📜  求圆面积的程序

📅  最后修改于: 2021-10-23 08:33:29             🧑  作者: Mango

``````Area = pi * r2
where r is radius of circle ``````

##### C++
``````// C++ program to find area
// of circle
#include
const double pi = 3.14159265358979323846;
using namespace std;

// function to calculate the area of circle
float findArea(float r)
{
return (pi * r * r);
}
// driver code
int main()
{
float r, Area;
r = 5;

// function calling
Area = findArea(r);
// displaying the area
cout << "Area of Circle is :" << Area;
return 0;
}``````

##### C
``````// C program to find area
// of circle
#include
#include
#define PI 3.142

double findArea(int r)
{
return PI * pow(r, 2);
}

int main()
{
printf("Area is %f", findArea(5));
return 0;
}``````

##### Java
``````// Java program to find area
// of circle

class Test
{
static final double PI = Math.PI;

static double findArea(int r)
{
return PI * Math.pow(r, 2);
}

// Driver method
public static void main(String[] args)
{
System.out.println("Area is " +  findArea(5));
}
}``````

##### Python3
``````# Python3 program to find Area of a circle

def findArea(r):
PI = 3.142
return PI * (r*r);

# Driver method
print("Area is %.6f" % findArea(5));

# This code is contributed by Chinmoy Lenka``````

##### C#
``````// C# program to find area of circle
using System;

class GFG
{
static double PI = Math.PI;

static double findArea(int r)
{
return PI * Math.Pow(r, 2);
}

// Driver method
static void Main()
{
Console.Write("Area is " + findArea(5));
}
}

// This code is contributed by Sam007.``````

##### Javascript
``````

// Javascript program to find area
// of circle

let pi = 3.14159265358979323846;

// function to calculate the area of circle
function findArea(r)
{
return (pi * r * r);
}

// Driver code
let r, Area;
r = 5;

// function calling
Area = findArea(r);

// displaying the area
document.write("Area of Circle is :" + Area);

// This code is contributed by Mayank Tyagi

``````

``Area is 78.550000``