a. Complete the missing parts in the code. mport java.util. Scanner; iblic class Rowers public static void main (string() args) Scanncr in - row Scannce (Syeterm. In)? System.out. print ("Please enter a number: "i; double number = in. nextDouble (i): 3 double square = number number; / /Print the result of squaring //calculate the cube of the number System.out.printf ("cube: ifln", qube); Ifcalculate the fourth power lif the number /print the result b. Perform the above tasks with methods called calc_cube and calc fourth with the first method taking the original number as an argument and the second one taking the result of the calculation result of the calc_cube method and the original number itself as arguments. (type: double) Return the respective calculated values from above methods and print them (type: double)