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Triangle Validity Check in Java

Check if three sides can form a valid triangle using triangle inequality.

BeginnerModule 2: Conditional ProgramsExample 13 of 20

triangle-validity-check.java

1import java.util.Scanner;
2
3public class Main {
4    public static void main(String[] args) {
5        Scanner sc = new Scanner(System.in);
6
7        System.out.print("Enter side a: ");
8        int a = sc.nextInt();
9        System.out.print("Enter side b: ");
10        int b = sc.nextInt();
11        System.out.print("Enter side c: ");
12        int c = sc.nextInt();
13
14        if (a + b > c && a + c > b && b + c > a) {
15            System.out.println("Triangle is Valid");
16        } else {
17            System.out.println("Triangle is Not Valid");
18        }
19
20        sc.close();
21    }
22}

Output

Enter side a: 3
Enter side b: 4
Enter side c: 5
Triangle is Valid

What's going on

We use the triangle inequality theorem: sum of any two sides must be greater than the third side.

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