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write a class Circle with one double data radius . write motheds :::
public Circle(),public Circle (double),public Circle (Circle c)
public double getRadius()
public setRadius (double)
public getPerometer(int)where the parameter indicates the number of terms for π
public getArea (int) where the parameter indicates the number of term for π
public String toString ()
public Boolean equals( Circle c)
private double getpi(int) which returns the value of π corresponding to the specified number of terms ..
...finally test your class in main

/**
 * @(#)Circlee.java
 *
 *
 * @author 
 * @version 1.00 2011/10/17
 */


public class Circlee {
 private double raduis;
public Circle(){
raduis=1;
}
public Circle(double rad){
 raduis=rad;
 }
 
public String toString(){
return 	"("+raduis+")";
 
}

}
    
    
}

if you can help me to understand this question .plz
i realy need to understand because i have tommorow exam and its will help me ..
all thanks ...

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Last Post by hiddepolen
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First of all, use capital letters to ask questions and write normal sentences.
Your question in terms of steps, I am not on a write your code for you.
- Make all the methods in your class, empty.
- Think of what each method should actually do (e g the method getRadius, should return the radius).
- Write perimeter in stead of perameter.
- Use a general form for writing your methods, like getPerimeter(), GetPerimeter() or getperimeter(), and use that throughout your entire program.

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i have error with the type ..
can you correct me plz

public class Circle {
private double raduis;
public Circle(){
	raduis =0.0;
}
  public Circle (double rad){
  	raduis=rad;
  }
  	public Circle(Circle c){
  		raduis=c.getRaduis();
  	}
  		public void setRaduis(double rad){
  			raduis=rad;
  		}
  		public double getRaduis(){
  			return raduis;
  		}
  		public int getPerimeter(int perimeter){
  			perimeter=2*(Math.PI)*(int)raduis;
return perimeter;

  		}
  		public int getArea(int area){
  			 area=(Math.PI)*(int)raduis*(int)raduis;
  			return area;
  		}

}
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Are you a native English speaker? You write radius with i-u... (doesn't really matter)

Where do you get an error? Which line? And do far it looks good. Just keep going like this, and use your logic.

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perimeter=2*(Math.PI)*(int)raduis;
area=(Math.PI)*(int)raduis*(int)raduis;

because area is int and raduis is double ??
how i can write this step ....
private double getpi(int) which returns the value of π corresponding to the specified number of terms ..

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Are you a native English speaker? You write radius with i-u... (doesn't really matter)

QUOTE]
actully no ..
i starting to learn english

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OK, that's great, you're doing quite well so far :). I am just asking you to type with normal sentences and capital letters.

The problem with the area: Change the type of area and the return type of the method to double. Also, you do not need a input in the method getArea(). Only a return value.

public double getArea(){
  			 return Math.PI*Math.pow(raduis,2); // You can return without making a variable.
  		}

Explanation: Every time you cast a double variable to int, you lose all the information behind the decimal point. So to return a double, and keep all the information you return as it is.
If you must return an int, use the following code:

public int getArea(){
  			 return (int) (Math.PI*Math.pow(raduis,2));
  		}

If the area is 3.99237, the method will return 3.

Edited by hiddepolen: n/a

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public double getPerimeter( ){
  		 return 2*(Math.PI)* raduis;
  		}
  		public double getArea( ){
  			 return Math.PI*Math.pow(raduis,2);
  		}

public getPerometer(int)where the parameter indicates the number of terms for π
public getArea (int) where the parameter indicates the number of term for π
now the above method i wroted correctly ?


private double getpi(int) which returns the value of π corresponding to the specified number of terms ..
... is this mean to write private double Pi=3.14 ;

Edited by programing: n/a

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The code you wrote looks perfect to me.

The methods you have to make for your assignment seem a little stupid to me, I don't really understand their meaning.
The only idea I can come up with, is the number of decimals PI should have in the calculation. You could use the DecimalFormat class for that, I don't have any experience there, you should Google it.

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