Problem Statement

1Problem Description :  
2Write Algorithm, Flowchart and Program to Find Circumference of a Circle for which Radius is given.  
3 
4Example 1 : 
5
6  Input  : radius is 4 
7  Output : 25.12
8  Explanation :  Circle Circumference formula is 2 * 3.14 * radius
9                 So circumference = 2 * 3.14 * 4 = 25.12
10
11Example 2 : 
12
13  Input  : radius is 5
14  Output : 31.4
15  Explanation :  Circle Circumference formula is 2 * 3.14 * radius
16                 So circumference =  2 * 3.14 * 5 = 31.4

Algorithm

1Input : radius of a circle
2 
3Step 1: Start 
4Step 2: Read radius 
5Step 3: Calculate Circumference, circumference = 2 * 3.14 * radius
6Step 4: Print circumference 
7Step 5: Stop 
8  
9Output: circumference

Flowchart

Code Implementation

1import java.util.Scanner;
2
3public class CircumferenceOfACircle {
4
5    public static void main(String[] args) {
6        Scanner sc = new Scanner(System.in);
7
8        // Read radius
9        System.out.print("Enter Radius : ");
10        float r = sc.nextFloat();
11
12        // Calculate Area
13        double circumference = 2 * Math.PI * r;
14
15        // Print area
16        System.out.printf("Circumference of a circle with radius %f is"
17            + " %f \n", r, circumference);
18    }
19}

Output 1 :

1Enter radius : 4 
2Circumference of circle with radius 4.000000 is 25.12

Output 2 :

1Enter radius : 5 
2Circumference of circle with radius 5.000000 is 31.4