Write Java program to Calculate Perimeter of a Circle
This is a Java program that calculates the perimeter of a circle given its radius.
- The program first declares a double variable r to store the radius of the circle.
- It then prompts the user to enter the radius of the circle using the nextDouble() method of the Scanner class.
- To calculate the perimeter of the circle, the program uses the formula perimeter = 2 * PI * radius, where PI is the mathematical constant π (approximately equal to 3.14).
- The program calculates the perimeter by multiplying the radius by 2, multiplying the result by π, and storing the final result in a double variable named per.
- Finally, the program outputs the calculated perimeter to the console using the print() method, preceded by a string indicating that the value being printed is the perimeter of the circle.
Source Code
import java.util.Scanner;
public class Perimeter_Circle
{
public static void main(String[] args)
{
double r;
Scanner input = new Scanner(System.in);
System.out.print("Enter the Radius of Circle : ");
r = input.nextDouble();
double per = 2 * 3.14 * r;// circle parameter = 2PIr
System.out.print("Perimeter of Circle : " + per);
}
}
Output
Enter the Radius of Circle : 45
Perimeter of Circle : 282.6