Java Area of Circle Program Example

Write a Program to Calculate Area of Circle(area = PI*r*r)

Method 1:

class AreaOfCircle{

public static void main(String args[])

{

float pi = 3.14f;

int r = 5;

float area;

area = (pi*r*r);

System.out.println("Area of Circle = " + area);

}

}

Output

Area of Circle = 78.5

Method 2:

import java.util.*;

class AreaOfCircle{

public static void main(String args[])

{

float pi = 3.14f;

int r;

float area;

Scanner in = new Scanner(System.in);

System.out.print("Enter r Number ==> ");

r = in.nextInt();

area = (pi*r*r);

System.out.println("Area of Circle = " + area);

}

}

OutPut

Enter r Number ==> 5

Area of Circle = 78.5