In the previous article, we have seen Java Program to Find Arc Length from Given Angle

In this article we are going to see how to find circumference of a circle using Java programming language.

## Java Program to Find Circumference of a Circle

Before Jumping into the program directly let’s see how we can find circumference of a circle.

**Explanation:**

Let us assume there is a circle with radius “r” Then the circumference of the circle is 2*pi*r

**Example: **

Radius of the circle “r” = 4 Circumference of the circle “C” = 2*pi*r = 2*3.14*4 = 25.12 Where pi = 3.14

Let’s see different ways to find circumference of a circle.

### Method-1: Java Program to Find Circumference of a Circle By Using Static Value

**Approach:**

- Declare a double variable say ‘
`r`

’ and assign the value to it, which holds the value of radius of the circle. - Declare a double variable say ‘
`pi`

’ and assign the value to it, which holds the value 3.14. - Declare a double variable say ‘
`c`

’ which will hold the value of circumference of the circle, which we will get by using the formula`2*pi*r`

- Print the result.

**Program:**

class Main { public static void main(String [] args) { //raius value declared double r = 4; //pie value declared double pi = 3.14; // formula to find circumference of the circle double c = 2 * pi * r; System.out.println("The circumference of the circle is: " + c); } }

Output: The circumference of the circle is: 25.12

### Method-2: Java Program to Find Circumference of a Circle By Using User Input Value

**Approach:**

- Declare a double variable say ‘
`r`

’ which holds the value of radius of the circle, take the value of ‘`r`

‘ as user input. - Declare a double variable say ‘
`pi`

’ which holds the value 3.14. - Declare a double variable say ‘
`c`

’ which will hold the value of circumference of the circle, which we will get by using the formula`2*pi*r`

- Print the result.

**Program:**

import java.util.*; class Main { public static void main(String [] args) { //Scanner class object created Scanner s = new Scanner(System.in); //Taking user input of raius value System.out.println("Enter the value of radius of the circle: "); double r = s.nextDouble(); //pie value declared double pi = 3.14; // formula to find circumference of the circle double c = 2 * pi * r; System.out.println("The circumference of the circle is: " + c); } }

Output:

Enter the value of radius of the circle: 5 The circumference of the circle is: 31.400000000000002

The best and excellent way to learn a java programming language is by practicing Simple Java Program Examples as it includes basic to advanced levels of concepts.

**Related Java Articles:**