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# Java Program to Calculate Area and Circumference of a Circle

This article covers a program in Java that find and prints area and circumference of a circle. Both area and circumference will get calculated based on the radius provided at run-time of the program.

**Note - **The area of a circle is calculated using the formula **3.14*r*r**. Where **r** is the radius value of
circle.

**Note - **The circumference of a circle is calculated using the formula **2*3.14*r**. Where **r** is the radius value
of circle.

**Note - **In above formulae, **3.14** is the value of **Pi** or **π**

## Find Area of Circle in Java

The question is, *write a Java program to calculate area of circle.* The answer to this question is the program given below:

import java.util.Scanner; public class CodesCracker { public static void main(String[] args) { float r, area; Scanner s = new Scanner(System.in); System.out.print("Enter the Radius of Circle: "); r = s.nextFloat(); area = (float)(3.14*r*r); System.out.println("\nArea = " +area); } }

The snapshot given below shows the sample run of above Java program with user input **5** as radius of that circle, whose
area we want to find and print using the program:

In the following statement, of above program:

`area = (float)(3.14*r*r);`

the **float()** is used to convert whatever the value comes out from **3.14*r*r**, into floating-point, to avoid
**Incompatible Error**, i.e., *possible loosy conversion from double to float*. That is, because the type of **area**
variable is declared as **float**, therefore we need to convert the value comes from **3.14*r*r** into **float**

## Find Circumference of Circle in Java

The question is, *write a Java program to calculate circumference of a circle.* The program given below is its answer:

import java.util.Scanner; public class CodesCracker { public static void main(String[] args) { float r, circum; Scanner s = new Scanner(System.in); System.out.print("Enter the Radius of Circle: "); r = s.nextFloat(); circum = (float)(2*3.14*r); System.out.println("\nCircumference = " +circum); } }

Here is its sample run with same user input as of previous program. That is, **5** as radius of circle:

## Calculate Area and Circumference of Circle in Java

This is basically the combined version of previous two programs. That is, I've combined both the program, so that in a single program, we can see the area and circumference both at one execution of the program.

import java.util.Scanner; public class CodesCracker { public static void main(String[] args) { float r, area, circum; Scanner s = new Scanner(System.in); System.out.print("Enter the Radius of Circle: "); r = s.nextFloat(); area = (float)(3.14*r*r); circum = (float)(2*3.14*r); System.out.println("\nArea = " +area); System.out.println("Circumference = " +circum); } }

The sample run of above program, with user input **4.2**, is:

#### Same Program in Other Languages

- C Calculate Area Circumference
- C++ Calculate Area Circumference
- Python Calculate Area of Circle
- Python Calculate Circumference of Circle

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