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Calculate area of a circle in Java

Input - Question 13

In this question, we will see how to input the radius of a circle in Java programming using the java input and find its area. To know more about java input click on the java input lesson.

Q13) Write a program in Java to input the radius of a circle and find its area. Area of a circle is πr2. Where r is the radius and the value of π (pie) is 22/7 or 3.142

Formula: area = 3.142 * r * r


import java.util.Scanner;

public class Q13
    public static void main(String args[])
        float r,a;
        Scanner sc=new Scanner(System.in);
        System.out.print("Enter radius of a circle ");
        System.out.println("Area=" + a);


Enter radius of a circle 5