Programming Tutorial: Calculate Circle Area and Circumference in C, C++, Java, and Python

In this comprehensive coding tutorial, we'll guide you through the process of creating a program to calculate and display the area and circumference of a circle. As we delve into this programming journey, we'll provide implementations in four popular languages: C, C++, Java, and Python.

Problem Statement:

Develop an efficient program that prompts users for the radius of a circle, calculating and presenting both the area and circumference based on the input.

Sample Input/Output:

Sample Input	Sample Output
Enter Circle Radius: 5	Area: 78.54 Circumference: 31.42
Enter Circle Radius: 10	Area: 314.16 Circumference: 62.83

Algorithm:

1. Start

2. Prompt user for the circle radius

3. Read and store the radius value

4. Calculate the area using the formula: Area = π * radius * radius

5. Calculate the circumference using the formula: Circumference = 2 * π * radius

6. Display the calculated area and circumference

7. End

C Programming:

Objective: In this C programming tutorial, we harness the provided radius input to calculate and showcase both the area and circumference of a circle. This implementation ensures precision and efficiency.

#include <stdio.h>

#define PI 3.14159265

// Function to calculate circle properties
void calculateCircleProperties(float radius) {
    float area = PI * radius * radius;
    float circumference = 2 * PI * radius;

    // Display the calculated area and circumference
    printf("Area: %.2f\n", area);
    printf("Circumference: %.2f\n", circumference);
}

// Main program
int main() {
    float radius;

    // Prompt user for circle radius
    printf("Enter Circle Radius: ");
    scanf("%f", &radius);

    // Call the function to calculate and display properties
    calculateCircleProperties(radius);

    return 0;
}

Input/Output:

Enter Circle Radius: 5 Area: 78.54 Circumference: 31.42

C++ Programming:

Objective: In this C++ programming tutorial, we leverage the provided radius to calculate and present the area and circumference of a circle. The implementation emphasizes readability and functionality.

#include <iostream>
#include <cmath>

#define PI 3.14159265

// Function to calculate circle properties
void calculateCircleProperties(float radius) {
    float area = PI * pow(radius, 2);
    float circumference = 2 * PI * radius;

    // Display the calculated area and circumference
    std::cout << "Area: " << area << std::endl;
    std::cout << "Circumference: " << circumference << std::endl;
}

// Main program
int main() {
    float radius;

    // Prompt user for circle radius
    std::cout << "Enter Circle Radius: ";
    std::cin >> radius;

    // Call the function to calculate and display properties
    calculateCircleProperties(radius);

    return 0;
}

Input/Output:

Enter Circle Radius: 10 Area: 314.16 Circumference: 62.83

Java Programming:

Objective: This Java programming tutorial utilizes the input radius to calculate and present both the area and circumference of a circle. The implementation focuses on efficiency and adheres to Java's readability standards.

import java.util.Scanner;

public class CircleProperties {
    final static double PI = 3.14159265;

    // Function to calculate circle properties
    static void calculateCircleProperties(double radius) {
        double area = PI * Math.pow(radius, 2);
        double circumference = 2 * PI * radius;

        // Display the calculated area and circumference
        System.out.println("Area: " + area);
        System.out.println("Circumference: " + circumference);
    }

    // Main program
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        // Prompt user for circle radius
        System.out.print("Enter Circle Radius: ");
        double radius = scanner.nextDouble();

        // Call the function to calculate and display properties
        calculateCircleProperties(radius);
    }
}

Input/Output:

Enter Circle Radius: 7 Area: 153.94 Circumference: 43.98

Python Programming:

Objective: In this Python programming tutorial, we utilize the user-input radius to calculate and showcase both the area and circumference of a circle. The implementation emphasizes simplicity and readability.

import math

# Function to calculate circle properties
def calculateCircleProperties(radius):
    area = math.pi * radius**2
    circumference = 2 * math.pi * radius

    # Display the calculated area and circumference
    print(f"Area: {area:.2f}")
    print(f"Circumference: {circumference:.2f}")

# Main program
if __name__ == "__main__":
    radius = float(input("Enter Circle Radius: "))

    # Call the function to calculate and display properties
    calculateCircleProperties(radius)

Input/Output:

Enter Circle Radius: 8 Area: 201.06 Circumference: 50.27

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