Home / C# / Geometry / C# Program to Calculate Diameter, Area and Perimeter of a Circle

C# Program to Calculate Diameter, Area and Perimeter of a Circle

in ,
Area, Perimeter of Circle

C# program to calculate diameter, area and perimeter of a circle has been given below. Suppose, the radius of a circle is r unit, the area and perimeter of that circle would be (pi * r^2) unit^2 and (2 * pi * r) unit, respectively while the diameter would be 2 * r. The approximate value of pi is 3.141592.


For example, if the radius of a circle is 5 cm, then area of the circle would be (pi * 5^2) = 78.54 cm^2 while perimeter and diamerter would be (2 * pi * r) = 31.42 cm and (2 * r) = 10 cm respectively.


The algorithm, pseudocode, and time-complexity of the program have also been covered below.





1. Algorithm to calculate diameter, area and perimeter of a circle


1. Take the radius r of a circle as input.

2. Compute d = 2 * r

3. Compute a = pi * r^2

4. Compute p = 2 * pi * r

5. Declare d as the diameter, a as the area and p as the perimeter of that circle.




2. Pseudocode to calculate diameter, area and perimeter of a circle


Input : Radius r of a circle

Output : Diameter D, Area A, Perimeter P of the circle

1. Procedure diameterAreaPerimeter(r):

2. D := 2 * r

3. A := pi * r^2

4. P := 2 * pi * r

5. Return D, A, P

6. End Procedure





3. Time complexity to calculate diameter, area and perimeter of a circle


Time Complexity: O(1)




4. C# Program & Output to calculate diameter, area and perimeter of a circle

Code has been copied
/*************************************
	  alphabetacoder.com
C# program to calculate the area, 
perimeter and diameter of a circle
**************************************/

using System;

namespace AreaPerimeterDiameter {
    class Program {
        static void Main(string[] args) {
            // declare variables
            double r, a, p, d;

            // take input
            Console.Write("Enter the radius of a circle: ");
            r = Convert.ToDouble(Console.ReadLine());

            // calculate area
            a = Math.PI * r * r;
            // calculate perimeter
            p = 2 * Math.PI * r;
            // calculate diameter
            d = 2 * r;

            // display result upto 3 decimal places
            Console.Write("Area: " + string.Format("{0:0.000}", a) + "\n");
            Console.Write("Perimeter: " + string.Format("{0:0.000}", p) + "\n");
            Console.Write("Diameter: " + string.Format("{0:0.000}", d) + "\n");

            // wait for user to press any key
            Console.ReadKey();
        }
    }
}

Output

Enter the radius of a circle: 6.5

Area: 113.097

Perimeter: 40.841

Diameter: 13.000





Labels: ,