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icang [17]
3 years ago
8

Write a program that reads the lengths of the sides of a triangle from the user. Compute the area of the triangle using Heron's

formula (below), in which s represents half of the perimeter of the triangle and a, b, and c represent the lengths of the three sides. Print rhe area to three decimal places.
Area= √ s(s-a)(s-b)(s-c)
Computers and Technology
1 answer:
slamgirl [31]3 years ago
3 0

Answer:

The java program is as follows.

import java.util.Scanner;

import java.lang.*;

public class Area

{

   //variables to hold the values

   static double a, b, c;

   static double s;

   static double area;

public static void main(String[] args) {

    //scanner class object created

    Scanner sc = new Scanner(System.in);

 System.out.print("Enter the first side: ");

 a=sc.nextInt();

 System.out.print("Enter the second side: ");

 b=sc.nextInt();

 System.out.print("Enter the third side: ");

 c=sc.nextInt();

 s=(a+b+c)/2;

 //function of Math class used

 area = Math.sqrt( s*(s-a)*(s-b)*(s-c) );

 //result displayed with 3 decimal places

 System.out.printf("The area of the triangle is %.3f", area);  

}

}

OUTPUT

Enter the first side: 1

Enter the second side: 1

Enter the third side: 1

The area of the triangle is 0.433

Explanation:

1. The variables to declare the three sides of the triangle, the semi-perimeter and the area of the triangle are declared with double datatype. All the variables are declared at class level and hence, declared with keyword, static.  

2. Inside main(), an object of the Scanner class is created.

Scanner sc = new Scanner(System.in);

3. Using the Scanner class object, user input is taken for all the three sides of the triangle.

4. Following this, the semi-perimeter is computed as shown.

s=(a+b+c)/2;

5. The area of the triangle is computed using the given formula which is implemented as shown.

area = Math.sqrt( s*(s-a)*(s-b)*(s-c) );

6. The sqrt() method of the Math class is used while computing the area of the triangle.

7. The area is displayed with three decimals. This is done using the printf() method as shown.

System.out.printf("The area of the triangle is %.3f", area);

8. The program is saved with the same name as the name of the class having the main() method.

9. The class having the main() method is always public.

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import javafx.application.Application;

import javafx.stage.Stage;

import javafx.scene.Scene;

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import javafx.scene.layout.StackPane;

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public class Assignment6 extends Application {

private TabPane tabPane;

private CreatePane createPane;

private SelectPane selectPane;

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public void start(Stage stage) {

StackPane root = new StackPane();

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tabPane.getTabs().addAll(tab1, tab2);

root.getChildren().add(tabPane);

Scene scene = new Scene(root, 900, 400);

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stage.setScene(scene);

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{

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}

}

import java.util.ArrayList;

import javafx.scene.layout.HBox;

import javafx.event.ActionEvent; //**Need to import

import javafx.event.EventHandler; //**Need to import

public class CreatePane extends HBox {

ArrayList<Club> clubList;

private SelectPane selectPane;

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public CreatePane(ArrayList<Club> list, SelectPane sePane) {

this.clubList = list;

this.selectPane = sePane;

}

//using the toString method of the Club class.

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//if ( //---- )

//{

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//}

//else //for all other cases

//{

//when a non-numeric value was entered for its number of

members

//and the button is pushed

//you will need to use try & catch block to catch

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//When a club of an existing club name in the list

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//and display a message "Club not added - duplicate"

//at the end, don't forget to update the new arrayList

//information on the SelectPanel

//}

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} //end of ButtonHandler class

}

import javafx.scene.control.Label;

import javafx.scene.control.CheckBox;

import javafx.scene.layout.*;

import javafx.event.ActionEvent; //**Need to import

import javafx.event.EventHandler; //**Need to import

import java.util.ArrayList;

import javafx.collections.ObservableList;

import javafx.scene.Node;

//import all other necessary javafx classes here

public class SelectPane extends BorderPane {

private ArrayList<Club> clubList;

//constructor

public SelectPane(ArrayList<Club> list) {

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//SelectPane is a BorderPane - add the components here

} //end of constructor

//This method uses the newly added parameter Club object

//to create a CheckBox and add it to a pane created in the constructor

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public void updateClubList(Club newClub)

{

//-------

}

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private class SelectionHandler implements EventHandler<ActionEvent> {

//Override the abstact method handle()

public void handle(ActionEvent event){

//When any radio button is selected or unselected

//the total number of members of selected clubs should be updated

//and displayed using a label.

}

} //end of SelectHandler class

} //end of SelectPane class

public class Club {

private String clubName;

private int numberOfMembers;

private String university;

//Constructor to initialize all member variables

public Club() {

clubName = "?";

university = "?";

numberOfMembers = 0;

}

//Accessor method for club name

public String getClubName() {

return clubName;

}

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public String getUniversity() {

return university;

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public int getNumberOfMembers() {

return numberOfMembers;

}

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clubName = someClubName;

}

//mutator/modifider method for university

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}

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public void setNumberOfMembers(int someNumber) {

numberOfMembers = someNumber;

}

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university

public String toString() {

String result = "\nClub Name:\t\t" + clubName

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+ "\nUniversity:\t\t" + university

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return result;

}

}

Explanation:

4 0
4 years ago
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