Question

WAP to input radius of a circle and print area of circle
today is my exam
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Answer 1

Program :

InputStreamReader Method

import java.io.*;

public class Area

{

public static void main ()throws IOException

{

InputStreamReader isr = new InputStreamReader (System.in);

BufferedReader br = new BufferedReader (isr);

double ar, rad;

System.out.println("Enter the radius of the circle : ");

rad = Double.readDouble(br.readLine());

ar = 22/7*rad*rad;

System.out.println("The Area of the Circle : "+ar);

}

}

Scanner Method

import java.util.*;

public class Area

{

public static void main ()

{

Scanner in = new Scanner (System.in);

double ar,rad;

System.out.println("Enter the radius of the circle : ");

rad = in.nextDouble();

ar = 22/7*rad*rad;

System.out.println("The Area of the circle : "+ar);

}

}