
    		statement + "\na comment is " + comment + "\na declaration is " + declaration +
    		"\na variable is " + variable + "\nan expression is " + expression + "\nan operator is " + operator + "\n\n\nan " +
    				"expression example is int x = 3;" + "\na declaration example is JTextArea outputArea; " + "\na comment example is // initializing" +
    				"\na variable example is output" + "\nanother variable example is x " + "\na statement example is System.out.println();" +
    				"\nan operator example is = " + "\nanother operator example is - " + "\nanother operator example is + ";
    		;
    		TextArea let;
    	let = new TextArea(letter,40,90);
    	add(let);
    	JOptionPane.showMessageDialog(null,let);
     
    		//Quiz
     
    		JOptionPane.showMessageDialog(null,"what is a statement");
    		String answer = JOptionPane.showInputDialog("A - " + statement + "\n" +
    				"B - " + comment + "\n" + "C - "  + 
    				declaration + "\n" + "D - " + variable + "\n" + "E - " + expression
    				 + "\n" + "F - " + operator);
    		if(answer.equals("A"))
    			JOptionPane.showMessageDialog(null,"correct");
    		else
    			JOptionPane.showMessageDialog(null,"incorrect");
     
    		//introducing the new question
     
    		JOptionPane.showMessageDialog(null,"what is a comment");
    		String answer2 = JOptionPane.showInputDialog("A - " + statement + "\n" +
    				"B - " + comment + "\n" + "C - "  + 
    				declaration + "\n" + "D - " + variable + "\n" + "E - " + expression
    				 + "\n" + "F - " + operator);
    		if(answer2.equals("B"))
    			JOptionPane.showMessageDialog(null,"correct");
    		else
    			JOptionPane.showMessageDialog(null,"incorrect");
     
    		//introducing the new question
     
    		JOptionPane.showMessageDialog(null,"what is a variable");
    		String answer3 = JOptionPane.showInputDialog("A - " + statement + "\n" +
    				"B - " + comment + "\n" + "C - "  + 
    				declaration + "\n" + "D - " + variable + "\n" + "E - " + expression
    				 + "\n" + "F - " + operator);
    		if(answer3.equals("D"))
    			JOptionPane.showMessageDialog(null,"correct");
    		else
    			JOptionPane.showMessageDialog(null,"incorrect");
     
    //introducing the new question
     
    		JOptionPane.showMessageDialog(null,"what is a declaration");
    		String answer4 = JOptionPane.showInputDialog("A - " + statement + "\n" +
    				"B - " + comment + "\n" + "C - "  + 
    				declaration + "\n" + "D - " + variable + "\n" + "E - " + expression
    				 + "\n" + "F - " + operator);
    		if(answer4.equals("C"))
    			JOptionPane.showMessageDialog(null,"correct");
    		else
    			JOptionPane.showMessageDialog(null,"incorrect");
    //introducing the new question
     
    		JOptionPane.showMessageDialog(null,"what is an operator");
    		String answer5 = JOptionPane.showInputDialog("A - " + statement + "\n" +
    				"B - " + comment + "\n" + "C - "  + 
    				declaration + "\n" + "D - " + variable + "\n" + "E - " + expression
    				 + "\n" + "F - " + operator);
    		if(answer5.equals("F"))
    			JOptionPane.showMessageDialog(null,"correct");
    		else
    			JOptionPane.showMessageDialog(null,"incorrect");
    //introducing the new question
     
    		JOptionPane.showMessageDialog(null,"what is an expression");
    		String answer6 = JOptionPane.showInputDialog("A - " + statement + "\n" +
    				"B - " + comment + "\n" + "C - "  + 
    				declaration + "\n" + "D - " + variable + "\n" + "E - " + expression
    				 + "\n" + "F - " + operator);
    		if(answer6.equals("E"))
    			JOptionPane.showMessageDialog(null,"correct");
    		else
    			JOptionPane.showMessageDialog(null,"incorrect");
     
    		// example questions
     
    		JOptionPane.showMessageDialog(null,"what is an example of a statement?");
    		String example = ("int x = 3;");
    		String example2 = ("JTextArea outputArea;");
    		String example3 = (" // initializing");
    		String example4 = ("output");
    		String example5 = ("System.out.println();");
    		String option = JOptionPane.showInputDialog("A - " + example + "\n" + "B - " + example2 +
    				"\n" + "C - " + example3 + "\n" + "D - " + example4 + "\n" + "E - " + example5 + "\n");
    		if(option.equals("E"))
    			JOptionPane.showMessageDialog(null,"correct");
    		else
    			JOptionPane.showMessageDialog(null,"incorrect");
     
    // examples
     
    		JOptionPane.showMessageDialog(null,"what is an example of a comment?");
     
    		String option2 = JOptionPane.showInputDialog("A - " + example5 + "\n" + "B - " + example2 +
    				"\n" + "C - " + example3 + "\n" + "D - " + example4 + "\n" + "E - " + example);
    		if(option2.equals("C"))
    			JOptionPane.showMessageDialog(null,"correct");
    		else
    			JOptionPane.showMessageDialog(null,"incorrect");
     
    // examples
     
    		JOptionPane.showMessageDialog(null,"what is an example of a declaration?");
     
    		String option3 = JOptionPane.showInputDialog("A - " + example5 + "\n" + "B - " + example2 +
    				"\n" + "C - " + example3 + "\n" + "D - " + example4 + "\n" + "E - " + example);
    		if(option3.equals("B"))
    			JOptionPane.showMessageDialog(null,"correct");
    		else
    			JOptionPane.showMessageDialog(null,"incorrect");
    // examples
     
    		JOptionPane.showMessageDialog(null,"what is an example of a variable?");
     
    		String option4 = JOptionPane.showInputDialog("A - " + example5 + "\n" + "B - " + example2 +
    				"\n" + "C - " + example3 + "\n" + "D - " + example4 + "\n" + "E - " + example);
    		if(option4.equals("D"))
    			JOptionPane.showMessageDialog(null,"correct");
    		else
    			JOptionPane.showMessageDialog(null,"incorrect");
    // examples
     
    		JOptionPane.showMessageDialog(null,"what is an example of an expression?");
     
    		String option5 = JOptionPane.showInputDialog("A - " + example5 + "\n" + "B - " + example2 +
    				"\n" + "C - " + example3 + "\n" + "D - " + example4 + "\n" + "E - " + example);
    		if(option5.equals("E"))
    			JOptionPane.showMessageDialog(null,"correct");
    		else
    			JOptionPane.showMessageDialog(null,"incorrect");
    		JOptionPane.showMessageDialog(null,"Congratulations! you made it past chapter 1");
    break;
    		case 2:
    			String frame = ""; 
    			TextArea lt;
    			Button lesson1 = new Button("lesson 1");
    			Button exit = new Button("exit");
    			Button lesson2 = new Button("lesson 2");
    			Button lesson3 = new Button("lesson 3");
    			Button lesson4 = new Button("lesson 4");
    			Button lesson5 = new Button("lesson 5");
    			Button lesson6 = new Button("lesson 6");
    			Button lesson7 = new Button("lesson 7");
    			Button lesson8 = new Button("lesson 8");
    			Button lesson9 = new Button ("lesson 9");
    			Button lesson10 = new Button("lesson 10");
    			String output =("memorize this frame as your lesson 1, " +
    					"which is the start of all c++ programs") +
    			 ("\n\n\n #include <iostream>\n") + ("#include <cstdio>") + ("\n#include <cstdlib>")
    			 + ("\n using namespace std;") + ("\nint main(int nNumberofArgs, char* pczArgs[]){");
    			JOptionPane.showConfirmDialog(null, output);
    			JOptionPane.showMessageDialog(null,"now you try");			
    		lt = new TextArea(frame,20,80);
     
    		add(lt);
    		add(lesson1);
    		add(exit);	
    		add(lesson2);
    		add(lesson3);
    		add(lesson4);
    		add(lesson5);
    		add(lesson6);
    		add(lesson7);
    		add(lesson8);
    		add(lesson9);
    		add(lesson10);
    		String output2 	= ("Now learn how to close a program!");
    		System.out.println(output2);
     
    	}
    	}
    		// button action event to guide the user through every lesson
    	public boolean action(Event evt, Object arg){
     
    		String output = ("memorize this frame and write it, which is the start of all c++ programs") +
    		 ("\n\n\n #include <iostream>\n") + ("#include <cstdio>") + ("\n#include <cstdlib>")
    		 + ("\n using namespace std;") + 
    		 ("\nint main(int nNumberofArgs, char* pczArgs[ ]){");	
    		String output2 = "Now learn how to end a program \n\nLearn this, memorize it, now write it!" 
    			+ "\n\n\nSystem(pause);" + "\nreturn 0;";
    		String output3 = "A computer needs to know what kind of variable the user is using to process" +
    		"\nthe program. The kind of variables are expressed by type. In other words, a type is just an identification marker." +
    		"\nTherefore, the most common type for words is String. So, initilizing a string " +
    		"\nwould look like String sEric.\n\nnow you try initializing your name.";
    		String output4 = "The most common type for numbers is double because double can represent fractions and whole numbers." +
    				" \nSo, here is an exampleof a double:\n\ndouble 2.5. \nnow you try writing a double. Type int is used for integers, example:" +
    				"\n\nint 2";
    		String output5 = "A less common type is character. This is used for single letters like a,b,c, etc. \n Example is: \n\nchar d.";
    		String output6 = "When you tell the computer to do a command, it will show as something like this: \n\ncout<< type your name;" + 
    		"\n\nor int nAge; \n//(declaration) \n\ncin>> int nAge; \n//(this is where the user inputs his age) " +
    		"\n\ncout<< Eric is nAge; \n//(statement) + result is: \n//31" + "\n\nnow you try telling the computer to output your age or weight or height";
    		String output7 = "When you tell a user to input a command, it looks like:" + "\nint nAge;" +
    				" \ncin>> int nAge;\n\n//(this is where the user inputs his age and stays in the computer's memory)" + "\nnow you try telling a user"
    				+ "to input his grade point average";
    		String output8 = "now write the frame and tell the computer to output that I love my mom and write the end frame. \nIt should look like this:" +
    		"\n\n#include<iostream>\n#include<cstdlib>\n#include<cstdio>\nusing namespace std;\nint main(int nNumberofArgs, char* pczArgs[]{" + 
    		"\ncout<<I love my mom;\nSystem(pause);\nreturn 0;\n}";
    		String output9 = "a brace ({) must always be closed at some point(}). a statement must always end with a semicolon(;). ";
    		String output10 = "congratulations! you are finished with chapter 2!" + "\n I am very proud of you!";
     
    		if (evt.target instanceof Button){
    			String label = (String)arg;
    			if ( label.equals("lesson 1"))
    			JOptionPane.showMessageDialog(null,output);
     
     
    		else{
    				if(label.equals("exit"))
    					System.exit(0);		
     
    		else	{
     
    		if(label.equals("lesson 2"))
     
    			JOptionPane.showMessageDialog(null,output2);			
     
    		else{
    		if(label.equals("lesson 3"))
    					JOptionPane.showMessageDialog(null,output3);
    		else{
    			if(label.equals("lesson 4"))
    				JOptionPane.showMessageDialog(null,output4);
    			else{
    				if(label.equals("lesson 5"))
    					JOptionPane.showMessageDialog(null,output5);
    				else{
    					if(label.equals("lesson 6"))
    						JOptionPane.showMessageDialog(null,output6);
    					else{
    						if(label.equals("lesson 7"))
    							JOptionPane.showMessageDialog(null,output7);
    						else{
    							if(label.equals("lesson 8"))
    								JOptionPane.showMessageDialog(null,output8);
    							else{
    								if(label.equals("lesson 9"))
    									JOptionPane.showMessageDialog(null,output9);
    								else{
    									if(label.equals("lesson 10"))
    										JOptionPane.showMessageDialog(null,output10);
    		}
    		}
    		}
    		}
    		}
    		}
    		}
    	}
    		}
    		}
    		}
    	return true;	
    			}	
     
    public void finish(){
    }
    case 3:
    }


  2. #2
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    Default Re: case 3


  3. #3
    Super Moderator Norm's Avatar
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    Default Re: case 3

    The formatting of your code make it Very Hard to see the logic. There should be indentations to show nesting.
    Original:
    		switch(choice){
    		case 1:		
    		String statement = "a single set of commands";
    Indented to show nested logic:
    		switch(choice){
    		   case 1:		
    		       String statement = "a single set of commands";
                           ...
                        case 2:
                            ....
                     }
    Having all the statements start in the same column makes it hard to understand the code.
    If you don't understand my answer, don't ignore it, ask a question.

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