CALCULATE THE AREA OF A CIRCLE, in all language's code available PYTHON,JAVA,C,CPP

 

CALCULATE THE AREA OF A CIRCLE PYTHON, JAVA, C, CPP

Python code

#Calculate the Area of a Circle:

import math

radius1 = float(input("Enter the radius of the circle: "))

area = math.pi*radius1**2

print("The area of the circle is the :",area)

Output:

Enter the radius of the circle: 5

The area of the circle is : 78.53981633974483

Explanation about the above code clearly explained below:

• The Python code directly assigns values to lower and upper.
• The code uses a for loop with the range function to iterate through each number in the given range.
• The len(str(num)) expression is used to calculate the number of digits in num.
• The code uses ** for exponentiation.
• The output is done using the print function. The end parameter ensures numbers are printed with a comma as a separator.

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Java code

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

        double radius, area;

        Scanner input = new Scanner(System.in);

        System.out.print("Enter the radius value of the circle: ");

        radius = input.nextDouble();

        area = Math.PI * Math.pow(radius, 2);

        System.out.println("The area of the circle is: " + area);

    }

}

Output:

Enter the radius  value of the circle: 5

The area of the circle is: 78.53981633974483

Explanation about the above code clearly explained below:

• import java.util.Scanner;: This line imports the Scanner class from the java.util package to read user input.
• public class Main {: This line is the starting point of the Java program. It declares a public class named "Main".
• public static void main(String[] args) {: This line declares the main method, which is the entry point of the Java program.
• double radius, area;: This declares two double variables, radius and area, to store the user input and calculated area respectively.
• Scanner input = new Scanner(System.in);: This line creates a new instance of the Scanner class to read user input from the console.
• System.out.print("Enter the radius of the circle: ");: This line prints a message asking the user to enter the radius of the circle.
• radius = input.nextDouble();: This line reads the user input for the radius and stores it in the radius variable.
• area = Math.PI * Math.pow(radius, 2);: This line calculates the area of the circle using the Math.PI constant from the Math class and the Math.pow method to calculate the square of the radius.
• System.out.println("The area of the circle is: " + area);: This line prints the calculated area of the circle.
• }: This line indicates the end of the main method.
• }: This line indicates the end of the Main class.

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C code

#include <stdio.h>

#include <math.h>

int main() {

    float radius, area;

    printf("Enter the radius value of the circle: ");

    scanf("%f", &radius);

    area = M_PI * pow(radius, 2);

    printf("The area of the circle is the: %f\n", area);

    return 0;

}

Output:

Enter the radius value of the circle: 5

The area of the circle is the: 78.539818

Explanation about the above code clearly explained below:

• #include <stdio.h>: This line includes the standard input/output library for C programming.
• #include <math.h>: This line includes the math library for mathematical calculations.
• int main() {: This line is the starting point of the C program. It declares the main function.
• float radius, area;: This declares two float variables, radius and area, to store the user input and calculated area respectively.
• printf("Enter the radius of the circle: ");: This line prints a message asking the user to enter the radius of the circle.
• scanf("%f", &radius);: This line reads the user input for the radius and stores it in the radius variable.
• area = M_PI * pow(radius, 2);: This line calculates the area of the circle using the M_PI constant from the math library and the pow function to calculate the square of the radius.
• printf("The area of the circle is: %f\n", area);: This line prints the calculated area of the circle.
• return 0;: This line indicates the end of the main function and returns 0, indicating successful execution of the program.

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C++ code

#include <iostream>

#include <cmath>

int main() {

    float radius, area;

    std::cout << "Enter the radius of the circle: ";

    std::cin >> radius;

    area = M_PI * pow(radius, 2);

    std::cout << "The area of the circle is: " << area << std::endl;

    return 0;

}

Output:

Enter the radius of the circle: 5

The area of the circle is: 78.5398

Explanation about the above code clearly explained below:

• #include <iostream>: This line includes the input/output stream library for C++ programming.
• #include <cmath>: This line includes the cmath library for mathematical calculations.
• int main() {: This line is the starting point of the C++ program. It declares the main function.
• float radius, area;: This declares two float variables, radius and area, to store the user input and calculated area respectively.
• std::cout << "Enter the radius of the circle: ";: This line prints a message asking the user to enter the radius of the circle.
• std::cin >> radius;: This line reads the user input for the radius and stores it in the radius variable.
• area = M_PI * pow(radius, 2);: This line calculates the area of the circle using the M_PI constant from the cmath library and the pow function to calculate the square of the radius.
• std::cout << "The area of the circle is: " << area << std::endl;: This line prints the calculated area of the circle.
• return 0;: This line indicates the end of the main function and returns 0, indicating successful execution of the program.

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