Calculate Circle Perimeter in Java


/* Calculate Circle Perimeter using Java Example */

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
class CirPeri {
public static void main(String[] args) {
int radius = 0;
System.out.println(“Please enter radius of a circle”);
try
{
//get the radius from console
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
radius = Integer.parseInt(br.readLine());
}
//if invalid value was entered
catch(NumberFormatException ne)
{
System.out.println(“Invalid radius value” + ne);
System.exit(0);
}
catch(IOException ioe)
{
System.out.println(“IO Error :” + ioe);
System.exit(0);
}

/*
* Perimeter of a circle is
* 2 * pi * r
* where r is a radius of a circle.
*/

//NOTE : use Math.PI constant to get value of pi
double perimeter = 2 * Math.PI * radius;

System.out.println(“Perimeter of a circle is ” + perimeter);
}
}

Above Java Example shows how to calculate
Perimeter of circle using it’s radius.

output:

cir1

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