Java program to calculate area of a circle

Today we are going to learn java program to calculate area of a circle.

java program to calculate area of a circle

Java program to calculate area of a circle

Area of circle java is one of the common interview question. Here we are using scanner class to take input from user.

Also Read – circumference of a circle in java

In the below java program user enters radius as input. Then use area of circle formula. Here’s the code and output of java program,

// area = pi * r * r where r is the radius of a circle 

import java.util.Scanner;

public class AreaOfCircleDemo 
{
   public static void main(String[] args) 
   {
      int radius;
      double pi = 3.14, area;
      Scanner sc = new Scanner(System.in);
      System.out.print("Please enter radius of circle : ");
      radius = sc.nextInt();
      area = pi * radius * radius;
      System.out.println("Area of circle : " + area);
      sc.close();
   }
}

Output:
Please enter radius of circle : 5
Area of circle : 78.5