C# program to find the area of a circle :
In this post, we will learn how to find the area of a circle in C sharp. We will take the radius as input from the user and calculate the area. With this program, you will learn how to take user inputs in C sharp and how to do mathematical calculations.
Formula to find the area of a circle:
Below formula is used to calculate the circle area:
π * r * rWhere, r is the radius and π is the mathematical constant Pi. We will take the value of radius from the user as input. For π, we can either define a variable and assign it upto a specific decimal place or we can use Math.PI constant that is available in C#.
C# program:
Below is the complete program to calculate circle area in C#:
using System;
public class Program
{
public static void Main()
{
int radius;
double area;
Console.WriteLine("Enter the value of radius: ");
radius = int.Parse(Console.ReadLine());
area = Math.PI * radius * radius;
Console.WriteLine("Area of the circle is : "+ Math.Round(area,2));
}
}Explanation:
- radius is an int value to keep the radius of the circle.
- area is a double to save the area of the circle.
- We are using int.Parse to parse the user input number i.e. the radius.
- The final area is stored in the double area
- Finally, we are writing down the area of the triangle.
Sample output:
Enter the value of radius:
10
Area of the circle is :314.16