Question

a Java program to generate the area of circle

Answer 1

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class AreaofCircle{
　　　public static void main()
　　　{
　　　　　{
　　　　　int r = 7;
　　　　　int Area = 22/7 * 7 * 7;
　　　　　System.out.println("Area of circle = " + Area);

　　　　　}
　　　　　}
　　　}

　　　　　　　　Output

Area of circle = 154

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Java is a predifined computer specialized coding.

Java follows some rules in the programs.

Answer 2

CODE

import java.util.*;

class area

{

public static void main ( String args [] )

{

Scanner sc=new Scanner(System.in);

System.out.println("Enter the radius");

int r=sc.nextInt();

double pi=3.14;

double area = pi*r*r;

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

}

}

}

The program first takes the radius as input.

Then we print the area using the formula of circle.