What am I doing wrong? Java IllegalFormatConversionException

Question

I have some code for calculating properties of a circle:

package circleinfo;

import java.util.Scanner;

public class Circleinfo {

    public static void ma         


        

Answer 1

(r*2) will be an int and not a float as r is int and 2 is int. Use %d instead

%c          char    Character
%d          int         Signed decimal integer.  
%e, %E      float       Real number, scientific notation (lowercase or uppercase exponent marker)
%f         float    Real number, standard notation.