Java
Write a program that prompt the user to enter a decimal number representing the radius of a circle. If the number is greater or equal to zero, the program displays the area of the circle. Otherwise, the program displays “negative input”
CircleAreaDemo.java
import java.util.Scanner;
public class CircleAreaDemo {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
System.out.println("Enter the radius of a circle: ");
double radius = scan.nextDouble();
if(radius>=0) {
double area = Math.PI * radius * radius;
System.out.println("Circle Area: "+area);
} else {
System.out.println("negative input");
}
}
}
Output:
Enter the radius of a circle:
8
Circle Area: 201.06192982974676
Enter the radius of a circle:
-1
negative input
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