# Java Exercises: Reads the two adjoined sides and the diagonal of a parallelogram and check whether the parallelogram is a rectangle or a rhombus

## Java Basic: Exercise-229 with Solution

Write a Java program which reads the two adjoined sides and the diagonal of a parallelogram and check whether the parallelogram is a rectangle or a rhombus.

According to Wikipedia-

parallelograms: In Euclidean geometry, a parallelogram is a simple (non-self-intersecting) quadrilateral with two pairs of parallel sides. The opposite or facing sides of a parallelogram are of equal length and the opposite angles of a parallelogram are of equal measure.

rectangles: In Euclidean plane geometry, a rectangle is a quadrilateral with four right angles. It can also be defined as an equiangular quadrilateral, since equiangular means that all of its angles are equal (360°/4 = 90°). It can also be defined as a parallelogram containing a right angle.

rhombus: In plane Euclidean geometry, a rhombus (plural rhombi or rhombuses) is a simple (non-self-intersecting) quadrilateral whose four sides all have the same length. Another name is equilateral quadrilateral, since equilateral means that all of its sides are equal in length. The rhombus is often called a diamond, after the diamonds suit in playing cards which resembles the projection of an octahedral diamond, or a lozenge, though the former sometimes refers specifically to a rhombus with a 60° angle (see Polyiamond), and the latter sometimes refers specifically to a rhombus with a 45° angle.

**Input:**

Two adjoined sides and the diagonal.

1 ≤ ai, bi, ci ≤ 1000, ai + bi > ci

**Pictorial Presentation:**

**Sample Solution:**

**Java Code:**

```
import java.util.*;
public class Main {
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
int count_1 = 0,count_2 = 0;
System.out.println("Input two adjoined sides and the diagonal of a parallelogram (comma separated):");
String[] s = sc.nextLine().split(",");
int len1 = Integer.parseInt(s[0]);
int len2 = Integer.parseInt(s[1]);
int len3 = Integer.parseInt(s[2]);
if(len3*len3 == len1*len1 + len2*len2) count_1++;
if(len1 == len2) count_2++;
if(count_1>0)
System.out.println("This is a rectangle.");
if(count_2>0)
System.out.println("This is a rhombus.");
}
}
```

Sample Output:

Input two adjoined sides and the diagonal of a parallelogram (comma separated): 8,8,8 This is a rhombus.

**Flowchart: **

**Java Code Editor:**

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**Previous:**Write a Java program that reads n digits (given) chosen from 0 to 9 and prints the number of combinations where the sum of the digits equals to another given number (s). Do not use the same digits in a combination.

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## Java: Tips of the Day

** Count the number of occurrences of a char in a String:**

int count = StringUtils.countMatches("a.b.c.d", ".");

Ref: https://bit.ly/2OTy6sG

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