# Write Java Code and Run

1 min read**Online Java Compiler.**

Code, Compile, Run and Debug java program online.

**Write your code in this editor and press “Run” button to execute it.**

**Sample Solution**:

Write a Java program to print the area and perimeter of a circle.

**In geometry, the area enclosed by a circle of radius r is πr**^{2}**. Here the Greek letter π represents a constant, approximately equal to 3.14159, which is equal to the ratio of the circumference of any circle to its diameter.**

**The circumference of a circle is the linear distance around its edge.**

**Pictorial Presentation:**

**Why is the ****area of a circle**** of a circle pi times the square of the radius? **

**Java Code:**

```
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner io = new Scanner(System.in);
System.out.println("Input the radius of the circle: ");
double radius = io.nextDouble();
System.out.println("Perimeter is = " + (2 * radius * Math.PI));
System.out.println("Area is = " + (Math.PI * radius * radius));
}
}
```

Output:

Input the radius of the circle: 5

Perimeter is = 31.41592653589793

Area is = 78.53981633974483

**Flowchart:**