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Java Program: Validate Triangle Using Sum of Angles

Triangle Validity Rule

A triangle is valid if and only if:

  • Each angle > 0
  • Sum of all three angles = 180°
Java 
import java.util.Scanner;


 


public class TriangleValidation {


    public static void main(String[] args) {


 


        Scanner sc = new Scanner(System.in);


 


        System.out.print("Enter first angle: ");


        int a = sc.nextInt();


 


        System.out.print("Enter second angle: ");


        int b = sc.nextInt();


 


        System.out.print("Enter third angle: ");


        int c = sc.nextInt();


 


        System.out.println("\n------ Triangle Validation ------");


 


        if (a > 0 && b > 0 && c > 0 && (a + b + c) == 180) {


            System.out.println("The triangle is VALID.");


        } else {


            System.out.println("The triangle is NOT VALID.");


        }


 


        sc.close();


    }


}

Output

 
OUTPUT 1:

INPUT : 
Enter first angle: 60
Enter second angle: 60
Enter third angle: 60

OUTPUT : 
------ Triangle Validation ------
The triangle is VALID.


OUTPUT 2:

INPUT : 
Enter first angle: 90
Enter second angle: 45
Enter third angle: 45

OUTPUT : 
------ Triangle Validation ------
The triangle is VALID.
 
OUTPUT 3:

INPUT : 
Enter first angle: 0
Enter second angle: 90
Enter third angle: 90

OUTPUT : 
------ Triangle Validation ------
The triangle is NOT VALID.

Explanation

1. Input Angles

int a = sc.nextInt();

int b = sc.nextInt();

int c = sc.nextInt();

  • Reads three angles of the triangle.

2. Triangle Validation Condition

if (a > 0 && b > 0 && c > 0 && (a + b + c) == 180)

✔ a > 0 && b > 0 && c > 0
Ensures no angle is zero or negative.

✔ (a + b + c) == 180
Checks triangle angle sum rule.

3. Logical Operators Used

Operator

Purpose

&&

Logical AND

> 

Comparison

==

Equality

 

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