Conditional Constructs in Java

Chapter 9

Conditional Constructs in Java

Class 9 - Logix Kips ICSE Computer Applications with BlueJ

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Java Programs - Perimeter and Area of a Triangle (Heron’s Formula)

                $\text{Perimeter} = a + b + c$

                $\text{Area}=\sqrt{s(s-a)(s-b)(s-c)}$

                $\text{Where} \space s = \dfrac{a+b+c}{2}$

import java.util.Scanner;
 
public class TrianglePerimeterArea {
    public static void main(String[] args) {
 
        Scanner sc = new Scanner(System.in);
 
        System.out.print("Enter side a: ");
        double a = sc.nextDouble();
 
        System.out.print("Enter side b: ");
        double b = sc.nextDouble();
 
        System.out.print("Enter side c: ");
        double c = sc.nextDouble();
 
        // Calculate perimeter
        double perimeter = a + b + c;
 
        // Calculate semi-perimeter
        double s = perimeter / 2;
 
        // Calculate area using Heron's formula
        double area = Math.sqrt(s * (s - a) * (s - b) * (s - c));
 
        System.out.println("\n--- Triangle Details ---");
        System.out.println("Perimeter = " + perimeter);
        System.out.println("Area = " + area);
 
        sc.close();
    }
}

Output : 
  SAMPLE INPUT : 
Enter side a: 5
Enter side b: 6
Enter side c: 7

 SAMPLE OUTPUT : 
--- Triangle Details ---
Perimeter = 18.0
Area = 14.696938456699069 

Explanation

1. Input the Three Sides

double a = sc.nextDouble();

double b = sc.nextDouble();

double c = sc.nextDouble();

• Reads the values of sides a, b, and c.

2. Perimeter Calculation

                $\text{Perimeter} = a + b + c$

double perimeter = a + b + c;

3. Semi-Perimeter Calculation

                $\text{Where} \space s = \dfrac{a+b+c}{2}$

double s = perimeter / 2;

4. Area Calculation (Heron’s Formula)

                $\text{Area}=\sqrt{s(s-a)(s-b)(s-c)}$

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