# How can I find the area of a circle in C programming, PHP and C# programming languages?

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Hello Community. I am learning multiples programming languages. I want to find out the area of the circle in C programming, PHP programming, and C# programming languages. How can I get the area of circle these programming languages?

+1 vote

That's a really great idea if you want to compare three programming languages with the same example. If you want to get the area of the circle using C programming, PHP programming, and C# programming, you should understand the area of a circle formula. The mathematics formula for areal of circle - A = π r2

π - Pai

The value of π= 3.14

The area of circle can be written as pai*r*r in C, PHP, and C# programming.

## Find the area of the circle in C programming -

C programming is known as the computer programming language. This is the base of all programming languages. If you want to learn any programming language,

you should understand the C language first .

You can find out the area of the circle in C language by creating variables and multiplication.

#include<stdio.h>

#include<math.h>

main()

{

float r=2.0;

float pai=3.14;

float a;

a = pai*r*r;

printf("Area of circle = %.2f\n", a);

}

Execute the above C language example and change the radius of the circle.

Let's find out the area of the circle in PHP  .

## Area of the circle in PHP programming -

<?php

\$pai=3.14;

\$r=2.0 ;

\$a=\$pai*\$r*\$r;

echo(\$a);

?>

In PHP, variables are declared with the dollar \$ sign.

## Get the area of the circle in C# programming -

C# programming is another programming language based on C and C++ concepts. You can find out the area of a circle using C# language.

public class areaOfCircle{

public static void Main(){

double pai ,a,r;

pai=3.14;

r=2.0;

a=pai*r*r;

System.Console.WriteLine(a);

}

}

by (7.2k points) 5 22 47
edited by

Thanks for the question. The solution is very easy. You should understand the basic things to find out the area of the circle using C, PHP, and C# programming languages.

Area of the circle =  π r

The value of the π = 3.14

r2= r*r;

You need to create three variables .

Follow the best solution reference and change according to your need -

PHP: Add two input box values and sum in the third box

Mathematics operations in C# programming

Area of the circle in C language -

#include<stdio.h>

#include<math.h>

main()

{

float p=3.14;

float area;