Primitive operators

Question

During your math class, you are given a task to calculate the perimeter of a circle.
You decide to write a small program that will take the radius as input, and will calculate and print the perimeter for you.
The value for π (pi) is already defined.

Sample Input
4

Sample Output
25.12
https://code.sololearn.com/ckpsyjMMHtmU/?ref=app

Answer 1

//try this

import java.util.Scanner;

public class Main {

public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
double pi = 3.14;
int radius = scanner.nextInt();
System.out.println(2*pi*radius);

}
}

Answer 2

Perimeter of a circle means circumference.
C = 2πr

You need to declare radius as an input variable instead of giving direct values.

int radius=new Scanner(System.in).nextInt();

Answer 3

Formula is 3.14*radius*2
Change the last line to System.out.println(area);

Answer 4

import java.util.Scanner;

public class Main {

public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
double pi = 3.14;
double r=scanner.nextInt();
//your code goes here

double area=pi*r*r2
System.out.println (area);

}
}

//Modified your code just check

Answer 5

import java. util.*;
public class Program
{
public static void main(String[] args) {
int radius=new Scanner(System.in).nextInt();
int area=3.14*radius*2;
System.out.println (area) ;
}
}

//Try this

Answer 6

Somvardhan Shiva sorry I thought that you are checking for area as you have made a variable area
Formula is 2*3.14*r

Answer 7

Ask question only.

Answer 8

Ok

Answer 9

Ok, tell me what is the formula for finding the area of circle

Answer 10

Scanner scanner = new Scanner(System.in);
double pi = 3.14;
int radius = 4;
double area = 2*3.14*4;

//your code goes here

Systemy.out.println (area);

}
}

Answer 11

Sorry guys its not working

Answer 12

import java.util.Scanner;

public class Main {

public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
double pi = 3.14;
int radius = scanner.nextInt();
System.out.println(2*pi*radius);

}
}

Good Luck