求圆柱的周长

给定直径和高度，求圆柱的周长。
周长是二维形状轮廓的长度。圆柱体是三维形状。因此，从技术上讲，我们无法找到圆柱体的周长，但我们可以找到圆柱体横截面的周长。这可以通过在其底部创建投影来完成，因此，在其侧面创建投影，然后形状将减少为矩形。

公式 ：
圆柱周长 ( P ) = $( 2 * d ) + ( 2 * h )$
这里 d 是圆柱体的直径
h 是圆柱体的高度
例子 ：

Input : diameter = 5, height = 10 
Output : Perimeter = 30

Input : diameter = 50, height = 150 
Output : Perimeter = 400

C++

// CPP program to find
// perimeter of cylinder
#include 
using namespace std;
 
// Function to calculate perimeter
int perimeter(int diameter, int height)
{
    return 2 * (diameter + height);
}
 
// Driver function
int main()
{
    int diameter = 5;
    int height = 10;
     
    cout << "Perimeter = ";
    cout<< perimeter(diameter, height);
    cout<<" units\n";
     
    return 0;
}

Java

// Java program to find
// perimeter of cylinder
import java.io.*;
 
class GFG {
 
    // Function to calculate perimeter
    static int perimeter(int diameter, int height)
    {
        return 2 * (diameter + height);
    }
     
    /* Driver program to test above function */
    public static void main(String[] args)
    {
        int diameter = 5;
        int height = 10;
        System.out.println("Perimeter = " +
                         perimeter(diameter, height)
                                       + " units\n");
    }
}
 
// This code is contributed by Gitanjali.

Python

# Function to calculate
# the perimeter of a cylinder
def perimeter( diameter, height ) :
    return 2 * ( diameter + height )
 
# Driver function
diameter = 5 ;
height = 10 ;
print ("Perimeter = ",
            perimeter(diameter, height))

C#

// C# program to find perimeter of cylinder
using System;
 
class GFG {
 
    // Function to calculate perimeter
    static int perimeter(int diameter, int height)
    {
        return 2 * (diameter + height);
    }
     
    /* Driver program to test above function */
    public static void Main(String[] args)
    {
        int diameter = 5;
        int height = 10;
        Console.Write("Perimeter = " +
                       perimeter(diameter, height)
                                    + " units\n");
    }
}
 
// This code is contributed by parashar...

Javascript

 
// javascript program to find
// perimeter of cylinder
 
// Function to calculate perimeter
    function perimeter(diameter, height)
    {
        return 2 * (diameter + height);
    }
 
// Driver Function
 
         let diameter = 5;
        let height = 10;
        document.write("Perimeter = " +
                         perimeter(diameter, height)
                                       + " units\n");
     
    // This code is contributed by susmitakundugoaldanga.

输出 ：

Perimeter = 30 units