import java.util.*; public class Recursion6 { /** * Start of class. Must enter a commandline argument and it Must be an integer */ public static void main(String [] arguments) { if(arguments.length == 0) { System.out.println("ERROR: Enter at least one commandline argument."); } else { /** * gets the commandline input and converts to an integer * plugs into methods for later use */ try { int x; x = Integer.parseInt(arguments[0]); Recursion6.reverse(x); Recursion6.forward(0, x); Integer result = Recursion6.sum(x); System.out.println(x + "! = " + result); Recursion6.twoPower(0, x); System.out.println("\nMethod4 - SUM is " + method4(x)); } //catch statement for string inputed into commandline catch (NumberFormatException e) { System.out.println("you must enter an integer"); } } } //method for printing astericks. //keeps printing until the amount entered into the commandline public static String astericks(String xk) { //convert x to a integer int k = Integer.parseInt(xk); //K is always used for recursion sequence. //X is for the amount entered if(k == 0) return xk; if(k > 0) { k = k - 1; astericks("*" + "*"); } return xk; } //method for printing in reverse order //keeps print ...
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