Eager to Code, Enjoy to Debug ~ Embark into Each Stage with Your Heart

/* Exercise 7.13
* 1. Use enhanced for statement
* 2. Sum the double values passed by the command-line arguments.
* 3. Use the static method parseDouble of class Double to convert a String to a double value.
*/
package Exercises;
public class SumDouble {
public static void main(String []args)
{
// get array size from first command-line-argument
int arrayLength = Integer.parseInt(args[0]);
int array[] = [...]

/* Exercise 7.12
* 1. Size of the array specified by the first command-line argument.
* 2. If no command-line argument is supplied, use 10 as the default size of the array.
*/
package Exercises;
public class SizeOfArray {
public static void main(String[] args) {
// check existence of command-line arguments
if (args.length == 0)
// set default size of array to 10
int array[] [...]

/* Exercise 7.11
* 1. Calculates the product of a series of integers
* 2. Passed to method product using a variable-length argument list.
* 3. Test the method with several calls, each with a different number of arguments.
*/
package Exercises;
public class CalculateProduct {
// calculate the product
public static int product(int… numbers) {
int product = 1;
// multiply the series of [...]