Program to find Area of a Triangle in Java

Table of Contents

The program to find the area of a triangle is a simple program that demonstrates the program structure of Java. It is intended for beginner level learner of Java programming.

Also, we used NetBean 8.2 on a windows 7 64-bit with Java SDK 8u111 to write this program.

To help you understand the program read following sections – problem definition, flowchart, program code for practice and verified output.

Problem Definition

A triangle is a geometric shape with 3 sides and sum of internal angles make 180 degrees.The following figure shows a triangle with three sides.

Figure 1 - Triangle with Base and Height — Figure 1 – Triangle with Base and Height

To find the area of a triangle you need to know the length of base and the length of height and use the following formula.

Area of Triangle = base * (height /2) 
Or 
Area of Triangle = b * (h/2)

Flowchart

Program Code

/*
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 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

package JavaExamples;
import java.io.*;
/**
 *
 * @author Admin
 */
public class AreaTriangle {

public static void main(String args[])
{

    int b, h;
    float area;

    try {

        DataInputStream d = new DataInputStream((System.in));

        System.out.println("Enter value for Base:");

        String st = d.readLine();

        System.out.println("Enter value for Height:");

        String sh = d.readLine();

        b = Integer.parseInt(st);

        h = Integer.parseInt(sh);

        System.out.println("b=" + b);

        System.out.println("h=" + h);

        area = (b * h) / 2;

        System.out.println("Area of triangle=" + area);

        } catch (IOException e)   {

            System.out.println("Wrong Input");

        }

    }

}

Output – Area Of Triangle

Enter value for Base:

20

Enter value for Height:

12

b=20

h=12

Area of triangle= 120.0