Question

a program for generating area of circle

Answer 1

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

____________________________________________________________________________________

Java is a predifined computer specialized coding.

Java follows some rules in the programs.

Answer 2

import java.util.Scanner;
public class Area
{
public static void main(String[] args)
{
int r;
double pi = 3.14, area;
Scanner s = new Scanner(System.in);
System.out.print("Enter radius of circle:");
r = s.nextInt();
area = pi * r * r;
System.out.println("Area of circle:"+area);
}
}
Output:

$ javac Area.java
$ java Area
 
Enter radius of circle:5
Area of circle:78.5