Program to find diameter with the given radius of a circle.

Last Updated : 29 Jan, 2024

Given the radius of a circle, write a program to find the diameter of a circle.

Examples:

Input: r=4
Output: 8

Input: r=5
Output:10

Approach:

The diameter of a circle is simply twice the radius.

Here’s how you could express this formula in a mathematical sense:

D= 2* r
r is radius and D is diameter of a circle

Below is the implementation of the code:

C++

 #include using namespace std;   int main() {       int radius = 4, diameter;       // Get user input for the radius     cout << "The Given radius of the circle is: " << radius          << endl;       // Calculate the diameter using the formula: diameter =     // 2 * radius     diameter = 2 * radius;       // Display the result     cout << "The diameter of the circle is : " << diameter          << endl;       return 0; }

Java

 import java.util.Scanner;   public class CircleDiameter {     public static void main(String[] args) {         Scanner scanner = new Scanner(System.in);           int radius = 4;         int diameter;           // Display the given radius of the circle         System.out.println("The Given radius of the circle is: " + radius);           // Calculate the diameter using the formula: diameter = 2 * radius         diameter = 2 * radius;           // Display the result         System.out.println("The diameter of the circle is: " + diameter);           scanner.close();     } }

Python3

 # Get the radius of the circle radius = 4   # Display the given radius of the circle print("The Given radius of the circle is:", radius)   # Calculate the diameter using the formula: diameter = 2 * radius diameter = 2 * radius   # Display the result print("The diameter of the circle is:", diameter)

C#

 using System;   public class GFG {       static public void Main()     {         int radius = 4, diameter;           // Get user input for the radius         Console.WriteLine(             "The Given radius of the circle is: " + radius);           // Calculate the diameter using the formula:         // diameter = 2 * radius         diameter = 2 * radius;           // Display the result         Console.WriteLine("The diameter of the circle is : "                           + diameter);     } }

Javascript

 let radius = 4; let diameter;   // Display the given radius // of the circle console.log("The Given radius of the circle is: " + radius);   // Calculate the diameter using // the formula: diameter = 2 * radius diameter = 2 * radius;   // Display the calculated diameter console.log("The diameter of the circle is : " + diameter);

Output

The Given radius of the circle is: 4
The diameter of the circle is : 8

Time Complexity: O(1), since there is one multiplication operation which takes constant time.
Auxiliary Space: O(1), since no extra space has been taken.

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