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BOOK: Java Programming 24-Hour Trainer by Yakov Fain
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Old September 4th, 2011, 11:16 PM
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Default Lesson 4

I am new to Java and bought Java programming 24 hr trainer to hopefully get a jump start on a class I am taking. But I am having problems with Lesson 4.
I have the program calculating tax, but I am struggling with converting the tax to euros. I am unsure as to how to add another static function. Can someone point me in the right direction?

This is my code:
Code:
class Tax {	
	 double grossIncome;     //class member variables
	 String state;
	 int dependents;
	 static int customerCounter;
	 static double euros;
	 
	 
	// First Constructor
	Tax (double gi, String st, int depen, double euros){
		this.grossIncome = gi;    //member variable initialization
		this.state = st;
		this.dependents=depen;
		customerCounter++;   // increment the counter by one
		
		//results
		System.out.println("Prepare the tax data for customer #" + customerCounter);
	}
	//Second Constructor
	Tax (double gi, int depen, double euros){
		this(gi, "NY", depen, euros);
	}
	public double calcTax(){
		return (grossIncome*0.033 - dependents*100);
		
	}
	public double convert(){
		return (calcTax()*1.25);
	}
}
Code:
class TestTax {
	 public static void main (String[] args){
		 double grossIncome;     //local variables
		 double euros;
		 String state;
		 int dependents;
		 
		 
		 grossIncome = 75000;
		 dependents = 2;
		 euros = 1.25;
		 state = "NJ";
		 
		 Tax   t = new Tax(grossIncome, state, dependents, euros);
		 
		 double yourTax = t.calcTax(); //calculating tax
		// double convTax = t.convert(); // calculating euros
		 
		 //print results
		 System.out.println("Your tax is $" + yourTax);
		 System.out.println("Your tax in euros is $" + yourTax);
		 
		 
	 }

}
Also, I can't seem to open the code that accompanies this text. I can download the files but they arror out when I try to open them in Eclipse. I don't know what I am doing wrong. Can you help with that also?

Thank you for any assistance.

MTheys
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Old September 5th, 2011, 01:56 PM
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Default

Add something like this to your first class (Tax) and call it using Tax.convertToEuros(...).

Code:
	 static double  convertToEuros(double dollars) {
		 double euros = dollars * 1.25;
		 return euros;
	 }
You should be able to find solutions at http://code.google.com/p/practicaljava/.
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Old September 15th, 2011, 02:40 AM
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Default Lesson 4

Mtheys

I've just started to learn how to program in Java, what have I done is assigned 1.25 to the variable convertToEuros as this is a static value.

Also to convert from dollars to euros you need to divide dollars by euros.

Below is my code I think I'm going in the right direction.

Code:
class Tax {
	double grossIncome;//class variables
	String state;
	int dependents;
	static int customerCounter;
	static double convertToEuros = 1.25;
	double dollars;
	//Constructor
	Tax (double gi, String st, int depen){
		grossIncome = gi;// member variable initialisation
		state = st;
		dependents = depen;
		customerCounter ++; //increment the counter by one
		System.out.println("Preparing tax data for customer #" + customerCounter);
	}
		public double calcTac(){
			return (grossIncome * 0.33 - dependents * 100);
		}
		public double convertTaxEuros(){
			dollars = grossIncome *0.33 - dependents * 100;
			
			return (dollars / convertToEuros);
		}
Code:
class TestTax {

	public static void main(String[] args) {
		double grossIncome; //local variables
		String state;
		int dependents;
		
		grossIncome = 50000;
		dependents = 2;
		state = "NJ";
		
		Tax t = new Tax(grossIncome, state, dependents);
		
		double yourTax = t.calcTac(); //calculating tax
		double yourTaxToEuro = t.convertTaxEuros();
		
		Tax t2 = new Tax(65000, "TX", 4);
		double hisTax = t2.calcTac();
		double hisTaxToEuro = t2.convertTaxEuros();
		
		//Print Result
		
		System.out.println("Your tax is $" + yourTax);
		System.out.println("Your tax in Euros is " + yourTaxToEuro);
		System.out.println("His tax is $" + hisTax);
		System.out.println("His tax in Euros is " + hisTaxToEuro);

	}

}
Hope this helps and if I'm not going in the right direction can someone please point me there.
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Old September 15th, 2011, 05:02 AM
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Default

wasn't happy with the output

Preparing tax for customer #1
Preparing tax for customer #2
Results....

So I formatted the testTax code below
Code:
class TestTax {
	public static void main(String[] args) {
		double grossIncome; //local variables
		String state;
		int dependents;
		
		grossIncome = 50000;
		dependents = 2;
		state = "NJ";
		
		Tax t = new Tax(grossIncome, state , dependents);
	
			double yourTax = t.calcTax();//calculating tax
			double yourTaxEuros = t.convertTaxEuros();
			
			
			
			//Printing Result
			System.out.println("Your tax is " + yourTax);
			System.out.println("Your tax in Euros " + yourTaxEuros);
		
		Tax t2 = new Tax(65000, "TX", 4);
			
			double hisTax = t2.calcTax();
			double hisTaxEuros = t2.convertTaxEuros();
			
			//Printing Result
			System.out.println("His tax is " + hisTax);
			System.out.println("His tax in Euros " + hisTaxEuros);
			
		Tax t3 = new Tax(79000, "FL", 6);
		
			double t3Tax = t3.calcTax();
			double t3TaxEuros = t3.convertTaxEuros();
			
			//Printing Result
			System.out.println("Customer #" + Tax.customerCounter + " tax is $" + t3Tax);
			System.out.println("Customer #" + Tax.customerCounter + " tax in Euros " + t3TaxEuros);
		
		}
the output now flows better and is easier to read.

Preparing the tax data for customer #1
Your tax is 16300.0
Your tax in Euros 13040.0
Preparing the tax data for customer #2
His tax is 21050.0
His tax in Euros 16840.0
Preparing the tax data for customer #3
Customer #3 tax is $25470.0
Customer #3 tax in Euros 20376.0
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