Description

To calculate area follow the formula of pi*radius*radius.
Here assume pi=3.14.

C/C++

/* C Prgram to calculate area of circle */
//Save it as AreaCircle.c

#include<stdio.h>
int main(){

    float radius, area;

    printf("Enter the radius of circle : ");
    scanf("%f",&radius);

    area = 3.14 * radius * radius;

    printf("The area of circle : %.2f", area);

    return 0;
}

Input:
Enter the radius of circle : 7

Output:
The area of circle : 153.86

Java

/* Java Prgram to calculate area of circle */
//Save it as AreaCircle.java


import java.io.*;
import java.util.Scanner;

public class AreaCircle {

    public static void main(String[] args) {
        
        Scanner scanner = new Scanner(System.in);
        
        float radius, area;
        
        System.out.println("Enter the radius of circle : ");
        radius = scanner.nextFloat();
        
        area = (float) (3.14 * radius * radius);
        
        System.out.println("The area of circle : "+ area);
        
    }
}

Input:
Enter the radius of circle : 
7

Output:
The area of circle : 153.86

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