The java program below uses Math.PI property of java that returns approx 3.14159. The program takes the user input for the value of radius and calculates using the formula of Area and Circumference of a circle and displays the output accordingly.
Java Program to Calculate the Area and Circumference of a Circle
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | //Area and circumference of circle import java.util.Scanner; public class AreaCircumCircle { public static void main(String args[]) { Scanner sc = new Scanner(System.in); System.out.print("Enter the radius: "); double radius = sc.nextDouble(); //Area = PI*radius*radius double area = Math.PI * (radius * radius); System.out.println("The area of a circle is: " + area); //Circumference = 2*PI*radius double circumference= Math.PI * 2*radius; System.out.println( "The circumference of a circle is:"+circumference) ; } } |
Output:
Enter the radius: 7
The area of a circle is: 153.93804002589985
The circumference of a circle is:43.982297150257104